Alert archive / Illinois / Flash Flood Warnings in 2007
Flash Flood Warning 21, NWS Chicago, IL
NWS Chicago, IL issued this flash flood warning at Jul 18, 2007, 4:22 AM CDT for LaSalle County, Illinois. It was in force for 6 hr. 3 reports 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
- Jul 18, 2007, 4:22 AM CDT (09:22 UTC)
- Expired
- Jul 18, 2007, 10:15 AM CDT
- In force
- 6 hr
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
County LaSalle County, IL
The radar
The Chicago radar (KLOT), 73 km from the middle of the area, began a volume at 09:22 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 |
|---|---|---|---|
| Jul 18, 7:00 AM CDT | HEAVY RAIN 3.05 | Peru, IL | |
| Jul 18, 7:00 AM CDT | HEAVY RAIN 3.18 | 1 N Mendota, IL | |
| Jul 18, 8:30 AM CDT | HEAVY RAIN 2.55 | 1 Ese Streator, IL | PRECIPITATION RECORDED SINCE MIDNIGHT. DRY CREEK BED HAS RISEN TO 16 INCHES OF FLOWING WATER. COCORAH OBSERVER. |
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, 9.4 hours before the alert went out and 135 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
- 46 J/kg
- Mixed-layer CIN
- -310 J/kg
- Mixed-layer LCL
- 1165 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 124 m²/s²
- 0-3 km storm-relative helicity
- 119 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS53 KLOT 180923 FFWLOT ILC099-181515- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 422 AM CDT WED JUL 18 2007 THE NATIONAL WEATHER SERVICE IN ROMEOVILLE HAS ISSUED A * FLASH FLOOD WARNING FOR... WESTERN LA SALLE COUNTY IN NORTH CENTRAL ILLINOIS... * UNTIL 1015 AM CDT... * AT 414 AM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY RAIN OVER WESTERN LA SALLE COUNTY. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MENDOTA...TROY GROVE...LA SALLE AND UTICA. DOPPLER RADAR AND RAINFALL REPORTS SHOW THAT ONE AND A HALF TO TWO INCHES OF RAIN FELL ACROSS WESTERN LA SALLE COUNTY EARLIER THIS MORNING. ANOTHER BAND OF THUNDERSTORMS IN WESTERN LA SALLE COUNTY WILL PRODUCE ANOTHER INCH TO 3 INCHES OF RAINFALL. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. 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. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. FIND AN ALTERNATE ROUTE. LAT...LON 4162 8916 4111 8917 4112 8883 4156 8886 $$ HALBACH
3 follow-up statements
000 WGUS73 KLOT 181209 FFSLOT FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 705 AM CDT WED JUL 18 2007 ILC099-181515- LA SALLE IL- 705 AM CDT WED JUL 18 2007 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 AM CDT FOR WESTERN LA SALLE COUNTY... AT 659 AM CDT...RUNOFF CONTINUES FROM HEAVY RAINFALL OVERNIGHT. RADAR ESTIMATED THAT BETWEEN 2 AND 4 INCHES OF RAIN FELL OVER PORTIONS OF WESTERN LASALLE COUNTY MOSTLY ALONG AND WEST OF A LINE FROM MENDOTA TO LEONORE. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND. LAT...LON 4162 8916 4111 8917 4112 8883 4156 8886 $$ WDM
000 WGUS73 KLOT 181409 FFSLOT FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 903 AM CDT WED JUL 18 2007 ILC099-181515- LA SALLE IL- 903 AM CDT WED JUL 18 2007 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 AM CDT FOR WESTERN LA SALLE COUNTY... AT 903 AM CDT...RUNOFF CONTINUES FROM HEAVY RAINFALL OVERNIGHT. RUNOFF WILL LIKELY CONTINUE FOR AT LEAST ANOTHER HOUR. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND. LAT...LON 4162 8916 4111 8917 4112 8883 4156 8886 $$ WDM
000 WGUS73 KLOT 181513 FFSLOT FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 1010 AM CDT WED JUL 18 2007 ILC099-181520- LA SALLE IL- 1010 AM CDT WED JUL 18 2007 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 1015 AM CDT FOR WESTERN LA SALLE COUNTY. RAINFALL HAS ENDED OVER THE COUNTY AND NO ADDITIONAL FLOODING HAS BEEN REPORTED. ADDITIONAL THUNDERSTORMS THAT MAY PRODUCE HEAVY RAINFALL AND FLOODING ARE POSSIBLE LATE THIS AFTERNOON AND TONIGHT. LAT...LON 4162 8916 4111 8917 4112 8883 4156 8886 $$ WDM
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 12:13 AM CDT | Severe Thunderstorm Warning | LOT | Lee, Ogle | 62 min |
| Jul 18, 12:49 AM CDT | Flash Flood Warning | LOT | Lee | 6 hr |
| Jul 18, 3:24 AM CDT | Severe Thunderstorm Warning | LOT | Ford, Livingston | 36 min |
| Jul 18, 3:31 AM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 44 min |
| Jul 18, 7:20 AM CDT | Flash Flood Warning | LOT | Livingston | 6 hr |
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.