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Just before 8 PM CDT on August 2nd, thunderstorms developed along a convergence zone near the lake and given the lack of shear and high precipitable water values around 1.0-1.5 inches, storms stalled over southern Milwaukee County for a few hours. This resulted in a prolonged period of very heavy rainfall and localized flash flooding that swamped vehicles and inundated roadways across southern Milwaukee County. Portions of the area saw around 3.0 inches of rainfall with pockets of higher amounts approaching 5.0-6.0 inches. However, due to precipitation being 0.5-1.0 inch below average for the week prior, it helped mitigate the flooding impacts from being worse. Nonetheless, two flash flood warnings were issued for portions of southern Milwaukee and northern Racine counties. Eventually, around 10:30 PM CDT the stall showers finally began to move south into Racine and Kenosha counties where they were able to see some of the action. These areas to the south saw upwards of 1.0-3.0 inches. |
 Radar reflectivity loop of the storms that produced flash flooding/heavy rains in southeast WI on August 2, 2020 |
Flash Flooding:
These fairly localized storms stalled out across southern Milwaukee County and produced heavy rainfall. Around 9 PM CDT, Mitchell Airport recorded 0.76" of rainfall in 10 minutes, while 2.56" of rainfall in 30 minutes (between 8:45 PM to 9:15 PM) was observed at 97th Street north of Greenfield! Elsewhere saw 1.0-2.5" of rainfall in hour across southern portions of Milwaukee County. This resulted in numerous reports of flash flooding from West Allis, Greenfield, Oak Creek, Franklin, and surrounding areas. Several streets were closed including portions of I-43, vehicles were submerged, and backyards and basements were flooded.
Flooding in Southern Milwaukee County
A few photos of the extent of the flash flooding/heavy rainfall. |
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| Flooding in Oak Creek Courtesy of Chris Keske | Flooding in Oak Creek Courtesy of Chris Keske | Flooding around Honey Creek in West Allis Courtesy of Brett Lemoine | Flooding around Honey Creek in West Allis Courtesy of Brett Lemoine |
Additional Impacts
Additional reports of impacts from the flash flooding/heavy rainfall.
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Rainfall Totals:
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| Estimated Rainfall Totals for August 2, 2020 | CoCoRaHS 24 hr Rainfall Reports for August 2, 2020 |
Storm Reports
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1132 AM CDT MON AUG 3 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0942 AM HEAVY RAIN 2 S KEWASKUM 43.50N 88.23W
08/03/2020 M3.50 INCH WASHINGTON WI PUBLIC
PUBLIC REPORT RELAYED VIA BROADCAST MEDIA.
0938 AM HEAVY RAIN 1 N GREENFIELD 42.98N 88.00W
08/03/2020 M6.40 INCH MILWAUKEE WI PUBLIC
PUBLIC REPORT RELAYED VIA BROADCAST MEDIA.
0825 AM HEAVY RAIN NEWBURG 43.43N 88.05W
08/03/2020 M2.09 INCH WASHINGTON WI MESONET
MESONET STATION NWSTJ NEWBURG.
0824 AM HEAVY RAIN 1 N PORT WASHINGTON 43.40N 87.88W
08/03/2020 M1.31 INCH OZAUKEE WI MESONET
MESONET STATION PTWSH PORT WASHINGTON.
0824 AM HEAVY RAIN SHOREWOOD 43.09N 87.88W
08/03/2020 M1.24 INCH MILWAUKEE WI MESONET
MESONET STATION SORWD SHOREWOOD.
0816 AM HEAVY RAIN 1 SE SAINT FRANCIS 42.97N 87.86W
08/03/2020 M2.49 INCH MILWAUKEE WI MESONET
MESONET STATION FW2905 CUDAHY.
0815 AM HEAVY RAIN 2 ENE TWIN LAKES 42.53N 88.22W
08/03/2020 M1.65 INCH KENOSHA WI MESONET
MESONET STATION DW6766 BASSETT.
0800 AM HEAVY RAIN 1 WSW ELKHORN 42.67N 88.57W
08/03/2020 M2.46 INCH WALWORTH WI COCORAHS
COCORAHS STATION WI-WW-23 ELKHORN 1.5 WSW.
0743 AM HEAVY RAIN 2 SW HALES CORNERS 42.92N 88.07W
08/03/2020 M1.57 INCH MILWAUKEE WI PUBLIC
0731 AM HEAVY RAIN 3 WSW BROOKFIELD 43.05N 88.18W
08/03/2020 M1.41 INCH WAUKESHA WI CO-OP OBSERVER
CO-OP OBSERVER STATION BFDW3 2.9 W
BROOKFIELD.
0715 AM HEAVY RAIN 2 SE BIG BEND 42.85N 88.18W
08/03/2020 M1.04 INCH WAUKESHA WI TRAINED SPOTTER
0705 AM HEAVY RAIN 1 ESE BROWNS LAKE 42.69N 88.21W
08/03/2020 M1.89 INCH RACINE WI MESONET
MESONET STATION FW4342 BURLINGTON.
0700 AM HEAVY RAIN 2 ENE FRANKLIN 42.90N 87.97W
08/03/2020 M5.74 INCH MILWAUKEE WI COCORAHS
COCORAHS STATION WI-MW-28 FRANKLIN 2.4 ENE.
0700 AM HEAVY RAIN 1 ENE GREENDALE 42.94N 87.98W
08/03/2020 M3.54 INCH MILWAUKEE WI COCORAHS
COCORAHS STATION WI-MW-23 GREENDALE 1.0 ENE.
0700 AM HEAVY RAIN 1 SE SOUTH MILWAUKEE 42.90N 87.85W
08/03/2020 M3.31 INCH MILWAUKEE WI CO-OP OBSERVER
CO-OP OBSERVER STATION SEEW3 SOUTH
MILWAUKEE-WWTP.
0700 AM HEAVY RAIN 1 SE HALES CORNERS 42.93N 88.04W
08/03/2020 M2.68 INCH MILWAUKEE WI COCORAHS
COCORAHS STATION WI-MW-33 HALES CORNERS 0.7
SE.
0700 AM HEAVY RAIN NORTH BAY 42.76N 87.78W
08/03/2020 M2.02 INCH RACINE WI COCORAHS
COCORAHS STATION WI-RC-32 RACINE 2.6 NNE.
0700 AM HEAVY RAIN 1 W BROWNS LAKE 42.69N 88.26W
08/03/2020 M1.94 INCH RACINE WI COCORAHS
COCORAHS STATION WI-RC-27 BURLINGTON 1.4 NE.
0700 AM HEAVY RAIN 1 W ALLENTON 43.42N 88.35W
08/03/2020 M1.91 INCH WASHINGTON WI CO-OP OBSERVER
CO-OP OBSERVER STATION ALLW3 ALLENTON.
0700 AM HEAVY RAIN 2 WNW KEWASKUM 43.53N 88.27W
08/03/2020 M1.83 INCH WASHINGTON WI COCORAHS
COCORAHS STATION WI-WS-4 KEWASKUM 1.8 WNW.
0700 AM HEAVY RAIN 4 SSW KENOSHA 42.52N 87.84W
08/03/2020 M1.78 INCH KENOSHA WI COCORAHS
COCORAHS STATION WI-KN-14 PLEASANT PRAIRIE
2.1 E.
0700 AM HEAVY RAIN 3 NW CALEDONIA 42.83N 87.99W
08/03/2020 M1.59 INCH RACINE WI COCORAHS
COCORAHS STATION WI-RC-7 CALEDONIA 3.6 WNW.
0700 AM HEAVY RAIN ROCHESTER 42.74N 88.22W
08/03/2020 M1.55 INCH RACINE WI COCORAHS
COCORAHS STATION WI-RC-25 ROCHESTER 0.2 SE.
0700 AM HEAVY RAIN 2 SW ELMWOOD PARK 42.68N 87.85W
08/03/2020 M1.05 INCH RACINE WI COCORAHS
COCORAHS STATION WI-RC-22 ELMWOOD PARK 1.8
SW.
0642 AM HEAVY RAIN 2.5 ESE OAK CREEK 42.87N 87.85W
08/03/2020 M5.33 INCH MILWAUKEE WI TRAINED SPOTTER
24 HOUR RAINFALL TOTAL.
0630 AM HEAVY RAIN 1 WSW EAGLE LAKE 42.70N 88.15W
08/03/2020 M1.65 INCH RACINE WI COCORAHS
COCORAHS STATION WI-RC-29 EAGLE LAKE 1.2
WSW.
0616 AM HEAVY RAIN 2 WSW ALLENTON 43.42N 88.37W
08/03/2020 M2.03 INCH WASHINGTON WI COCORAHS
COCORAHS STATION WI-WS-33 ALLENTON 1.4 WSW.
0608 AM HEAVY RAIN 1 NNW WEST BEND 43.44N 88.20W
08/03/2020 M3.10 INCH WASHINGTON WI COCORAHS
COCORAHS STATION WI-WS-23 WEST BEND 1.3 NNW.
0245 AM HEAVY RAIN 0.6 NNE GREENFIELD 42.97N 88.00W
08/03/2020 M6.78 INCH MILWAUKEE WI TRAINED SPOTTER
12 HOUR TOTAL ENDING AT 2:45 AM.
0225 AM HEAVY RAIN 2 S WEST ALLIS 42.98N 88.04W
08/03/2020 M4.73 INCH MILWAUKEE WI MESONET
MMSD SITE ON 97TH STREET. 2.54 INCHES FELL
IN 30 MINUTES FROM 8:45 TO 9:15 PM 8/2.
1159 PM HEAVY RAIN 2 SE GREENDALE 42.92N 87.97W
08/02/2020 M6.55 INCH MILWAUKEE WI TRAINED SPOTTER
12 HOUR RAINFALL TOTAL. LOCATION ESTIMATED.
1120 PM HEAVY RAIN 1 NW OAK CREEK 42.89N 87.91W
08/02/2020 M4.34 INCH MILWAUKEE WI TRAINED SPOTTER
1118 PM FLASH FLOOD 1 SE WEST ALLIS 43.00N 88.02W
08/02/2020 MILWAUKEE WI BROADCAST MEDIA
RELAYED BY WITI. WATER UP TO BASE OF HOUSES
NEAR HONEY CREEK BY 82ND AND ARTHUR.
1104 PM FLASH FLOOD GREENFIELD 42.96N 88.01W
08/02/2020 MILWAUKEE WI LAW ENFORCEMENT
I43/894 CLOSED DUE TO HIGH WATER AT 76TH ST
RAMP.
1100 PM FLASH FLOOD 3 SSE WEST MILWAUKEE 42.97N 87.95W
08/02/2020 MILWAUKEE WI PUBLIC
WILSON PARK CREEK IS RUNNING HIGH AND NEARLY
TO BASE OF BRIDGE ON HOWARD AVE.
1054 PM FLASH FLOOD 1 ESE WEST ALLIS 43.00N 88.01W
08/02/2020 MILWAUKEE WI BROADCAST MEDIA
RELAYED VIA WITI. CAR DROVE INTO FLOODED
ROADWAY AND STALLED.
1052 PM FLASH FLOOD 1 ESE WEST ALLIS 43.00N 88.01W
08/02/2020 MILWAUKEE WI BROADCAST MEDIA
RELAYED VIA WITI. CAR DROVE INTO FLOODED
ROADWAY.
1048 PM FLASH FLOOD 2 ESE OAK CREEK 42.87N 87.85W
08/02/2020 MILWAUKEE WI TRAINED SPOTTER
WATER OVER SIDEWALKS AND ACRE RETENTION POND
OVERFLOWING. PASSING MOTORIST STALLED OUT
THEIR SUV WITH WATER UP TO THEIR HEADLIGHTS.
1047 PM FLASH FLOOD 1 ESE WEST ALLIS 43.00N 88.01W
08/02/2020 MILWAUKEE WI BROADCAST MEDIA
RELAYED VIA WITI. CAR DROVE INTO WATER AND
GOT STUCK ON ROAD.
1039 PM FLASH FLOOD WEST MILWAUKEE 43.02N 87.97W
08/02/2020 MILWAUKEE WI LAW ENFORCEMENT
VIA MILWAUKEE COUNTY SHERIFF. ROAD CLOSURES
THROUGHOUT SOUTHERN MILWAUKEE COUNTY.
1018 PM FLASH FLOOD 2 N OAK CREEK 42.91N 87.90W
08/02/2020 MILWAUKEE WI TRAINED SPOTTER
WATER UP TO THE DOOR HANDLES OF SUV PARKED
IN THE ROAD.
0340 AM HEAVY RAIN 1 NNW OAK CREEK 42.90N 87.91W
08/03/2020 M5.24 INCH MILWAUKEE WI MESONET
MESONET STATION EW5433 OAK CREEK.
0331 AM HEAVY RAIN 2 S WEST ALLIS 42.98N 88.03W
08/03/2020 M4.54 INCH MILWAUKEE WI MESONET
MESONET STATION DW5497 MILWAUKEE.
0331 AM HEAVY RAIN 1 NNE GREENFIELD 42.98N 88.00W
08/03/2020 M5.08 INCH MILWAUKEE WI MESONET
MESONET STATION FW7576 MILWAUKEE.
0306 AM HEAVY RAIN 2 W CUDAHY 42.95N 87.90W
08/03/2020 M4.80 INCH MILWAUKEE WI ASOS
ASOS STATION KMKE MILWAUKEE-GEN MITCHELL
ARPT.
0200 AM HEAVY RAIN 2 NW GREENFIELD 42.98N 88.03W
08/03/2020 M2.87 INCH MILWAUKEE WI CO-OP OBSERVER
CO-OP OBSERVER STATION GNDW3 1.9 S WEST
ALLIS.
1110 PM HEAVY RAIN 1 NNW SAINT FRANCIS 42.99N 87.88W
08/02/2020 M2.87 INCH MILWAUKEE WI MESONET
MESONET STATION DW0835 MILWAUKEE.
1044 PM HEAVY RAIN 2 E FRANKLIN 42.89N 87.97W
08/02/2020 M5.42 INCH MILWAUKEE WI TRAINED SPOTTER
FROM 1PM TO 10:15PM.
1008 PM HEAVY RAIN 1 WNW WEST MILWAUKEE 43.02N 87.99W
08/02/2020 E2.75 INCH MILWAUKEE WI PUBLIC
WEST ALLIS/WEST MILWAUKEE BORDER.
0950 PM HEAVY RAIN 1 S WEST MILWAUKEE 42.99N 87.97W
08/02/2020 M2.50 INCH MILWAUKEE WI TRAINED SPOTTER
MEASURED IN PAST 2 HOURS. 1/4 MI WEST OF
JACKSON PARK.
&&
$$
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