Alert archive / Illinois / Flash Flood Warnings in 2007
Flash Flood Warning 36, NWS Chicago, IL
NWS Chicago, IL issued this flash flood warning at Aug 22, 2007, 10:42 PM CDT for Cook County, Will County, Illinois. It took effect at Aug 22, 2007, 10:47 PM CDT. It was in force for 4 hr. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 22, 2007, 10:42 PM CDT (03:42 UTC)
- In effect from
- Aug 22, 2007, 10:47 PM CDT
- Expired
- Aug 23, 2007, 2:45 AM CDT
- In force
- 4 hr
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
Counties Cook County, IL, Will County, IL
The radar
The Chicago radar (KLOT), 24 km from the middle of the area, began a volume at 03:42 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 22, 11:06 PM CDT | FLASH FLOOD | Chicago, IL | NORTHBOUND MICHIGAN AVE ENTRANCE TUNNEL TO NORTHBOUND LAKE SHORE DR IS FLOODED. CHICAGO POLICE ONSCENE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 3.7 hours before the alert went out and 182 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1568 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 1750 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 91 m²/s²
- 0-3 km storm-relative helicity
- 195 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 6.6
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS53 KLOT 230347
FFWLOT
ILC031-197-230745-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1042 PM CDT WED AUG 22 2007
THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHERN COOK COUNTY IN NORTHEAST ILLINOIS...
WILL COUNTY IN NORTHEAST ILLINOIS...
* UNTIL 245 AM CDT...
* AT 1038 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED RAINFALL
TOTALS OF AROUND 1 INCH SINCE 930 PM CDT FROM NORTHERN WILL COUNTY
THROUGH SOUTHERN COOK COUNTY. THUNDERSTORMS WILL CONTINUE TO PASS
THROUGH THE SAME LOCATIONS THROUGH MIDNIGHT PRODUCING ADDITIONAL
HEAVY RAINFALL OF 1 TO 2 INCHES.
DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN
DEPTH BY FOOT OR BY AUTOMOBILE.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
LAT...LON 4163 8826 4121 8826 4122 8804 4131 8801
4130 8755 4172 8754 4188 8763 4187 8791
4172 8790
$$
MARSILI4 follow-up statements
000
WGUS73 KLOT 230432
FFSLOT
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1123 PM CDT WED AUG 22 2007
ILC031-197-230745-
COOK IL-WILL IL-
1123 PM CDT WED AUG 22 2007
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM CDT FOR WILL
AND SOUTHERN AND CENTRAL COOK COUNTIES...
AT 1123 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE SHOWERS AND THUNDERSTORMS ACROSS THE WARNED AREA. RADAR
ESTIMATES THAT BETWEEN ONE AND TWO INCHES OF RAIN HAS FALLEN ACROSS
THE SOUTHERN HALF OF COOK COUNTY SINCE 1020 PM CDT. THUNDERSTORMS
WILL CONTINUE THROUGH 1 AM CDT...PRODUCING UP TO ANOTHER INCH OF
RAIN. RUNOFF FROM THESE THUNDERSTORMS WILL CONTINUE TO POSE A THREAT
FOR FLASH FLOODING EVEN WHEN THE RAIN DECREASES IN INTENSITY AFTER 1
AM CDT.
AT 1106 PM CDT...MEDIA REPORTS INDICATED THE NORTHBOUND MICHIGAN
AVENUE ENTRANCE TUNNEL TO NORTHBOUND LAKE SHORE DRIVE WAS FLOODED.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
LAT...LON 4163 8826 4121 8826 4122 8804 4131 8801
4130 8755 4172 8754 4188 8763 4187 8791
4172 8790
$$
MARSILI000
WGUS73 KLOT 230537
FFSLOT
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1237 AM CDT THU AUG 23 2007
ILC031-197-230745-
COOK IL-WILL IL-
1237 AM CDT THU AUG 23 2007
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM CDT FOR WILL
AND SOUTHERN AND CENTRAL COOK COUNTIES...
AT 1237 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED
TO INDICATE LIGHT TO MODERATE RAIN ACROSS THE WARNED AREA. RADAR
ESTIMATES THAT UP TO TWO INCHES OF RAIN HAS FALLEN ACROSS PARTS OF
SOUTHERN COOK COUNTY. THE RAIN WILL BEGIN TO TAPER OFF AFTER 1 AM
THIS MORNING.
AT 1106 PM CDT...MEDIA REPORTS INDICATED THE NORTHBOUND MICHIGAN
AVENUE ENTRANCE TUNNEL TO NORTHBOUND LAKE SHORE DRIVE WAS FLOODED.
AREAS OF STANDING WATER AND FLOOD WATERS WILL SLOWLY RECEDE DURING
THE EARLY MORNING HOURS.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
LAT...LON 4163 8826 4121 8826 4122 8804 4131 8801
4130 8755 4172 8754 4188 8763 4187 8791
4172 8790
$$000
WGUS73 KLOT 230640
FFSLOT
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
140 AM CDT THU AUG 23 2007
ILC031-197-230745-
COOK IL-WILL IL-
140 AM CDT THU AUG 23 2007
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM CDT FOR WILL
AND SOUTHERN AND CENTRAL COOK COUNTIES...
AT 140 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
LIGHT RAIN WAS FALLING ACROSS SOUTHEAST COOK COUNTY AND EASTERN WILL
COUNTY. THE RAIN WILL END BY 215 AM. RADAR ESTIMATES THAT UP TO TWO
INCHES OF RAIN HAS FALLEN ACROSS PARTS OF SOUTHERN COOK COUNTY AND
CENTRAL WILL COUNTY.
AT 1106 PM CDT...MEDIA REPORTS INDICATED THE NORTHBOUND MICHIGAN
AVENUE ENTRANCE TUNNEL TO NORTHBOUND LAKE SHORE DRIVE WAS FLOODED.
AREAS OF STANDING WATER AND FLOOD WATERS WILL SLOWLY RECEDE DURING
THE EARLY MORNING HOURS. HOWEVER...NEW SHOWERS AND THUNDERSTORMS
WERE DEVELOPING ACROSS WESTERN ILLINOIS...AND THIS ACTIVITY WILL
LIKELY MOVE EAST ACROSS AREAS NORTH OF INTERSTATE 80...LATER THIS
MORNING TOWARD SUNRISE.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
LAT...LON 4163 8826 4121 8826 4122 8804 4131 8801
4130 8755 4172 8754 4188 8763 4187 8791
4172 8790
$$000
WGUS73 KLOT 230747
FFSLOT
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
243 AM CDT THU AUG 23 2007
ILC031-197-230758-
COOK IL-WILL IL-
243 AM CDT THU AUG 23 2007
...A FLASH FLOOD WARNING FOR WILL AND SOUTHERN AND CENTRAL COOK
COUNTIES WILL BE ALLOWED TO EXPIRE...
THE THUNDERSTORMS EARLIER THIS EVENING HAVE MOVE EAST. THE WATER HAS
RECEDED IN MAY AREAS. THIS WARNING WILL BE ALLOWED TO EXPIRE.
BE ALERT THIS MORNING FOR FLOODING MORE THUNDERSTORMS ARE MOVING
INTO THE AREA AND ANOTHER FLASH FLOOD WARNING MAY BE NEEDED.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
LAT...LON 4163 8826 4121 8826 4122 8804 4131 8801
4130 8755 4172 8754 4188 8763 4187 8791
4172 8790
$$What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
Hazardous weather outlook, Aug 22, 4:30 PM CDT, 6 hours 12 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 430 PM CDT WED AUG 22 2007 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 230945- WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE- DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON- IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON- 430 PM CDT WED AUG 22 2007 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA. .DAY ONE...TONIGHT. SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS EVENING...WITH THE GREATEST COVERAGE OF THESE THUNDERSTORMS EXPECTED CLOSER TO THE ILLINOIS WISCONSIN STATELINE. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS...MAINLY THIS EVENING...GENERALLY NORTH OF A LINE DIXON TO DEKALB TO WAUKEGAN. THE MAIN THREAT WILL BE DAMAGING WINDS. THERE IS A POTENTIAL FOR HEAVY RAINFALL TONIGHT...ESPECIALLY CLOSER TO THE ILLINOIS WISCONSIN STATELINE. GIVEN SATURATED SOIL CONDITIONS FROM THE RECENT HEAVY RAINS...ADDITIONAL HEAVY RAINFALL TONIGHT MAY LEAD TO FLOODING PROBLEMS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. THERE IS A GOOD CHANCE OF PERIODIC THUNDERSTORMS THURSDAY THROUGH FRIDAY NIGHT. HEAVY RAINFALL WILL BE POSSIBLE DURING THIS PERIOD. THERE IS THE POTENTIAL THAT STRONGER STORMS COULD PRODUCE DAMAGING WINDS OR LARGE HAIL. THERE IS ALSO THE POTENTIAL FOR ADDITIONAL SIGNIFICANT RAINFALL. GIVEN THE ALREADY SATURATED SOIL CONDITIONS FROM RECENT HEAVY RAINFALL...ANY AREAS THAT EXPERIENCE MULTIPLE ROUNDS OF HEAVY RAINFALL COULD EXPERIENCE SIGNIFICANT FLOODING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NECESSARY THIS EVENING ACROSS FAR NORTHERN ILLINOIS. IN ADDITION...ANY REPORTS OF RAINFALL AMOUNTS OR FLOODING WILL BE APPRECIATED TONIGHT THROUGH FRIDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ740>745-766-230945- WINTHROP HARBOR TO WILMETTE HARBOR IL- WILMETTE HARBOR TO NORTHERLY ISLAND IL- NORTHERLY ISLAND TO CALUMET HARBOR IL- CALUMET HARBOR IL TO GARY IN- GARY INDIANA TO BURNS HARBOR- BURNS HARBOR TO MICHIGAN CITY- LAKE MICHIGAN IL AND IN OPEN WATERS- 430 PM CDT WED AUG 22 2007 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS AND INDIANA WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. THERE IS A CHANCE OF THUNDERSTORMS TONIGHT. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. ONE OR MORE PERIODS OF THUNDERSTORMS CAN BE EXPECTED FROM THURSDAY THROUGH FRIDAY NIGHT...WITH THE POTENTIAL FOR THE STRONGER STORMS TO PRODUCE STRONG WIND GUSTS. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO
In the hours before
Local storm report, Aug 22, 9:42 PM CDT, 1 hour before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
942 PM CDT WED AUG 22 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0925 PM TSTM WND GST MARSEILLES 41.33N 88.69W
08/22/2007 M58.00 MPH LA SALLE IL MESONET
0939 PM TSTM WND GST SANDWICH 41.65N 88.62W
08/22/2007 M45.00 MPH DE KALB IL EMERGENCY MNGR
&&Local storm report, Aug 22, 10:00 PM CDT, 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1000 PM CDT WED AUG 22 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0925 PM TSTM WND DMG SHERIDAN 41.53N 88.69W
08/22/2007 LA SALLE IL EMERGENCY MNGR
ONE TREE BLOWN DOWN. ESTIMATE WINDS 60 MPH.
&&Local storm report, Aug 22, 10:06 PM CDT, 36 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1006 PM CDT WED AUG 22 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0957 PM TSTM WND DMG MORRIS 41.37N 88.43W
08/22/2007 GRUNDY IL PUBLIC
POWER LINES BLOWN DOWN AT ROUTE 47 AND LISBEN.
1003 PM HAIL NEW LENOX 41.52N 87.98W
08/22/2007 E0.25 INCH WILL IL TRAINED SPOTTER
1003 PM TSTM WND GST NEW LENOX 41.52N 87.98W
08/22/2007 E40.00 MPH WILL IL TRAINED SPOTTER
&&Local storm report, Aug 22, 10:29 PM CDT, 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1029 PM CDT WED AUG 22 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1010 PM TSTM WND GST ROMEOVILLE 41.65N 88.09W
08/22/2007 M40.00 MPH WILL IL OFFICIAL NWS OBS
1021 PM HAIL MATTESON 41.51N 87.74W
08/22/2007 M0.25 INCH COOK IL AMATEUR RADIO
1024 PM HAIL WOODRIDGE 41.74N 88.04W
08/22/2007 M0.50 INCH DUPAGE IL AMATEUR RADIO
MARBLE SIZE HAIL AT I-55 AND LEMONT ROAD.
&&Local storm report, Aug 22, 10:34 PM CDT, 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1034 PM CDT WED AUG 22 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 PM TSTM WND DMG POLO 41.98N 89.58W
08/22/2007 OGLE IL CO-OP OBSERVER
EIGHT INCH DIAMETER TREE LIMBS BLOWN DOWN.
&&Local storm report, Aug 22, 10:39 PM CDT, 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1039 PM CDT WED AUG 22 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1033 PM TSTM WND DMG MOKENA 41.53N 87.88W
08/22/2007 WILL IL LAW ENFORCEMENT
ONE TREE BLOWN DOWN AT ROUTE 30 AND WOLF ROAD.
&&The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 8:36 PM CDT | Severe Thunderstorm Warning | LOT | Lee | 54 min |
| Aug 22, 8:37 PM CDT | Severe Thunderstorm Warning | LOT | Ogle | 26 min |
| Aug 22, 8:47 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, LaSalle | 73 min |
| Aug 22, 9:22 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kendall | 38 min |
| Aug 22, 9:27 PM CDT | Severe Thunderstorm Warning | LOT | Kane | 48 min |
| Aug 22, 9:29 PM CDT | River Flood Warning | LOT | Winnebago | 9 days |
| Aug 22, 9:29 PM CDT | River Flood Warning | LOT | Winnebago | 25 hr |
| Aug 22, 9:42 PM CDT | Severe Thunderstorm Warning | LOT | Will | 93 min |
| Aug 22, 9:50 PM CDT | Flash Flood Warning | LOT | Grundy, Kendall, LaSalle | 4 hr |
| Aug 22, 10:02 PM CDT | Special Marine Warning | LOT | 118 min | |
| Aug 22, 10:06 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 66 min |
| Aug 22, 10:10 PM CDT | River Flood Advisory | LOT | LaSalle | 24 hr |
| Aug 23, 3:22 AM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Kane | 23 min |
| Aug 23, 4:15 AM CDT | Special Marine Warning | LOT | 45 min | |
| Aug 23, 10:58 AM CDT | River Flood Warning | LOT | Cook | 4 days |
| Aug 23, 12:57 PM CDT | Flash Flood Watch | LOT | Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more | 40 hr |
| Aug 23, 1:09 PM CDT | Severe Thunderstorm Warning | LOT | Lee, Ogle | 96 min |
| Aug 23, 1:45 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle, Livingston | 77 min |
| Aug 23, 1:47 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb | 58 min |
| Aug 23, 2:06 PM CDT | Severe Thunderstorm Warning | LOT | Kane | 75 min |
| Aug 23, 2:18 PM CDT | Special Marine Warning | LOT | 117 min | |
| Aug 23, 2:27 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kendall | 57 min |
| Aug 23, 2:29 PM CDT | Tornado Warning | LOT | DeKalb, Kane | 46 min |
| Aug 23, 2:31 PM CDT | Flash Flood Warning | LOT | Lee, Ogle | 3 hr |
| Aug 23, 2:40 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 95 min |
| Aug 23, 2:41 PM CDT | Severe Thunderstorm Warning | LOT | DuPage | 64 min |
| Aug 23, 2:57 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 78 min |
| Aug 23, 3:13 PM CDT | Tornado Warning | LOT | Cook, DuPage | 39 min |
| Aug 23, 3:23 PM CDT | Tornado Warning | LOT | Cook, Will | 29 min |
| Aug 23, 3:33 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee | 22 min |
| Aug 23, 4:48 PM CDT | Severe Thunderstorm Warning | LOT | Kane | 42 min |
| Aug 23, 4:53 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 67 min |
| Aug 23, 5:04 PM CDT | Flash Flood Warning | LOT | Cook, DeKalb, DuPage, Kane | 4 hr |
| Aug 23, 5:05 PM CDT | Severe Thunderstorm Warning | LOT | Lee | 39 min |
| Aug 23, 5:24 PM CDT | Special Marine Warning | LOT | 2 hr | |
| Aug 23, 5:34 PM CDT | Severe Thunderstorm Warning | LOT | DuPage, Kane | 54 min |
| Aug 23, 5:37 PM CDT | River Flood Warning | LOT | DeKalb | 3 days |
| Aug 23, 5:47 PM CDT | Severe Thunderstorm Warning | LOT | Kendall, LaSalle | 58 min |
| Aug 23, 6:21 PM CDT | Severe Thunderstorm Warning | LOT | Will | 54 min |
| Aug 23, 6:26 PM CDT | Flash Flood Warning | LOT | Grundy, Kendall, LaSalle, Will | 4 hr |
| Aug 23, 6:34 PM CDT | Special Marine Warning | LOT | 108 min | |
| Aug 23, 6:44 PM CDT | Flash Flood Warning | LOT | Cook | 4 hr |
| Aug 23, 6:44 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 61 min |
| Aug 23, 6:50 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kankakee, Will | 70 min |
Nearby
Flash Flood Warnings in Illinois, 2007Every flash flood warning in 2007
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.