A Favorable Environment for Severe Thunderstorms

The animation on the left (Figure 1) denotes an unseasonably strong 500 mb trough associated with unseasonably strong jet energy. Note the core of 70-80 kts winds (denoted by the "J") advancing north toward the western Great Lakes region during the afternoon of Tuesday May 21. This strong upper-level energy set the stage for a widespread severe weather outbreak.	Figure 1 - HREF 500mb Mean Winds (shaded) and Heights (contours)
The upper-level energy led to the formation of a seasonably strong surface low pressure system over the central Plains (Figure 2).  The surface low (and associated cold front) deepened as it moved northeast to western Lake Superior by late Tuesday evening.	Figure 2 - RAP Mean Sea Level Pressure (MSLP). Surface low center denoted by the "L" in the animation.
The GOES-16 mid-level water vapor animation (Figure 3) nicely depicts the evolution of the storm system over the central CONUS during the day on Tuesday.  Note the vigorous short wave impulse (denoted by the "X") ejecting northeast out of the Central Plains toward the western Great Lakes followed by rapid development of deep convection just ahead of it over Iowa.  Note how the convection quickly expands southward along the cold front sweeping across the Southern Plains.	Figure 3 - GOES-16 Water Vapor with Lightning Flashes. "X" denotes the vigorous upper-level impulse that helped to initiate the severe convection.
As the surface low deepened and advanced northeast toward the western Great Lakes Tuesday afternoon, a very unstable airmass was quickly transported northward into the northern Mississippi Valley and upper Midwest by late afternoon (Figure 4). More importantly, the strong instability was collocated with very strong deep layer wind shear.  This was especially the case over the state of Iowa. Note in Figure 4 that the greatest surface-based instability (> 3000 J/Kg) was co-located with very strong wind shear over southwest Iowa by early afternoon.  This combination of strong shear and high instability lead to the rapid formation of deadly discrete tornadic supercells (Figure 5) over Iowa ahead of an advancing cold front.	Figure 4 - HREF Mean Deep Layer Shear Vectors and Surface-Based Instability (shaded).
Also note in Figure 4 that the instablity was noticeably lower over central and northeast Wisconsin (500-750 J/kg) later in the day. However, given the strong upper-level jet energy, lift associated with the advancing cold front and strong deep layer shear that was spreading over the area, the available instability was more than adequate to generate a couple bands of quasilinear severe convection.	Figure 5 - GOES-16 Enhanced Visible Imagery (Day Cloud Phase Distinction) denoting rapid development of tornadic supercell storms over Iowa. GOES-16 lightning data is overlaid on the imagery.
Figure 6 is another enhanced GOES-16 satellite animation showing the large bands of quasilinear severe convection as it was approaching central Wisconsin around 7 pm.               For more information on the radar evolution of these storms that produced widespread straight-line winds in addition to a few embedded tornadoes, refer to the "Tornado Listing" tab.	Figure 6 - GOES-16 Enhanced Imagery (Sandwich).

Tornado Listing

Unity - Marathon County   Date May 21, 2024 Time (Local) 7:34 pm - 7:37 pm EF Rating 1 Est. Peak Winds 105 mph Path Length 4.23 mi Max Width 65 yds Injuries/Deaths None Summary:  The tornado developed just southwest of the Village of Unity in Clark County, Wisconsin. The tornado produced damage in the western portion of Unity before crossing Highway 13 into Marathon County while producing additional damage in the northeast side of Unity, including damage to an outbuilding along County Highway P. The tornado continued to produce scattered tree damage as it tracked northeast across Chokecherry Road and Juneberry Road. The tornado lifted near Mulberry Road with straight-line winds continuing northeast to County Road N just southeast of Colby. See survey results from NWS La Crosse for more details on the Clark County side of the track.     Track Map

Fenwood - Marathon County   Date May 21, 2024 Time (Local) 7:47 pm - 7:50 pm EF Rating 1 Est. Peak Winds 87 mph Path Length 2.11 mi Max Width 60 yds Injuries/Deaths None Summary:  N/A       Track Map

Kaukauna - Outagamie County   Date May 21, 2024 Time (Local) 8:58 pm - 9:01 pm EF Rating 1 Est. Peak Winds 100 mph Path Length 2.69 mi Max Width 80 yds Injuries/Deaths None Summary:  A tornado developed near Buchanan Road, southwest of the Village of Kaukauna, snapping trees and producing structural damage to the garages of a couple homes. The tornado quickly tracked northeast, snapping more large branches and uprooting trees. Just before the tornado crossed the Fox River, it produced structural damage to the roof of an apartment building along Bicentennial Court. A large healthy tree was snapped at this location as well. The tornado continued to produce damage on the northern side of Kaukauna after crossing the river.     The radar animation (left) shows the evolution of two organized lines of storms.  The left panel is reflectivity and on the right is doppler base velocity. The green and blue colors indicated radial velocities toward the radar (KGRB). The darker the blue, the stronger the inbound radial velocities.  Organized thunderstorm outflow from both lines can clearly be seen surging toward Green Bay and The Fox Valley. Scattered straight line wind damage occurred along these surging storm outflow boundaries. Under certain conditions, shallow, brief and transient tornadoes (usually weak EF0 or EF1 intensity) may also quickly develop near the leading edge of the organized thunderstorm outflows (denoted by the arrows on the last image). These type of tornadoes (referred to as meso-vortex tornadoes) are usually embedded within broader regions of the storm producing straight-line wind damage. The brief tornado the struck the Kaukauna area is an excellent example of one of these tornadic circulations. The tornadic circulation is denoted by the red circle at the end of the animation (above). The 4-panel (left) is a radar snapshot of the Kaukauna Tornado.   Note that although the reflectivity data (top-left) does not indicate anything unusual, we see a small circulation in the velocity data (lower right). The radar was also able to detect a small debris signature (lower-left). Note that the tornadic debris signature (TDS) typically is not sampled by the radar until a few minutes after the tornado has touched down.  Also, it is important to note that the TDS may persist several minutes after the tornado has dissipated.  This is because the smaller debris lofted by the tornado can remain suspended a few thousand feet above the ground for several more minutes  as it's advected further downstream by strong upper-level winds.   Track Map

EF0 Weak 65-85 mph	EF1 Moderate 86-110 mph	EF2 Significant 111-135 mph	EF3 Severe 136-165 mph	EF4 Extreme 166-200 mph	EF5 Catastrophic 200+ mph

Storm Reports

Storm Reports on May 21, 2024

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE GREEN BAY WI
157 AM CDT Wed May 22 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0736 PM     Tornado          Unity                   44.85N 90.31W
05/21/2024                   Marathon           WI   NWS Storm Survey

            NWS survey team conducted damage survey on
            5/22/24 and confirmed an EF1 tornado that
            impacted Unity, Wisconsin along the Clark
            and Marathon county line. Wind speeds were
            estimated at 105 mph. Time estimated from
            radar when tornado crossed into Marathon
            County. More details to follow.

0737 PM     Tstm Wnd Gst     Marshfield Municipal Ai 44.64N 90.19W
05/21/2024  M70 MPH          Wood               WI   ASOS

0739 PM     Tstm Wnd Dmg     4 WNW Bakerville        44.66N 90.28W
05/21/2024                   Wood               WI   Trained Spotter

            Marshfield area. Trees down at Eagle Road
            and County H.

0739 PM     Tstm Wnd Dmg     3 NNW Bakerville        44.66N 90.23W
05/21/2024                   Wood               WI   Trained Spotter

            Trees down in Marshfield. Wren and Robin
            roads partially blocked.

0745 PM     Tstm Wnd Gst     2 SSW Stratford         44.76N 90.10W
05/21/2024  M58 MPH          Marathon           WI   Mesonet

            Measured at the Marshfield Wisconet station.

0747 PM     Tornado          2 W Fenwood             44.86N 90.05W
05/21/2024                   Marathon           WI   NWS Storm Survey 

            NWS Green Bay Damage Survey, with 
            coordination from Marathon County Emergency 
            Management, found an EF-1 tornado that 
            started at this location and went NE for 
            2.11 miles. Estimated Peak Wind was 87 mph. 
            Delayed Report. 

0751 PM     Tornado          4 WSW Poniatowski       44.95N 90.05W
05/21/2024                   Marathon           WI   NWS Storm Survey 

            NWS Green Bay Damage Survey, with 
            coordination from Marathon County Emergency 
            Management, found an EF-1 tornado that 
            started at this location and went NE for 
            2.13 miles. Estimated Peak Wind was 92 mph. 
            Delayed Report. 

0757 PM     Tstm Wnd Gst     Wisconsin Rapids Airpor 44.36N 89.84W
05/21/2024  M63 MPH          Wood               WI   ASOS

            Reported at KISW - Alexander Field South
            Wood County Airport.

0800 PM     Tstm Wnd Dmg     Stratford               44.79N 90.08W
05/21/2024                   Marathon           WI   Public

            Trees down.

0807 PM     Tstm Wnd Gst     Wausau Downtown Airport 44.93N 89.63W
05/21/2024  M60 MPH          Marathon           WI   Public

0809 PM     Tstm Wnd Dmg     5 SW Whiting            44.44N 89.65W
05/21/2024                   Portage            WI   Trained Spotter

            Street signs bent over at the intersection
            of highways 54 and F to west of Plover.

0814 PM     Tstm Wnd Dmg     Merrill                 45.18N 89.68W
05/21/2024                   Lincoln            WI   911 Call Center

            Multiple reports of trees and wires down
            across the Merrill area. Time based on
            radar.

0830 PM     Tstm Wnd Dmg     1 SE Harrison           45.47N 89.48W
05/21/2024                   Lincoln            WI   911 Call Center

            Trees and wires down near Harrison. Time
            based on radar.

0830 PM     Tstm Wnd Dmg     7 W Deerbrook           45.23N 89.31W
05/21/2024                   Langlade           WI   911 Call Center

            Trees down in Township of Vilas.

0848 PM     Tstm Wnd Dmg     3 W Monico              45.58N 89.17W
05/21/2024                   Oneida             WI   911 Call Center

            Trees down at the intersection of highways 8
            and 45 in the Town of Monico. Time estimated
            from radar.

0850 PM     Tstm Wnd Dmg     2 NE Medina             44.28N 88.59W
05/21/2024                   Outagamie          WI   Public

            Heavy downfall, severe bending of trees,
            winds of 60+ (estimated).

0850 PM     Tstm Wnd Dmg     Kaukauna                44.28N 88.27W
05/21/2024                   Outagamie          WI   Trained Spotter

            Spotter reported several trees down in the
            City of Kaukauna with lose of power. Spotter
            estimated wind gusts reached 70 mph as
            storms moved through.

0855 PM     Rain             2 SSW Plover            44.43N 89.55W
05/21/2024  M2.11 Inch       Portage            WI   Trained Spotter

0857 PM     Tornado          1 SE Kimberly           44.27N 88.29W
05/21/2024                   Outagamie          WI   NWS Storm Survey

            EF-1 Tornado confirmed in the Village of
            Kaukauna. 95 mph max wind speeds. 5/21/24
            857 pm to 901 pm. Separate damage surveys
            conducted by NWS employees on 5/21/24 and
            5/22/24. Scattered tree damage along path of
            tornado. Structure damage to outbuildings
            along Buchanan Road and an apartment
            building along Bicentennial Court.

0857 PM     Tstm Wnd Gst     Clintonville            44.62N 88.76W
05/21/2024  E70 MPH          Waupaca            WI   Trained Spotter

            Trained spotter reported estimated wind
            gusts of 70 mph as well as rainfall rates of
            over 1 inch per hour and frequent cloud to
            ground lightning.

0902 PM     Tstm Wnd Dmg     Kaukauna                44.26N 88.26W
05/21/2024                   Outagamie          WI   Emergency Mngr

            Trees and wires down in Kaukauna and Little
            Chute. Semi tipped over in Kaukauna. Time
            based on radar.

0906 PM     Tstm Wnd Dmg     2 E Park Ridge          44.52N 89.50W
05/21/2024                   Portage            WI   Trained Spotter

            Trained spotter reported trees down on Old
            Highway 18 east of Sevens Point. Road is
            impassable.

0917 PM     Tstm Wnd Gst     2 WNW Ashwaubenon       44.50N 88.11W
05/21/2024  M56 MPH          Brown              WI   NWS Employee

            At NWS Green Bay.

0920 PM     Tstm Wnd Dmg     1 N Ashwaubenon         44.50N 88.07W
05/21/2024                   Brown              WI   Law Enforcement

            Multiple reports of wires down. Report of
            tree through roof.

0924 PM     Tstm Wnd Gst     2 WNW Howard            44.57N 88.10W
05/21/2024  M68 MPH          Brown              WI   Public           

            Delayed report. 

0925 PM     Tstm Wnd Dmg     2 NNE Ashwaubenon       44.51N 88.06W
05/21/2024                   Brown              WI   Trained Spotter

            Large branches down and power out.

0941 PM     Tstm Wnd Dmg     2 SSW Howard            44.53N 88.08W
05/21/2024                   Brown              WI   Trained Spotter

            A lot of tree limbs down covering S Taylor
            Road in Green Bay.

0945 PM     Tstm Wnd Dmg     Green Bay               44.51N 88.01W
05/21/2024                   Brown              WI   Law Enforcement

            Multiple reports of trees and powerlines
            down across the City of Green Bay.

0953 PM     Tstm Wnd Gst     Marinette               45.10N 87.63W
05/21/2024  E70 MPH          Marinette          WI   Trained Spotter

            Trained spotter reported 70 mph winds as
            well as downed trees and lose of power.

0955 PM     Marine Tstm Wind 2 WSW Oconto            44.87N 87.92W
05/21/2024  M43 MPH          Oconto             WI   AWOS

            AWOS station KOCQ Oconto Airport.

0955 PM     Marine Tstm Wind 1 SSW Sturgeon Bay      44.83N 87.38W
05/21/2024  M44 MPH          Door               WI   ASOS

0958 PM     Tstm Wnd Dmg     Sturgeon Bay            44.83N 87.37W
05/21/2024                   Door               WI   Amateur Radio

            Tree down blocking road between Oregon St.
            and 7th Ave. Time based on radar.

1000 PM     Marine Tstm Wind 9 ENE Peshtigo          45.09N 87.59W
05/21/2024  M58 MPH          LMZ521             WI   C-Man Station

            Menominee marine observation. MNMM4.

1001 PM     Marine Tstm Wind 10 ENE Peshtigo         45.11N 87.56W
05/21/2024  M45 MPH          LMZ521             WI   ASOS

1003 PM     Rain             6 E Knowlton            44.69N 89.55W
05/21/2024  M2.20 Inch       Marathon           WI   Public

            Total since this morning.

1005 PM     Tstm Wnd Dmg     2 W Egg Harbor          45.04N 87.31W
05/21/2024                   Door               WI   Amateur Radio

            Tree down blocking Bay Shore Drive near
            Horseshoe Bay. Time estimated based on
            radar.

1008 PM     Tstm Wnd Dmg     3 S Institute           44.85N 87.30W
05/21/2024                   Door               WI   911 Call Center

            Tree down in Sevastopol.

1010 PM     Tstm Wnd Dmg     Egg Harbor              45.04N 87.28W
05/21/2024                   Door               WI   911 Call Center

            Trees and wires down.

1011 PM     Tstm Wnd Dmg     Fish Creek              45.13N 87.23W
05/21/2024                   Door               WI   911 Call Center

            Trees down.

1035 PM     Tstm Wnd Dmg     2 SSW Washington Island 45.36N 86.92W
05/21/2024                   Door               WI   Amateur Radio

            Trees down with home damage. Multiple
            additional trees with roads blocked in the
            area.

1032 PM     Tornado          2 SSW Washington Island 45.35N 86.91W
05/21/2024                   Door               WI   NWS Storm Survey 

            NWS Green Bay Damage Survey, with 
            coordination from Door County Emergency 
            Management, found an EF-1 tornado that 
            started at this location and went NE for 
            2.28 miles. Estimated Peak Wind was 90 mph. 
            Delayed Report. 

1035 PM     Tstm Wnd Dmg     2 SW Washington Island  45.36N 86.93W
05/21/2024                   Door               WI   Amateur Radio

            Multiple trees and wires down across
            Washington Island. Officials are starting to
            clear roads.

Rainfall

Public Information Statement
National Weather Service Green Bay WI
1028 AM CDT Wed May 22 2024

...24 HR PRECIPITATION REPORTS...

Location                     Amount    Time/Date       Lat/Lon/Elev (ft.) 

...Wisconsin...

...Brown County...
Denmark WWTP                 1.41 in   0800 AM 05/22   44.35N/87.81W/819    
Denmark                      1.16 in   0950 AM 05/22   44.39N/87.86W/859    
Denmark 1 NNE                1.03 in   0950 AM 05/22   44.35N/87.83W/866    
Green Bay 2.9 SSE            0.93 in   0700 AM 05/22   44.48N/87.96W/659    
Wrightstown                  0.88 in   0945 AM 05/22   44.33N/88.17W/652    
Wrightstown 0.4 ENE          0.84 in   0700 AM 05/22   44.33N/88.17W/652    
De Pere 2.0 ESE              0.80 in   0800 AM 05/22   44.43N/88.03W/601    
De Pere                      0.77 in   0945 AM 05/22   44.37N/88.07W/721    
Green Bay                    0.75 in   0945 AM 05/22   44.51N/88.01W/594    
De Pere 2.1 E                0.66 in   0700 AM 05/22   44.44N/88.03W        
Green Bay 1 ESE              0.64 in   0945 AM 05/22   44.50N/87.98W/597    
NWS Green Bay                0.64 in   0700 AM 05/22   44.50N/88.11W/676    
Champion 1 NNW               0.61 in   0700 AM 05/22   44.61N/87.81W/758    
Green Bay 4.4 SSW            0.60 in   0700 AM 05/22   44.46N/88.02W/609    
Suamico 4.4 WNW              0.55 in   0730 AM 05/22   44.66N/88.12W/691    
Green Bay Botanical Garden   0.54 in   0700 AM 05/22   44.53N/88.10W/890        
De Pere                      0.43 in   0950 AM 05/22   44.44N/88.05W/643    
Green Bay 7.1 WNW            0.42 in   0700 AM 05/22   44.57N/88.12W/702    
Howard 1.7 SSW               0.42 in   0700 AM 05/22   44.55N/88.09W        
Green Bay Airport            0.42 in   0916 AM 05/22   44.48N/88.13W/686        

...Calumet County...
Chilton 1 W                  1.87 in   0949 AM 05/22   44.03N/88.17W/876    
Chilton 0.5 E                1.80 in   0700 AM 05/22   44.03N/88.15W/840    
Hilbert 5.9 WSW              1.45 in   0451 AM 05/22   44.11N/88.27W/941    
Brillion 4.9 S               1.34 in   0700 AM 05/22   44.11N/88.05W/831    
Brillion                     1.30 in   0923 AM 05/22   44.18N/88.07W/810    
New Holstein 1 W             0.93 in   0950 AM 05/22   43.95N/88.10W/994    
Forest Junction              0.90 in   0950 AM 05/22   44.21N/88.21W/833    
Darboy 3 SE                  0.86 in   0700 AM 05/22   44.20N/88.33W/791    
Menasha 2.4 E                0.69 in   0700 AM 05/22   44.21N/88.39W/797    
Menasha 2.7 ENE              0.62 in   0550 AM 05/22   44.22N/88.38W/799    

...Door County...
Forestville 4 E              0.89 in   0700 AM 05/22   44.70N/87.40W/694    
Potawatomi State Park 3 SE   0.84 in   0945 AM 05/22   44.83N/87.40W/696    
Sturgeon Bay Exp Farm        0.72 in   0730 AM 05/22   44.87N/87.33W/660    
Egg Harbor 3.7 SSE           0.68 in   0800 AM 05/22   45.00N/87.26W        
Fish Creek 1 E WWTP          0.62 in   0430 AM 05/22   45.12N/87.23W/646    
Washington Island 1 WSW      0.61 in   0950 AM 05/22   45.36N/86.93W/588    
Egg Harbor 4.6 SW            0.58 in   0700 AM 05/22   44.99N/87.35W/763    
Baileys Harbor 4.3 N         0.58 in   0800 AM 05/22   45.13N/87.14W        
Potawatomi State Park 4 ESE  0.56 in   0949 AM 05/22   44.83N/87.36W/643    
Baileys Harbor 3.4 NE        0.56 in   0440 AM 05/22   45.10N/87.08W/639    
Ephraim 1 NE - WWTP          0.51 in   0840 AM 05/22   45.17N/87.15W/728    
Sister Bay 1 N               0.46 in   0600 AM 05/22   45.20N/87.11W/700    
Ellison Bay 3.6 NE           0.43 in   0630 AM 05/22   45.29N/87.02W/594    
Ephraim Airport              0.39 in   0935 AM 05/22   45.13N/87.18W/747    
Carlsville 1.9 NW            0.37 in   0630 AM 05/22   44.97N/87.36W/768    

...Florence County...
Florence                     1.83 in   0700 AM 05/22   45.93N/88.26W/1305   
Spread Eagle 1 NW            1.65 in   0700 AM 05/22   45.89N/88.14W/1216   
Praws 8                      1.44 in   0935 AM 05/22   45.76N/88.60W/1539   

...Forest County...
Wabeno 2 NNW                 1.83 in   0930 AM 05/22   45.46N/88.68W/1560   
Argonne 1.5 NW               1.61 in   0711 AM 05/22   45.67N/88.90W/1673   
Crandon                      1.52 in   0950 AM 05/22   45.52N/88.85W/1650   

...Kewaunee County...
Kewaunee                     1.10 in   0645 AM 05/22   44.46N/87.50W/592    
Luxemburg 0.9 S              1.02 in   0538 AM 05/22   44.53N/87.71W        
Luxemburg 5.9 S              1.00 in   0700 AM 05/22   44.46N/87.72W        
Casco 0.4 NNW                0.88 in   0516 AM 05/22   44.56N/87.62W/749    
Dyckesville 2 SSE            0.76 in   0716 AM 05/22   44.61N/87.74W        
Rankin 2 E                   0.75 in   0950 AM 05/22   44.60N/87.44W/604    

...Langlade County...
White Lake 1.4 SE            1.96 in   0800 AM 05/22   45.15N/88.74W/1289   
Antigo 1 SSW                 1.93 in   0800 AM 05/22   45.13N/89.15W/1450   
Antigo 2 ENE                 1.90 in   0905 AM 05/22   45.16N/89.11W/1499   
Antigo Airport               1.52 in   0935 AM 05/22   45.15N/89.12W/1518   
Elcho 4.8 SW                 1.31 in   0700 AM 05/22   45.38N/89.25W/1737   

...Lincoln County...
Tomahawk 1.2 SSW             1.59 in   0600 AM 05/22   45.46N/89.73W/1451   
Merrill 0.9 E                1.23 in   0800 AM 05/22   45.18N/89.66W/1250   
Merrill                      1.21 in   0945 AM 05/22   45.18N/89.75W/1289   
Merrill Airport              1.05 in   0935 AM 05/22   45.20N/89.72W/1310   
Merrill 8 W                  1.00 in   0600 AM 05/22   45.18N/89.85W/1419   
Merrill 14.1 W               0.92 in   0700 AM 05/22   45.15N/89.99W        
Tomahawk Airport             0.80 in   0935 AM 05/22   45.47N/89.82W/1465   
Bradley 0.7 N                0.70 in   0700 AM 05/22   45.54N/89.75W/1460   
Spirit Falls 2.7 NE          0.21 in   0830 AM 05/22   45.48N/89.95W/1509   

...Manitowoc County...
Brillion 2 SSE               1.23 in   0800 AM 05/22   44.14N/88.04W/858    
Valders 3.3 WSW              1.09 in   0700 AM 05/22   44.04N/87.94W/814    
St. Nazianz 2 W              1.07 in   0700 AM 05/22   44.00N/87.96W/853    
Manitowoc                    1.04 in   0942 AM 05/22   44.12N/87.64W/597    
Two Rivers                   0.95 in   0948 AM 05/22   44.15N/87.56W/6      
Mishicot 0.1 NNW             0.88 in   0800 AM 05/22   44.23N/87.64W/657    
Two Rivers 0.7 NE            0.87 in   0900 AM 05/22   44.16N/87.57W/592    
Two Rivers 4.1 WNW           0.86 in   0645 AM 05/22   44.19N/87.65W/647    
Manitowoc Airport            0.81 in   0856 AM 05/22   44.12N/87.67W/618    
Two Rivers 2 NW              0.81 in   0700 AM 05/22   44.18N/87.58W        
Manitowoc 4.1 SW             0.81 in   0630 AM 05/22   44.06N/87.74W/775    
Manitowoc 1.4 NW             0.75 in   0700 AM 05/22   44.11N/87.69W/657    
Two Rivers 1.2 N             0.75 in   0700 AM 05/22   44.17N/87.58W/607    
Millhome 2 E                 0.73 in   0703 AM 05/22   43.90N/87.91W/900    
Manitowoc 5.1 SW             0.71 in   0800 AM 05/22   44.06N/87.76W/788    
Reedsville                   0.53 in   0945 AM 05/22   44.23N/87.96W/869    

...Marathon County...
Knowlton 1 NW                2.35 in   0700 AM 05/22   44.73N/89.70W        
Evergreen 1 E                2.29 in   0800 AM 05/22   44.84N/89.60W/1197   
Weston 1 NE                  2.15 in   0700 AM 05/22   44.92N/89.54W/1216   
Mosinee 3.6 NE               2.14 in   0700 AM 05/22   44.82N/89.63W/1286   
Mosinee 2.0 W                1.90 in   0700 AM 05/22   44.79N/89.72W/1147   
Rothschild 0.5 ENE           1.88 in   0700 AM 05/22   44.89N/89.61W        
Mosinee                      1.83 in   0945 AM 05/22   44.86N/89.68W/1167   
Wausau Airport               1.81 in   0922 AM 05/22   44.93N/89.62W/1208   
Moon 6 SW                    1.77 in   0905 AM 05/22   44.70N/89.87W/1149   
Wausau                       1.76 in   0945 AM 05/22   44.95N/89.61W/1558   
Wausau 5.4 SSW               1.76 in   0700 AM 05/22   44.89N/89.69W/1213   
Evergreen 1.5 WSW            1.51 in   0650 AM 05/22   44.84N/89.67W/1174   
Wausau 2.4 W                 1.44 in   0630 AM 05/22   44.96N/89.69W        
Brokaw 1 W                   1.33 in   0945 AM 05/22   45.03N/89.69W/1364   
Spencer - Wwtp               1.25 in   0730 AM 05/22   44.75N/90.29W/1296   
Athens 0.6 SSW               1.10 in   0700 AM 05/22   45.03N/90.08W        
Spencer 3 E                  0.79 in   0945 AM 05/22   44.77N/90.21W/1288   
Stratford 4 W                0.52 in   0945 AM 05/22   44.81N/90.17W/1312   

...Marinette County...
Crivitz 12.5 WNW             2.03 in   0702 AM 05/22   45.28N/88.26W/896    
Amberg 9 E                   1.81 in   0612 AM 05/22   45.48N/87.81W/728    
Wausaukee 1.6 NW             1.81 in   0750 AM 05/22   45.38N/87.96W/745    
Niagara 5.1 SE               1.76 in   0700 AM 05/22   45.74N/87.92W/1025   
Wausaukee 2 NW               1.65 in   0905 AM 05/22   45.39N/87.97W/763    
Marinette - Wps              1.61 in   0556 AM 05/22   45.24N/88.01W/680    
Crivitz 1 ESE                1.22 in   0950 AM 05/22   45.23N/88.00W/896    
Menominee 1.6 S              1.00 in   0730 AM 05/22   45.10N/87.62W/592    
Peshtigo 1 S                 0.85 in   0730 AM 05/22   45.03N/87.74W/603    
Peshtigo 1 N                 0.81 in   0950 AM 05/22   45.06N/87.75W/607    
Athelstane 2 SW              0.46 in   0950 AM 05/22   45.40N/88.12W/959    

...Menominee County...
Keshena 2 WNW                1.45 in   0931 AM 05/22   44.89N/88.66W/871    

...Oconto County...
Mountain                     1.82 in   0949 AM 05/22   45.17N/88.44W/928    
Townsend 5.0 WSW             1.80 in   0800 AM 05/22   45.29N/88.68W/1389   
Shawano Lake 6 NNE           1.77 in   0800 AM 05/22   44.89N/88.48W        
Townsend 1.7 NNW             1.72 in   0600 AM 05/22   45.35N/88.61W/1352   
Breed 5 NE                   1.71 in   0930 AM 05/22   45.12N/88.37W/910    
Lakewood                     1.66 in   0930 AM 05/22   45.31N/88.47W/1220   
Suring 2.0 WNW               1.45 in   0700 AM 05/22   45.01N/88.41W/908    
Abrams 1.4 N                 0.85 in   0600 AM 05/22   44.80N/88.06W        
Little Suamico 1.8 SSW       0.45 in   0700 AM 05/22   44.68N/88.08W/675    
Pulaski 6.6 E                0.42 in   0700 AM 05/22   44.68N/88.10W        

...Oneida County...
Lac Du Flambeau 8.0 SSW      1.43 in   0805 AM 05/22   45.87N/89.99W        
Rhinelander                  1.28 in   1030 PM 05/21   45.62N/89.41W/1611   
Minocqua                     1.24 in   0630 AM 05/22   45.89N/89.73W/1601   
Rhinelander 2 SW             1.16 in   0730 AM 05/22   45.60N/89.45W/1571   
Willow                       1.16 in   0700 AM 05/22   45.70N/89.83W/1511   
Rhinelander 5 N              1.16 in   0615 AM 05/22   45.71N/89.42W/1654   
Rhinelander 5.5 NW           1.14 in   0645 AM 05/22   45.70N/89.48W        
Arbor Vitae - Woodruff 2 S   1.09 in   0910 AM 05/22   45.89N/89.65W/1619   
Rhinelander Airport          1.06 in   0949 AM 05/22   45.63N/89.48W/1599   
Tomahawk 3 W                 0.96 in   0910 AM 05/22   45.59N/89.72W/1535   

...Outagamie County...
New London 4.1 N             1.24 in   0600 AM 05/22   44.45N/88.73W/791    
New London 3.3 NE            1.08 in   0716 AM 05/22   44.43N/88.70W/818    
Black Creek 3 NW             0.83 in   0700 AM 05/22   44.50N/88.47W/785    
Black Creek 5.6 WNW          0.73 in   0633 AM 05/22   44.52N/88.55W/786    
Appleton 3.0 ESE             0.73 in   0620 AM 05/22   44.25N/88.34W        
Shiocton 0.6 NW              0.72 in   0730 AM 05/22   44.44N/88.58W/755    
Appleton WHBY Radio          0.63 in   0800 AM 05/22   44.25N/88.36W/750    
Grand Chute                  0.60 in   0948 AM 05/22   44.31N/88.42W/801    
Appleton                     0.54 in   0907 AM 05/22   44.29N/88.46W/830    
Seymour                      0.52 in   0950 AM 05/22   44.54N/88.25W/830    
Appleton 0.9 W               0.52 in   0700 AM 05/22   44.27N/88.42W/795    
Appleton 1.3 NW              0.51 in   0700 AM 05/22   44.28N/88.41W/809    
Appleton 2.3 NW              0.51 in   0300 AM 05/22   44.29N/88.43W/821    
Mackville 2 S                0.50 in   0530 AM 05/22   44.31N/88.41W/835    
Appleton 2.5 NW              0.42 in   0800 AM 05/22   44.30N/88.43W/837    

...Portage County...
Stevens Point                2.59 in   0730 AM 05/22   44.51N/89.59W/1081   
Plover 1.8 W                 2.56 in   0700 AM 05/22   44.46N/89.58W/1079   
Rudolph 1 NNE                2.56 in   0600 AM 05/22   44.53N/89.79W/1137   
Plover 1.4 S                 2.30 in   0700 AM 05/22   44.44N/89.55W/1084   
Rosholt                      2.27 in   0709 AM 05/22   44.63N/89.31W/1141   
Wisconsin Rapids 9.8 SE      2.11 in   0700 AM 05/22   44.28N/89.71W/1047   
Plover                       1.92 in   0947 AM 05/22   44.44N/89.55W/1082   
Wisconsin Rapids 6.6 ESE     1.87 in   0700 AM 05/22   44.35N/89.72W        
Amherst 3 SE                 1.78 in   0700 AM 05/22   44.41N/89.26W/1041   
Amherst 2.6 SSE              1.78 in   0700 AM 05/22   44.41N/89.26W        
Stevens Point Airport        1.74 in   0935 AM 05/22   44.55N/89.53W/1106   
Almond 5 NE                  1.56 in   0800 AM 05/22   44.31N/89.35W/1174   
Amherst 1.5 N                1.44 in   0700 AM 05/22   44.47N/89.28W        

...Shawano County...
Stockbridge-Munsee Reservati 1.65 in   0730 AM 05/22   44.87N/88.90W/1050   
Split Rock 1 NNW             1.59 in   0800 AM 05/22   44.72N/89.02W/1025   
Pella 3 SE                   1.53 in   0530 AM 05/22   44.74N/88.74W/869    
Praws 7                      1.47 in   0935 AM 05/22   44.85N/88.63W/857    
Shawano 2 SSW                1.36 in   0800 AM 05/22   44.76N/88.62W/809    
Shawano 5.3 WNW              1.27 in   0652 AM 05/22   44.80N/88.69W        
Shawano 1.6 NW               1.14 in   0700 AM 05/22   44.79N/88.62W/822    
Pulaski 3.7 W                0.81 in   0700 AM 05/22   44.67N/88.31W/912    
Shawano Airport              0.78 in   0935 AM 05/22   44.78N/88.57W/814    

...Vilas County...
Manitowish Waters 0.6 S      1.70 in   0700 AM 05/22   46.12N/89.88W/1612   
Phelps 2 SW                  1.30 in   0931 AM 05/22   46.04N/89.10W/1770   
Boulder Junction 9 ENE       1.14 in   0700 AM 05/22   46.19N/89.46W/1714   
Arbor Vitae-Johnson Lake     1.12 in   0612 AM 05/22   45.90N/89.73W/1601   
Eagle River Airport          1.12 in   0935 AM 05/22   45.93N/89.27W/1641   
Woodruff 2.5 NE              1.12 in   0700 AM 05/22   45.92N/89.66W/1662   
Boulder Junction 1.4 NE      1.09 in   0700 AM 05/22   46.13N/89.62W/1663   
Phelps 4.2 N                 1.07 in   0818 AM 05/22   46.12N/89.08W/1760   
St Germain 0.6 NW            1.03 in   0700 AM 05/22   45.92N/89.49W/1643   
Conover 4.8 WNW              1.01 in   0730 AM 05/22   46.09N/89.35W        
Land O Lakes Airport         0.97 in   0935 AM 05/22   46.15N/89.22W/1694   
Manitowish Waters Airport    0.93 in   0935 AM 05/22   46.12N/89.88W/1606   
Arbor Vitae Airport          0.92 in   0935 AM 05/22   45.93N/89.73W/1620   

...Waupaca County...
Ogdensburg 2 E               2.04 in   0700 AM 05/22   44.46N/88.98W/922    
Manawa 3.6 SSW               1.65 in   0708 AM 05/22   44.41N/88.95W/895    
Clintonville 0.9 N           1.48 in   0600 AM 05/22   44.62N/88.75W/802    
Clintonville Airport         1.46 in   0935 AM 05/22   44.62N/88.73W/816    
Iola 0.4 SSW                 1.46 in   0500 AM 05/22   44.50N/89.13W        
Waupaca Airport              1.33 in   0935 AM 05/22   44.33N/89.02W/809    
New London - WWTP            1.27 in   0700 AM 05/22   44.39N/88.75W/753    
Waupaca 7.6 SW               1.27 in   0700 AM 05/22   44.27N/89.17W/906    
Fremont                      1.26 in   0945 AM 05/22   44.28N/88.82W/748    
Clintonville 0.7 WNW         1.19 in   0700 AM 05/22   44.63N/88.76W        
Waupaca                      1.11 in   0937 AM 05/22   44.34N/89.11W/889    

...Waushara County...
Wild Rose 2.6 ENE            1.28 in   0700 AM 05/22   44.19N/89.20W/920    
Wild Rose 0.5 E              1.10 in   0500 AM 05/22   44.18N/89.24W/941    
Wautoma 1 WSW                1.07 in   0912 AM 05/22   44.06N/89.29W/856    
Wautoma 2 WNW                0.95 in   0950 AM 05/22   44.07N/89.31W/889    
Wautoma Airport              0.93 in   0856 AM 05/22   44.03N/89.30W/855    
Berlin WWTP                  0.90 in   0700 AM 05/22   43.99N/88.94W/768    

...Winnebago County...
Menasha 1.5 W                1.18 in   0900 AM 05/22   44.20N/88.47W/754    
Oshkosh 0.8 NW               1.17 in   0700 AM 05/22   44.02N/88.57W/758    
Oshkosh                      1.16 in   0945 AM 05/22   44.01N/88.55W/757    
Oshkosh Airport              1.15 in   0927 AM 05/22   43.97N/88.55W/794    
Oshkosh 1.6 ESE              1.03 in   0700 AM 05/22   44.01N/88.52W/748    
Oshkosh 2.0 W                0.90 in   0700 AM 05/22   44.02N/88.59W/778    
Zittau                       0.87 in   0600 AM 05/22   44.22N/88.78W/795    
Oshkosh 3.6 N                0.85 in   0600 AM 05/22   44.07N/88.55W        
Omro 0.5 SSE                 0.74 in   0600 AM 05/22   44.03N/88.74W/784    
Omro                         0.73 in   0906 AM 05/22   44.07N/88.69W/748    
Neenah 1.1 ENE               0.71 in   0700 AM 05/22   44.17N/88.45W/770    
Menasha 0.3 W                0.67 in   0700 AM 05/22   44.21N/88.44W/768    
Omro 1 WSW                   0.67 in   0700 AM 05/22   44.02N/88.78W/752    

...Wood County...
Rudolph 2.1 W                3.00 in   0700 AM 05/22   44.50N/89.84W/1120   
Vesper                       2.85 in   0947 AM 05/22   44.47N/89.95W/1013   
Port Edwards 2 E             2.59 in   0640 AM 05/22   44.34N/89.78W/1020   
New Rome 3 WNW               2.48 in   0700 AM 05/22   44.26N/89.94W/979    
Kellner 3 WNW                2.48 in   0700 AM 05/22   44.36N/89.77W/1029   
Pittsville - WWTP            2.42 in   0700 AM 05/22   44.44N/90.13W/1016   
Wisconsin Rapids 0.8 SSE     2.37 in   0800 AM 05/22   44.38N/89.83W/1014   
Wisconsin Rapids 0.8 W       2.35 in   0745 AM 05/22   44.39N/89.85W/1021   
Rudolph 1.8 ENE              2.32 in   0700 AM 05/22   44.51N/89.77W/1120   
New Rome 1 WNW               2.04 in   0700 AM 05/22   44.25N/89.91W        
Wisconsin Rapids Airport     2.00 in   0854 AM 05/22   44.37N/89.83W/1020   
New Rome 4 ENE               1.95 in   0905 AM 05/22   44.26N/89.81W/873    
Marshfield 6.5 S             1.70 in   0745 AM 05/22   44.57N/90.18W        
Port Edwards 1 SE            1.66 in   0700 AM 05/22   44.34N/89.84W/971    
Rudolph                      1.58 in   0950 AM 05/22   44.50N/89.79W/1028   
Marshfield 5.6 SSW           1.57 in   0700 AM 05/22   44.59N/90.20W/1230   
Hewitt 0.8 N                 1.40 in   0630 AM 05/22   44.64N/90.13W/1237   
Marshfield 1.8 NE            1.27 in   0700 AM 05/22   44.68N/90.15W        
Marshfield Airport           1.09 in   0920 AM 05/22   44.63N/90.18W/1241   

Observations are collected from a variety of sources with varying
equipment and exposures. We thank all volunteer weather observers 
for their dedication. Not all data listed are considered official.

Photos

City Name (County or Credit)	City Name (County or Credit)	City Name (County or Credit)	City Name (County or Credit)