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Overview
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Two rounds of thunderstorms produced significant rainfall across portions of northern Illinois on Monday August 9th. A morning round of storms produced heavy rainfall across parts of northern Illinois, especially across portions of southern Boone and McHenry Counties where up to 3 to 4 inches of rain fell causing instances of urban and small stream flooding.
The afternoon and evening thunderstorms were mainly supercells that produced numerous tornadoes, some of which caused noteworthy tree and structural damage in portions of Ogle, DeKalb, and Kane Counties. NWS Chicago issued a total of 13 Tornado, 2 Severe Thunderstorm, and 3 Special Marine Warnings between 3:00 PM and 10:15 PM. A total of 10 tornadoes were confirmed in the NWS Chicago County Warning Area (CWA). |
 Preliminary Event Summary Graphic |
Tornadoes:
Full Public Information Statement
Tornado #1: North of Esmond EF-0
Summary: This brief tornado touched down near Lindenwood and Esmond Roads and produced minor damage to a farm outbuilding’s roof. The tornado was likely on the ground for less than one minute. |
Tornado #2: South of Kirkland EF-1
Summary: After the tornado that occurred north of Esmond lifted, the same storm produced another brief tornado south of Kirkland. Based on ground video, this tornado may have intermittently skipped on the ground shortly after touching down west of Malta Road. Drone footage then shows crop damage increased in a farm east of Byers Road. The tornado then heavily damaged a barn on Base Line Rd. before it dissipated in the field east of Pearl Street. |
Tornado #3: McHenry EF-1
Summary: A brief tornado touched down at Petersen Farm on the north side of McHenry. The tornado tracked eastward and impacted a couple of townhouses along Evergreen Circle before lifting just before it reached the Home Depot store on Richmond Rd. The tornado was on the ground for less than a minute, damaged a barn and ground marker at Petersen Farm, and caused some damage to sidings and porches, in addition to removing a portion of a roof at the townhouse complex along Evergreen Circle. |
Tornado #4: Burlington EF-1
Summary: This tornado touched down just east of the DeKalb-Kane County line just west of Plank Road where it caused damage to a residence due west of Engel Road that was consistent with an EF-1 tornado, blowing a garage door in and uprooting several trees on the property. The tornado then tracked east along the south side of Plank Road, damaging a large farm outbuilding west of Lawrence Road. The tornado then curled southeast where it produced sporadic tree and crop damage along Waughon and Peplow Roads before lifting near the intersection of Burlington and Romke Roads |
Tornado #5: North of Creston EF-0
Summary: This tornado developed immediately east of Interstate 39 near South Mulford Road and subsequently tracked eastward, paralleling Illinois Route 64. Damage to two farm outbuildings was noted, one on South Chamberlain Road and another on Edmond Road just east of the DeKalb County line. A video of the tornado shows that winds entered the building on the southwest facade which caused uplift of the roof and subsequent collapse of the walls. This damage, and damage to vegetation in the area was consistent with a high-end EF-0 tornado with winds of around 85 mph. The tornado continued to track east, immediately to the north of Route 64. Storm chaser video shows that the tornado crossed Route 64 immediately east of McQueen Road and continued east of Malta Road, where it produced some minor tree damage and dissipated soon afterwards. |
Tornado #6: Paw Paw EF-U
Summary: Crop damage seen on satellite imagery indicates that this tornado touched down west-northwest of Paw Paw near German Rd. just north of Chicago Rd. The tornado tracked to the northeast and produced a swath of damage in the corn fields that it crossed, with the most pronounced crop damage occurring between Moffet Rd. and Paw Paw Rd., based on drone footage and satellite imagery. The tornado then lifted just as it crossed Paw Paw Rd. and reached Howlett Rd. Since the tornado did not produce damage to any qualified damage indicators, a peak wind speed could not be estimated, and thus this tornado has been rated as an EF-U. |
Tornado #7: Sycamore Tornado #1 EF-1
Summary: This tornado was associated with the same storm that spawned the tornado north of Creston and touched down west of Fenstermaker Road south of Bethany Road. There, it produced a concentrated corridor of damage where two farm outbuildings were nearly completely destroyed. Several trees in the area had trunks snapped near their bases, and a single family residence exhibited some shingle loss along with two broken windows. This damage is consistent with a high-end EF-1 tornado. Drone footage indicates that the tornado quickly widened to 150 yards as it snaked east towards Airport Road where it produced additional EF-1 damage to trees and farm outbuildings. Drone footage and ground video suggest the tornado lifted near the South Branch of the Kishwaukee River to the north of Barber Greene Road. |
Tornado #8: Sycamore Tornado #2 EF-0
Summary: Based on an NWS ground survey and spotter video, a second brief touchdown occurred on Barber Greene Road near the DeKalb and Kane County lines where some tree damage was noted. |
Tornado #9: Sycamore Tornado #3 EF-0
Summary: Based on spotter video, a third tornado associated with a new mesocyclone touched down south of Peterson Road and tracked east where it caused damage to several properties between Fabris and Meredith Roads. Drone footage then suggests the tornado widened considerably, to nearly 400 yards, as it tracked southeast across a field north of Welter Road and west of Meredith Road. The tornado then contracted, crossed Welter Road, and dissipated. |
Tornado #10: Sycamore (Virgil) Tornado #4 EF-U
Summary: Spotter video shows a brief touchdown in a field to the south of Route 64 and north of Welter Road. Location was estimated by time matching spotter video, landmarks, and radar data. Since the tornado did not produce damage to any qualified damage indicators, a peak wind speed could not be estimated, and thus this tornado has been rated as an EF-U. |
The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
| 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 |
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When a tornado is known to have occurred but does not cause damage to any qualified damage indicators, or if the only damage is located in an area that is inaccessible to NWS storm survey personnel, then a tornado may be assigned the EF-Unknown (EF-U) rating.
Photos:
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| Tornado north of Paw Paw. Courtesy of Matt Friedlein. | Tornado northwest of Malta. Courtesy of Bob Waszak. | Tornado near the Kane and DeKalb County line northwest of Maple Park. Courtesy of Galen Cooper. | Tornado near Kirkland. Courtesy of Tyler Pardun. |
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| Tornado north of Esmond. Courtesy of Landon Moeller. | Tornado northwest of Malta. Courtesy of Kaylan Patel. | Tornado near Sycamore. Courtesy of Diego Garcia. | Swirl pattern in corn caused by the Kirkland Tornado. Couresty of Jake Miller. |
Radar and Warnings Issued:
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| KLOT Radar loop from 3 pm - 7:45 pm with warnings overlaid. | Tornado Warnings (red), Severe Thunderstorm Warnings (yellow), Special Marine Warnings (purple), and Flood Advisories (green) issued on Monday afternoon and evening. |
Storm Reports
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| August 9th Storm Reports |
PRELIMINARY LOCAL STORM REPORT...SUMMARY NATIONAL WEATHER SERVICE CHICAGO IL 1131 PM CDT MON AUG 9 2021 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0948 PM HEAVY RAIN 1 WNW SOUTH ELGIN 42.00N 88.31W 08/09/2021 M2.65 INCH KANE IL PUBLIC RAINFALL TOTAL FOR THE DAY. 0658 PM TORNADO 1 WSW CAMPTON HILLS 41.93N 88.42W 08/09/2021 KANE IL TRAINED SPOTTER MULTIPLE REPORTS OF A BRIEF TORNADO NEAR CAMPTON HILLS. 0644 PM TORNADO 1 ESE LILY LAKE 41.95N 88.46W 08/09/2021 KANE IL AMATEUR RADIO MULTIPLE REPORTS OF A WEAK TORNADO NEAR LILY LAKE. 0631 PM TORNADO 1 S VIRGIL 41.93N 88.54W 08/09/2021 KANE IL AMATEUR RADIO RAIN-WRAPPED TORNADO REPORTED NEAR BEITH ROAD AND MEREDITH ROAD. 0629 PM FUNNEL CLOUD 3 NE MAPLE PARK 41.94N 88.56W 08/09/2021 KANE IL AMATEUR RADIO TORNADO ON THE GROUND NORTHEAST OF MAPLE PARK. 0621 PM HEAVY RAIN ISLAND LAKE 42.27N 88.20W 08/09/2021 M2.78 INCH LAKE IL TRAINED SPOTTER RAINFALL AT PERSONAL WEATHER STATION SINCE 7 AM. 0618 PM TORNADO 4 ESE SYCAMORE 41.96N 88.62W 08/09/2021 DE KALB IL TRAINED SPOTTER TORNADO ON THE GROUND EAST OF SYCAMORE. POSSIBLE DAMAGE TO STRUCTURES. 0617 PM TORNADO 2 SE SYCAMORE 41.96N 88.66W 08/09/2021 DE KALB IL TRAINED SPOTTER TORNADO ON THE GROUND EAST OF SPOTTER AT BETHANY ROAD AND IL-23. 0613 PM TORNADO 2 SSE SYCAMORE 41.97N 88.67W 08/09/2021 DE KALB IL BROADCAST MEDIA TV CREW REPORTS DAMAGE TO TREES AND POWER LINES NEAR BETHANY ROAD AND FENSTERMAKER ROAD NEAR SYCAMORE. TIME ESTIMATED BY RADAR. 0605 PM FUNNEL CLOUD 3 WSW SYCAMORE 41.97N 88.74W 08/09/2021 DE KALB IL TRAINED SPOTTER MULTIPLE REPORTS RECEIVED OF WALL CLOUD WITH POSSIBLE FUNNELS BETWEEN DEKALB AND SYCAMORE. 0602 PM TORNADO 1 NW PAW PAW 41.70N 89.00W 08/09/2021 LEE IL NWS EMPLOYEE MULTIPLE REPORTS OF BRIEF TORNADO TOUCHDOWN. 0528 PM TORNADO 2 SW ESMOND 42.01N 88.96W 08/09/2021 OGLE IL TRAINED SPOTTER UPDATES PREVIOUS TORNADO REPORT FROM 2 SW ESMOND. NUMEROUS REPORTS OF SMALL TORNADO WITH VISIBLE DEBRIS ON THE GROUND. VIDEO SHARED TO SOCIAL MEDIA SHOWS SMALL TORNADO ON THE GROUND MOVING EAST ALONG IL-64 FOR SEVERAL MINUTES. 0526 PM TORNADO 2 WSW BURLINGTON 42.05N 88.58W 08/09/2021 KANE IL LAW ENFORCEMENT CORRECTS AND UPDATES PREVIOUS TSTM WND DMG REPORT FROM 2 WSW BURLINGTON. KANE COUNTY SHERIFFS OFFICE REPORTS DAMAGE TO A STRUCTURE ALONG PLANK ROAD NEAR EAGLE ROAD. CONFIRMED TORNADO WITH THIS DAMAGE GIVEN TORNADO DEBRIS SIGNATURE ON KLOT FROM ABOUT 5:24 PM UNTIL 5:33 PM. TIME ESTIMATED BY RADAR. 0452 PM TORNADO 3 SW KINGSTON 42.07N 88.80W 08/09/2021 DE KALB IL PUBLIC MULTIPLE REPORTS OF A TORNADO SOUTH OF KENTLAND AND KINGSTON. 0448 PM TORNADO 1 N MCHENRY 42.36N 88.27W 08/09/2021 MCHENRY IL LAW ENFORCEMENT MCHENRY PD REPORTS POSSIBLE TORNADO NEAR BLAKE ROAD AND RICHMOND ROAD IN MCHENRY. 0440 PM TSTM WND DMG 1 ESE MCCULLOM LAKE 42.36N 88.27W 08/09/2021 MCHENRY IL LAW ENFORCEMENT DAMAGE TO PORCHES ALONG EVERGREEN CIRCLE IN MCHENRY. TIME ESTIMATED BY RADAR. 0432 PM TORNADO 2 SE ESMOND 42.02N 88.91W 08/09/2021 DE KALB IL PUBLIC MULTIPLE REPORTS OF A TORNADO SOUTHEAST OF ESMOND. 0430 PM FUNNEL CLOUD MONROE CENTER 42.10N 89.00W 08/09/2021 OGLE IL BROADCAST MEDIA TV CREW SPOTTED FUNNEL CLOUD FOR 5-10 SECONDS NEAR MONROE CENTER. 0410 PM FLOOD 3 SE BELVIDERE 42.23N 88.80W 08/09/2021 BOONE IL TRAINED SPOTTER FLOODING OF SMALL STREAMS AND DITCHES. RELAYED VIA SPOTTER NETWORK. 0405 PM FLOOD 1 E ROCKFORD 42.27N 89.07W 08/09/2021 WINNEBAGO IL PUBLIC MULTIPLE VIDEOS SHARED VIA SOCIAL MEDIA SHOW MINOR STREET FLOODING IN ROCKFORD. 0355 PM FLOOD 1 NNW ROCKFORD 42.29N 89.11W 08/09/2021 WINNEBAGO IL BROADCAST MEDIA PHOTO SHARED VIA SOCIAL MEDIA BY BROADCAST MEDIA SHOWS MINOR FLOODING OF AUBURN STREET NEAR RUSSELL AVENUE. TWO LANES BLOCKED, ROAD CLOSED BY POLICE. 0330 PM HEAVY RAIN 1 NE ROCKFORD 42.29N 89.07W 08/09/2021 M2.52 INCH WINNEBAGO IL PUBLIC UPDATES PREVIOUS HEAVY RAIN REPORT FROM 1 NE ROCKFORD. PRIVATE WEATHER STATION REPORTS 2.52 INCHES OVER 30 MINUTES AND 1.82 INCHES OVER 20 MINUTES JUST NORTH OF DOWNTOWN ROCKFORD. STORM TOTAL SINCE 2:00 PM IS 2.53 INCHES. 0305 PM FLOOD 1 S LOVES PARK 42.30N 89.06W 08/09/2021 WINNEBAGO IL PUBLIC NUMEROUS PUBLIC REPORTS OF STREET FLOODING RECEIVED VIA MPING IN ROCKFORD AND LOVES PARK AREAS. 1200 PM HEAVY RAIN 2 SSE WOODSTOCK 42.28N 88.43W 08/09/2021 M4.40 INCH MCHENRY IL PUBLIC PRIVATE WEATHER STATION REPORTED 4.4 INCHES SINCE 6:00 AM, WITH ABOUT 2 INCHES IN 1 HOUR ENDING AT 10:25 AM. 1200 PM HEAVY RAIN 2 WSW MARENGO 42.24N 88.65W 08/09/2021 M4.54 INCH MCHENRY IL PUBLIC PRIVATE WEATHER STATION REPORTED 4.54 INCHES SINCE 6:00 AM, WITH OVER 2.8 INCHES IN 90 MINUTES. 1200 PM HEAVY RAIN 1 WSW WOODSTOCK 42.31N 88.48W 08/09/2021 M4.21 INCH MCHENRY IL PUBLIC PRIVATE WEATHER STATION REPORTED 4.21 INCHES SINCE 6:00 AM, WITH OVER 1.9 INCHES IN 1 HOUR ENDING 10:15 AM. 1200 PM HEAVY RAIN 2 SE MARENGO 42.24N 88.59W 08/09/2021 E4.55 INCH MCHENRY IL PUBLIC PRIVATE WEATHER STATION REPORTS 4.55 INCHES SINCE 6:00 AM, WITH OVER 2 INCHES IN 1 HOUR ENDING AT 10:00 AM. 1200 PM HEAVY RAIN 3 SW TIMBERLANE 42.30N 88.90W 08/09/2021 M4.68 INCH BOONE IL PUBLIC PRIVATE WEATHER STATION REPORTED 4.68 INCHES SINCE 6:00 AM, WITH OVER 2.5 INCHES IN 1 HOUR ENDING AT 9:30 AM. 1145 AM HEAVY RAIN 2 NE GARDEN PRAIRIE 42.28N 88.69W 08/09/2021 M4.46 INCH MCHENRY IL PUBLIC PRIVATE WEATHER STATION REPORTED 4.46 INCHES SINCE 6:00 AM, WITH OVER 2.2 INCHES IN 1 HOUR ENDING 9:55 AM. 0930 AM HEAVY RAIN 1 WNW CHERRY VALLEY 42.24N 88.98W 08/09/2021 M2.19 INCH WINNEBAGO IL TRAINED SPOTTER 2.19 INCHES AS OF 9:30 AM, WITH 1.92 INCHES IN 1 HOUR.
Rain Reports
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| August 9th Rainfall |
COCORAHS PRECIPITATION SUMMARY NATIONAL WEATHER SERVICE CHICAGO IL 1000 AM CDT TUE AUG 10 2021 COCORAHS PRECIPITATION REPORTS THESE REPORTS ARE CONSIDERED SUPPLEMENTAL AND UNOFFICIAL VALUES ARE FOR THE PREVIOUS 24 HOURS ENDING AROUND 7 AM LOCAL TIME :COCORAHS PRECIPITATION REPORTS IN ILLINOIS : SNOW SNOW WATER : PCPN FALL DEPTH EQUIV IL-MCH-33 : WOODSTOCK 3.8 SW * : 5.11 / MM / MM / MM IL-MCH-87 : MARENGO 0.7 NNW * : 4.71 / MM / MM / MM IL-MCH-52 : WOODSTOCK 0.8 SSW * : 3.96 / MM / MM / MM IL-WN-48 : ROCKFORD 3.8 NNW * : 3.89 / MM / MM / MM IL-MCH-13 : BULL VALLEY 2.5 WNW * : 3.67 / 0.0 / 0.0 / 0.00 IL-MCH-77 : WONDER LAKE 1.4 NE * : 3.32 / MM / MM / MM IL-WN-43 : ROCKFORD 3.8 S * : 3.05 / MM / MM / MM IL-DK-27 : KINGSTON 2.3 WNW * : 3.00 / MM / MM / MM IL-KN-86 : ELGIN 7.5 WSW * : 2.98 / MM / MM / MM IL-MCH-96 : HUNTLEY 1.6 SW * : 2.84 / MM / MM / MM IL-WN-44 : WINNEBAGO 5.4 SE * : 2.79 / MM / MM / MM IL-MCH-80 : HUNTLEY 0.1 SSE * : 2.64 / 0.0 / 0.0 / MM IL-MCH-83 : CRYSTAL LAKE 1.0 WSW * : 2.56 / MM / MM / MM IL-WN-41 : SOUTH BELOIT 1.5 ESE * : 2.54 / MM / MM / MM IL-WN-51 : MACHESNEY PARK 1.5 SSW * : 2.42 / MM / MM / MM IL-BN-14 : CAPRON 0.1 N * : 2.37 / MM / MM / MM IL-MCH-94 : MCHENRY 2.4 E * : 2.36 / MM / MM / MM IL-WN-26 : ROCKFORD 1.5 ENE * : 2.36 / MM / MM / MM IL-MCH-43 : ALGONQUIN 0.7 N * : 2.35 / 0.0 / 0.0 / 0.00 IL-WN-45 : MACHESNEY PARK 0.9 W * : 2.33 / MM / MM / MM IL-MCH-102: ALGONQUIN 3.4 W * : 2.25 / MM / MM / MM IL-LK-100 : LONG LAKE 0.4 S * : 2.23 / MM / MM / MM IL-KN-67 : ST. CHARLES 6.0 NW * : 2.14 / 0.0 / 0.0 / MM IL-MCH-34 : PISTAKEE HIGHLANDS 0.4 SW* : 2.12 / MM / MM / MM IL-KN-98 : GILBERTS 0.5 N * : 2.10 / MM / MM / MM IL-BN-19 : BELVIDERE 5.0 NNW * : 2.10 / MM / MM / MM IL-LK-114 : ROUND LAKE HEIGHTS 0.5 NE* : 2.02 / MM / MM / MM IL-MCH-103: HARVARD 4.4 NNE * : 2.01 / MM / MM / MM IL-KN-95 : ELGIN 2.5 W * : 1.94 / 0.0 / MM / MM IL-CK-317 : HOFFMAN ESTATES 0.6 ESE * : 1.93 / MM / MM / MM IL-LK-81 : LAKE VILLA 2.3 WSW * : 1.93 / MM / MM / MM IL-WN-40 : ROCKFORD 4.5 WSW * : 1.92 / MM / MM / MM IL-MCH-95 : CARY 0.5 SSW * : 1.92 / MM / MM / MM IL-MCH-35 : LAKEMOOR 1.9 NW * : 1.84 / MM / MM / MM IL-CK-150 : ARLINGTON HEIGHTS 1.2 S * : 1.77 / MM / MM / MM IL-DP-124 : BARTLETT 1.4 SE * : 1.77 / MM / MM / MM IL-LK-9 : LAKE VILLA 1.1 SSW * : 1.77 / MM / MM / MM IL-DP-100 : BARTLETT 1.1 SE * : 1.76 / MM / MM / MM IL-LK-121 : LIBERTYVILLE 0.4 ESE * : 1.75 / MM / MM / MM IL-WN-50 : ROCKTON 3.1 SW * : 1.69 / 0.0 / 0.0 / MM IL-LK-54 : MUNDELEIN 0.5 NNE * : 1.67 / MM / MM / MM IL-CK-75 : ELK GROVE VILLAGE 2.2 WSW* : 1.60 / MM / MM / MM IL-LK-112 : LINDENHURST 1.0 ENE * : 1.60 / MM / MM / MM IL-CK-106 : HOFFMAN ESTATES 4.6 W * : 1.59 / MM / MM / MM IL-KN-9 : ELGIN 1.0 S * : 1.59 / 0.0 / 0.0 / MM IL-LK-42 : GURNEE 1.6 W * : 1.58 / MM / MM / MM IL-LK-27 : WINTHROP HARBOR 0.7 SSW * : 1.58 / MM / MM / MM IL-BN-20 : CALEDONIA 1.4 W * : 1.57 / MM / MM / MM IL-LK-87 : LAKE ZURICH 1.3 N * : 1.57 / MM / MM / MM IL-KN-118 : SLEEPY HOLLOW 0.7 W * : 1.56 / MM / MM / MM IL-LK-78 : LIBERTYVILLE 1.8 ESE * : 1.55 / MM / MM / MM IL-CK-278 : HOFFMAN ESTATES 1.6 SE * : 1.51 / MM / MM / MM IL-CK-346 : PALATINE 1.2 NW * : 1.50 / MM / MM / MM IL-CK-294 : PALATINE 1.4 NNE * : 1.49 / MM / MM / MM IL-CK-192 : PARK RIDGE 0.7 WNW * : 1.42 / MM / MM / MM IL-CK-334 : EVANSTON 0.6 S * : 1.39 / MM / MM / MM IL-CK-180 : PARK RIDGE 0.5 SSW * : 1.38 / MM / MM / MM IL-CK-336 : EVANSTON 0.8 ESE * : 1.36 / 0.0 / 0.0 / 0.00 IL-LK-19 : WAUKEGAN 2.2 N * : 1.36 / MM / MM / MM IL-LK-16 : BUFFALO GROVE 1.5 N * : 1.32 / MM / MM / MM IL-CK-367 : MOUNT PROSPECT 0.2 NNE * : 1.32 / MM / MM / MM IL-CK-63 : ELK GROVE VILLAGE 0.6 ESE* : 1.29 / MM / MM / MM IL-CK-321 : EVANSTON 0.9 S * : 1.27 / MM / MM / MM IL-CK-121 : PALATINE 1.3 E * : 1.26 / 0.0 / 0.0 / MM IL-DP-155 : MEDINAH 1.0 SSW * : 1.25 / 0.0 / 0.0 / 0.00 IL-CK-331 : NORTHFIELD 0.3 S * : 1.19 / MM / MM / MM IL-CK-193 : WINNETKA 0.8 ESE * : 1.18 / MM / MM / MM IL-LK-103 : BUFFALO GROVE 1.3 ESE * : 1.14 / MM / MM / MM IL-LK-23 : WINTHROP HARBOR 0.2 SSE * : 1.12 / MM / MM / MM IL-CK-326 : MORTON GROVE 1.2 WNW * : 1.05 / MM / MM / MM IL-CK-131 : SCHAUMBURG 2.0 E * : 1.05 / MM / MM / MM IL-CK-325 : MOUNT PROSPECT 1.3 SSE * : 0.99 / MM / MM / MM IL-LK-118 : HIGHLAND PARK 2.1 WNW * : 0.97 / MM / MM / MM IL-LK-39 : RIVERWOODS 0.4 ENE * : 0.91 / MM / MM / MM IL-CK-53 : GLENCOE 0.1 NW * : 0.88 / MM / MM / MM IL-CK-285 : HARWOOD HEIGHTS 0.4 NNE * : 0.84 / MM / MM / MM IL-LK-15 : BANNOCKBURN 0.5 ESE * : 0.81 / MM / MM / MM IL-CK-94 : LINCOLNWOOD 1.8 E * : 0.78 / MM / MM / MM IL-KN-130 : ST. CHARLES 0.2 NNW * : 0.77 / MM / MM / MM IL-KD-119 : YORKVILLE 2.3 NNE * : 0.70 / MM / MM / MM IL-DP-117 : ELMHURST 2.0 SE * : 0.64 / MM / MM / MM IL-CK-214 : ROGERS PARK 1.5 SW * : 0.64 / MM / MM / MM IL-DP-42 : CAROL STREAM 0.3 SSE * : 0.64 / MM / MM / MM IL-DP-40 : LOMBARD 1.0 NNW * : 0.63 / MM / MM / MM IL-DP-150 : BLOOMINGDALE 1.2 ESE * : 0.63 / MM / MM / MM IL-CK-345 : FRANKLIN PARK 0.5 SSE * : 0.58 / MM / MM / MM IL-KN-96 : ELBURN 0.3 NW * : 0.58 / MM / MM / MM IL-DP-173 : LOMBARD 1.2 N * : 0.56 / MM / MM / MM IL-KN-121 : GENEVA 1.3 NW * : 0.56 / 0.0 / 0.0 / 0.00 IL-DP-132 : WHEATON 2.0 NNE * : 0.53 / 0.0 / 0.0 / 0.00 IL-KN-134 : MAPLE PARK 3.9 S * : 0.52 / MM / MM / MM IL-DP-163 : LOMBARD 1.2 E * : 0.52 / MM / MM / MM IL-DK-36 : DE KALB 3.5 WSW * : 0.47 / MM / MM / MM IL-WL-73 : WILMINGTON 2.6 SE * : 0.44 / MM / MM / MM IL-KN-119 : MAPLE PARK 3.1 SE * : 0.43 / MM / MM / MM IL-LS-49 : NORTH UTICA 6.3 N * : 0.38 / MM / MM / MM IL-KN-133 : GENEVA 0.9 E * : 0.37 / MM / MM / MM IL-KD-106 : YORKVILLE 2.8 NE * : 0.37 / MM / MM / MM IL-LS-57 : MENDOTA 0.4 ENE * : 0.35 / MM / MM / MM IL-DP-38 : ELMHURST 0.4 SW * : 0.33 / MM / MM / MM IL-CK-74 : OAK PARK 1.3 NNE * : 0.32 / 0.0 / MM / MM IL-DP-27 : NAPERVILLE 2.1 ESE * : 0.32 / MM / MM / MM IL-KN-78 : GENEVA 1.3 SSW * : 0.32 / 0.0 / 0.0 / 0.00 IL-CK-361 : GLENVIEW 0.7 SE * : 0.31 / MM / MM / MM IL-DP-172 : WEST CHICAGO 3.0 SSE * : 0.31 / MM / MM / MM IL-CK-61 : OAK PARK 1.0 SW * : 0.30 / MM / MM / MM IL-KN-128 : BATAVIA 3.4 WSW * : 0.30 / MM / MM / MM IL-CK-323 : CHICAGO 6.8 NW * : 0.29 / MM / MM / MM IL-DP-176 : WINFIELD 0.6 SSW * : 0.29 / MM / MM / MM IL-KN-127 : GENEVA 0.6 SSE * : 0.28 / MM / MM / MM IL-KN-104 : GENEVA 3.9 WSW * : 0.28 / 0.0 / 0.0 / 0.00 IL-DP-30 : LISLE 0.5 WSW * : 0.27 / MM / MM / MM IL-DP-175 : NAPERVILLE 0.9 ENE * : 0.27 / MM / MM / MM IL-KN-22 : GENEVA 1.0 SSW * : 0.27 / MM / MM / MM IL-WL-42 : MOKENA 1.3 W * : 0.26 / MM / MM / MM IL-WL-164 : WILMINGTON 0.9 ENE * : 0.26 / MM / MM / MM IL-DP-101 : AURORA 3.8 SE * : 0.26 / 0.0 / 0.0 / 0.00 IL-KN-23 : BATAVIA 1.5 WNW * : 0.25 / MM / MM / MM IL-KD-5 : MONTGOMERY 0.8 SSE * : 0.24 / MM / MM / MM IL-KD-109 : YORKVILLE 1.0 N * : 0.24 / MM / MM / MM IL-WL-79 : PEOTONE 0.5 SE * : 0.24 / MM / MM / MM IL-WL-97 : NEW LENOX 3.3 E * : 0.23 / 0.0 / 0.0 / 0.00 IL-DP-16 : AURORA 3.6 SE * : 0.23 / MM / MM / MM IL-KN-33 : NORTH AURORA 1.5 NE * : 0.23 / MM / MM / MM IL-CK-366 : OAK PARK 1.0 NNE * : 0.23 / MM / MM / MM IL-DP-164 : WEST CHICAGO 3.5 SE * : 0.22 / MM / MM / MM IL-DP-156 : NAPERVILLE 0.5 NW * : 0.22 / MM / MM / MM IL-CK-145 : OAK PARK 1.5 S * : 0.21 / MM / MM / MM IL-WL-25 : CRETE 2.6 E * : 0.21 / MM / MM / MM IL-DP-49 : NAPERVILLE 2.5 ESE * : 0.20 / MM / MM / MM IL-KD-102 : OSWEGO 2.4 SSW * : 0.20 / 0.0 / 0.0 / MM IL-CK-32 : CHICAGO 6.4 NNE * : 0.20 / MM / MM / MM IL-WL-121 : MONEE 4.9 W * : 0.20 / MM / MM / MM IL-CK-12 : BRIDGEVIEW 1.3 NNW * : 0.20 / MM / MM / MM IL-DK-29 : EARLVILLE 4.8 NNE * : 0.20 / MM / MM / MM IL-CK-152 : CHICAGO RIDGE 0.2 WSW * : 0.20 / MM / MM / MM IL-KN-5 : BATAVIA 0.7 WSW * : 0.19 / 0.0 / 0.0 / MM IL-KN-135 : BATAVIA 0.8 W * : 0.19 / MM / MM / MM IL-CK-316 : OAK LAWN 0.8 WSW * : 0.18 / MM / MM / MM IL-WL-26 : MANHATTAN 0.8 ESE * : 0.18 / MM / MM / MM IL-KD-110 : YORKVILLE 0.9 SSW * : 0.17 / MM / MM / MM IL-CK-139 : OAK LAWN 1.1 N * : 0.17 / MM / MM / MM IL-DP-139 : WESTMONT 1.1 SSW * : 0.16 / MM / MM / MM IL-FD-9 : GIBSON CITY 3.0 WNW * : 0.16 / MM / MM / MM IL-DP-78 : NAPERVILLE 2.4 SE * : 0.16 / MM / MM / MM IL-KD-7 : PLANO 0.4 NNE * : 0.15 / MM / MM / MM IL-WL-72 : NEW LENOX 2.9 ENE * : 0.15 / MM / MM / MM IL-KN-51 : SUGAR GROVE 1.4 ENE * : 0.15 / MM / MM / MM IL-DP-57 : AURORA 3.5 NE * : 0.15 / MM / MM / MM IL-WL-99 : MANHATTAN 1.9 SE * : 0.14 / MM / MM / MM IL-WL-142 : MOKENA 3.4 WNW * : 0.14 / MM / MM / MM IL-CK-306 : OAK FOREST 0.6 N * : 0.14 / 0.0 / 0.0 / MM IL-DK-5 : CORTLAND 0.3 SSW * : 0.13 / MM / MM / MM IL-KN-124 : AURORA 3.1 WSW * : 0.13 / MM / MM / MM IL-WL-92 : NAPERVILLE 4.0 SSW * : 0.13 / MM / MM / MM IL-CK-211 : OAK LAWN 1.6 WNW * : 0.12 / MM / MM / MM IL-KN-123 : AURORA 2.8 WSW * : 0.12 / 0.0 / MM / MM IL-CK-64 : HOMEWOOD 0.1 ESE * : 0.11 / MM / MM / MM IL-CK-69 : PARK FOREST 0.8 NNE * : 0.11 / MM / MM / MM IL-GY-37 : MAZON 2.4 SE * : 0.11 / MM / MM / MM IL-KN-4 : SUGAR GROVE 0.7 NE * : 0.11 / MM / MM / MM IL-LE-22 : AMBOY 0.5 SSW * : 0.11 / 0.0 / 0.0 / 0.00 IL-CK-229 : FLOSSMOOR 1.2 ESE * : 0.10 / MM / MM / MM IL-WL-147 : NEW LENOX 2.0 ESE * : 0.10 / MM / MM / MM IL-CK-14 : CHICAGO 5.5 ESE * : 0.10 / MM / MM / MM IL-CK-355 : LA GRANGE 0.3 ENE * : 0.10 / MM / MM / MM IL-KD-107 : YORKVILLE 2.1 NNW * : 0.10 / MM / MM / MM IL-CK-98 : LA GRANGE PARK 0.7 SSW * : 0.10 / MM / MM / MM IL-CK-253 : MIDLOTHIAN 0.1 SSE * : 0.09 / MM / MM / MM IL-WL-159 : NEW LENOX 2.1 S * : 0.09 / MM / MM / MM IL-WL-63 : NEW LENOX 1.8 SE * : 0.09 / MM / MM / MM IL-LS-1 : OTTAWA 1.3 NW * : 0.09 / MM / MM / MM IL-DK-38 : CORTLAND 0.3 E * : 0.09 / MM / MM / MM IL-LS-34 : LA SALLE 0.1 W * : 0.09 / MM / MM / MM IL-DP-102 : BOLINGBROOK 2.7 NE * : 0.09 / MM / MM / MM IL-CK-149 : OAK LAWN 0.5 SSW * : 0.09 / MM / MM / MM IL-WL-149 : BULT FIELD-MONEE 4.9 SE * : 0.09 / 0.0 / 0.0 / MM IL-IR-16 : CISSNA PARK 0.6 S * : 0.08 / MM / MM / MM IL-IR-21 : CLIFTON 0.5 WNW * : 0.07 / MM / MM / MM IL-DP-174 : BOLINGBROOK 2.6 NE * : 0.07 / MM / MM / MM IL-IR-24 : CLIFTON 3.9 ESE * : 0.07 / MM / MM / MM IL-LS-60 : PERU 0.7 ENE * : 0.07 / MM / MM / MM IL-WL-61 : CHANNAHON 0.8 NNE * : 0.06 / MM / MM / MM IL-LS-39 : OTTAWA 0.5 NNW * : 0.06 / MM / MM / MM IL-CK-320 : PARK FOREST 0.7 WNW * : 0.06 / MM / MM / MM IL-KK-44 : KANKAKEE 4.8 NW * : 0.06 / MM / MM / MM IL-LE-8 : ASHTON 0.4 SSW * : 0.05 / 0.0 / 0.0 / 0.00 IL-GY-1 : CARBON HILL 3.1 N * : 0.05 / 0.0 / 0.0 / MM IL-FD-10 : GIBSON CITY 6.5 NE * : 0.05 / MM / MM / MM IL-LS-17 : OTTAWA 1.6 N * : 0.05 / 0.0 / MM / MM IL-GY-34 : MORRIS 4.5 NW * : 0.04 / MM / MM / MM IL-WL-20 : MANHATTAN 4.7 ENE * : 0.04 / 0.0 / 0.0 / MM IL-CK-88 : COUNTRYSIDE 0.8 ENE * : 0.04 / MM / MM / MM IL-GY-28 : MORRIS 1.5 SW * : 0.04 / MM / MM / MM IL-GY-20 : MORRIS 2.5 SSE * : 0.04 / MM / MM / MM IL-WL-165 : FRANKFORT 1.3 ESE * : 0.04 / MM / MM / MM IL-GY-10 : MINOOKA 0.3 NE * : 0.03 / MM / MM / MM IL-WL-100 : JOLIET 2.9 WNW * : 0.03 / MM / MM / MM IL-LS-50 : SENECA 1.2 NNE * : 0.03 / MM / MM / MM IL-IR-22 : CHEBANSE 1.6 SW * : 0.03 / MM / MM / MM IL-GY-16 : MORRIS 6.4 ESE * : 0.03 / MM / MM / MM IL-GY-27 : MORRIS 5.9 ESE * : 0.03 / MM / MM / MM IL-CK-358 : BURR RIDGE 1.0 ENE * : 0.03 / MM / MM / MM IL-KN-125 : MAPLE PARK 0.1 S * : 0.03 / MM / MM / MM IL-KD-24 : OSWEGO 5.0 SSE * : 0.03 / MM / MM / MM IL-WL-51 : PLAINFIELD 2.4 SSE * : 0.03 / MM / MM / MM IL-KD-111 : YORKVILLE 3.1 N * : 0.03 / MM / MM / MM IL-GY-11 : MORRIS 4.8 NNW * : 0.03 / MM / MM / MM IL-LV-6 : PONTIAC 1.0 SE * : 0.02 / MM / MM / MM IL-WL-173 : LOCKPORT 5.0 W * : 0.02 / MM / MM / MM IL-IR-14 : WATSEKA 6.9 WNW * : 0.02 / MM / MM / MM IL-IR-20 : CHEBANSE 0.6 SSW * : 0.02 / MM / MM / MM IL-WL-23 : BEECHER 3.4 SSE * : 0.02 / MM / MM / MM IL-KK-45 : KANKAKEE 1.4 WSW * : 0.02 / MM / MM / MM IL-DP-79 : BURR RIDGE 1.9 SW * : 0.02 / MM / MM / MM IL-WL-67 : CHANNAHON 2.5 SSE * : 0.02 / MM / MM / MM IL-KD-34 : PLAINFIELD 4.8 SW * : 0.01 / 0.0 / 0.0 / MM IL-WL-131 : HOMER GLEN 0.7 NNE * : 0.01 / MM / MM / MM IL-WL-80 : LOCKPORT 1.3 SE * : 0.01 / MM / MM / MM IL-CK-342 : MERRIONETTE PARK 1.7 NE * : 0.01 / MM / MM / MM IL-WL-174 : JOLIET 0.8 E * : 0.01 / MM / MM / MM IL-KK-39 : HERSCHER 3.3 E * : 0.01 / 0.0 / 0.0 / MM IL-KK-42 : CHEBANSE 0.8 ENE * : 0.01 / MM / MM / MM IL-IR-2 : ASHKUM 5.6 E * : T / MM / MM / MM IL-WL-172 : JOLIET 2.0 WNW * : T / MM / MM / MM IL-LV-17 : EMINGTON 2.2 SSE * : T / MM / MM / MM IL-LE-10 : DIXON 3.0 NNW * : 0.00 / 0.0 / MM / MM IL-WL-16 : HOMER GLEN 0.8 ENE * : 0.00 / 0.0 / MM / MM IL-WL-175 : JOLIET 0.7 WNW * : 0.00 / 0.0 / MM / MM :COCORAHS PRECIPITATION REPORTS IN INDIANA : SNOW SNOW WATER : PCPN FALL DEPTH EQUIV IN-PT-63 : VALPARAISO 1.8 NW * : 0.59 / 0.0 / 0.0 / 0.00 IN-PT-91 : CHESTERTON 4.2 E * : 0.58 / MM / MM / MM IN-PT-171 : VALPARAISO 2.5 N * : 0.58 / MM / MM / MM IN-PT-172 : PORTER 0.5 S * : 0.49 / MM / MM / MM IN-PT-134 : VALPARAISO 1.7 N * : 0.49 / MM / MM / MM IN-PT-165 : VALPARAISO 2.6 WNW * : 0.47 / MM / MM / MM IN-PT-133 : VALPARAISO 2.2 WNW * : 0.45 / MM / MM / MM IN-PT-69 : PORTER 0.6 S * : 0.42 / MM / MM / MM IN-PT-12 : VALPARAISO 4.3 SW * : 0.39 / MM / MM / MM IN-PT-159 : CHESTERTON 3.9 ESE * : 0.38 / MM / MM / MM IN-PT-98 : VALPARAISO 0.9 NNW * : 0.33 / 0.0 / 0.0 / 0.00 IN-LK-114 : HOBART 2.0 NNW * : 0.33 / MM / MM / MM IN-PT-92 : HEBRON 1.2 NW * : 0.33 / MM / MM / MM IN-LK-50 : HOBART 1.6 E * : 0.33 / MM / MM / MM IN-LK-15 : DYER 1.0 WNW * : 0.30 / MM / MM / MM IN-PT-157 : PORTAGE 2.4 NNW * : 0.30 / MM / MM / MM IN-LK-94 : GRIFFITH 1.2 N * : 0.27 / MM / MM / MM IN-LK-115 : GARY 5.9 ENE * : 0.26 / MM / MM / MM IN-LK-67 : SCHERERVILLE 1.1 E * : 0.24 / MM / MM / MM IN-LK-111 : HOBART 1.1 S * : 0.23 / MM / MM / MM IN-LK-78 : SCHERERVILLE 1.4 E * : 0.22 / MM / MM / MM IN-PT-80 : PORTAGE 2.8 E * : 0.22 / MM / MM / MM IN-PT-8 : VALPARAISO 0.6 SE * : 0.21 / MM / MM / MM IN-LK-91 : MUNSTER 1.5 NNW * : 0.20 / MM / MM / MM IN-LK-26 : CROWN POINT 1.1 N * : 0.19 / MM / MM / MM IN-PT-18 : HEBRON 3.7 NE * : 0.17 / MM / MM / MM IN-LK-86 : HEBRON 3.0 SSW * : 0.16 / MM / MM / MM IN-LK-63 : GARY 4.8 ENE * : 0.13 / 0.0 / MM / MM IN-PT-117 : VALPARAISO 5.5 SSW * : 0.09 / MM / MM / MM IN-JS-1 : WHEATFIELD 2.8 S * : 0.08 / MM / MM / MM IN-JS-43 : RENSSELAER 10.5 NNE * : 0.07 / MM / MM / MM IN-JS-49 : DE MOTTE 4.1 SW * : 0.07 / MM / MM / MM IN-LK-107 : LOWELL 3.1 NNW * : 0.06 / MM / MM / MM IN-LK-89 : HAMMOND 0.6 SSW * : 0.05 / MM / MM / MM IN-JS-46 : WHEATFIELD 4.6 W * : 0.05 / MM / MM / MM IN-LK-85 : HEBRON 6.0 SSW * : 0.04 / MM / MM / MM IN-LK-99 : ST. JOHN 2.8 SE * : 0.04 / MM / MM / MM IN-JS-36 : DE MOTTE 1.3 SW * : 0.04 / MM / MM / MM IN-JS-45 : DE MOTTE 1.2 SSW * : 0.03 / MM / MM / MM IN-JS-37 : DE MOTTE 0.8 NNW * : 0.02 / MM / MM / MM IN-JS-56 : RENSSELAER 1.9 N * : 0.00 / 0.0 / MM / MM IN-NW-3 : KENTLAND 0.3 ENE * : 0.00 / 0.0 / MM / MM IN-NW-6 : KENTLAND 1.7 SSE * : 0.00 / 0.0 / MM / MM IN-JS-7 : RENSSELAER 1.9 SSW * : 0.00 / 0.0 / MM / MM IN-JS-54 : RENSSELAER 4.3 N * : 0.00 / 0.0 / MM / MM $$
Environment
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| Vertical sounding at Lincoln, Illinois taken at 7 PM on August 9th indicating considerable instability. Effective SRH--a measure of 'spin' available for storms--is 280 m2/s2, sufficiently high to support tornadoes. | Mixed Layer CAPE analysis from the SPC mesoanalysis valid at 5 PM. | Effective Significant Tornado Parameter from the SPC mesoanalysis. Values above 1-2 suggest an environment conducive for tornadic thunderstorms. |
Additional Info
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Media use of NWS Web News Stories is encouraged! Please acknowledge the NWS as the source of any news information accessed from this site. Additional recaps can be found on the NWS Chicago Past Events Page |
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