Alert archive / Illinois / Severe Thunderstorm Warnings in 2004
Severe Thunderstorm Warning 62, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at May 21, 2004, 9:49 AM CDT for Lake County, Illinois. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 21, 2004, 9:49 AM CDT (14:49 UTC)
- Expired
- May 21, 2004, 10:15 AM CDT
- In force
- 26 min
- Issued by
- NWS Chicago, IL
- Area
- Counties, with a storm outline in the text
County Lake County, IL
The radar
The Chicago radar (KLOT), 85 km from the middle of the area, began a volume at 14:49 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 forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Chicago, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at May 21, 6:15 AM CDT, 3 hours 34 minutes earlier.
Area forecast discussion, May 21, 6:15 AM CDT, 3 hours 34 minutes before
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</html>Hazardous weather outlook, May 21, 6:00 AM CDT, 3 hours 49 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO IL 600 AM CDT FRI MAY 21 2004 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011- 019-221100- BENTON-BOONE-COOK-DE KALB-DU PAGE-FORD-GRUNDY-IROQUOIS-JASPER- KANE-KANKAKEE-KENDALL-LA SALLE-LAKE-LAKE IN-LEE-LIVINGSTON- MCHENRY-NEWTON-OGLE-PORTER-WILL-WINNEBAGO- 600 AM CDT FRI MAY 21 2004 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE ENTIRE AREA. A FRONTAL BOUNDARY EXTENDING FROM CENTRAL IOWA TO CENTRAL INDIANA WILL RETURN NORTHWARD AS A WARM FRONT TODAY. THIS FRONT WILL SEPARATE RELATIVELY COOL AIR TO THE NORTH FROM WARM AND STICKY AIR TO THE SOUTH. THE MAIN FOCUS FOR THUNDERSTORM DEVELOPMENT WILL BE TO THE NORTH OF THIS FRONT. HOWEVER...SCATTERED THUNDERSTORMS WILL LIKELY DEVELOP LATE THIS AFTERNOON AND TONIGHT...IN THE UNSTABLE AIR ALONG AND JUST SOUTH OF THIS BOUNDARY AS WELL. THE PRIMARY THREAT WITH STRONGER STORMS WILL BE LARGE HAIL AND THUNDERSTORM WIND GUSTS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS AGAIN SATURDAY AND SATURDAY NIGHT. IN ADDITION...A HEAVY RAINFALL POTENTIAL ALSO EXISTS FOR SATURDAY AFTERNOON AND SATURDAY NIGHT. THUNDERSTORMS MAY CONTINUE THROUGH SUNDAY...BEFORE A COLD FRONT PUSHES TROUGH THE MIDWEST AND TEMPORARILY ENDS THE STORM THREAT. THUNDERSTORMS ARE POSSIBLE AGAIN LATE MONDAY NIGHT AND TUESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BECOME NECESSARY TONIGHT. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WWW.CRH.NOAA.GOV/LOT (LOWER CASE) LMZ740>746-766-221100- WINTHROP HARBOR TO WILMETTE HARBOR-WILMETTE HARBOR TO NORTHERLY ISLAND-NORTHERLY ISLAND TO CALUMET HARBOR-CALUMET HARBOR TO GARY- GARY TO BURNS HARBOR-BURNS HARBOR TO MICHIGAN CITY-MICHIGAN CITY TO NEW BUFFALO-LAKE MICHIGAN- 600 AM CDT FRI MAY 21 2004 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS AND INDIANA WATERS OF LAKE MICHIGAN. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE ENTIRE AREA. A FRONTAL BOUNDARY EXTENDING FROM CENTRAL IOWA TO CENTRAL INDIANA WILL RETURN NORTHWARD AS A WARM FRONT TODAY. THIS FRONT WILL SEPARATE RELATIVELY COOL AIR TO THE NORTH FROM WARM AND STICKY AIR TO THE SOUTH. THE MAIN FOCUS FOR THUNDERSTORM DEVELOPMENT WILL BE TO THE NORTH OF THIS FRONT. HOWEVER...SCATTERED THUNDERSTORMS WILL LIKELY DEVELOP LATE THIS AFTERNOON AND TONIGHT...IN THE UNSTABLE AIR ALONG AND JUST SOUTH OF THIS BOUNDARY AS WELL. THE PRIMARY THREATS WITH STRONGER STORMS WILL BE LARGE HAIL... THUNDERSTORM WIND GUSTS ABOVE 35 KNOTS...AND FREQUENT LIGHTNING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS AGAIN SATURDAY AND SATURDAY NIGHT. IN ADDITION...A HEAVY RAINFALL POTENTIAL ALSO EXISTS FOR SATURDAY AFTERNOON AND SATURDAY NIGHT. THUNDERSTORMS MAY CONTINUE THROUGH SUNDAY...BEFORE A COLD FRONT PUSHES TROUGH THE MIDWEST AND TEMPORARILY ENDS THE STORM THREAT. THUNDERSTORMS ARE POSSIBLE AGAIN LATE MONDAY NIGHT AND TUESDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WWW.CRH.NOAA.GOV/LOT (LOWER CASE) MERZLOCK
In the hours before
Local storm report, May 21, 9:31 AM CDT, 18 minutes before
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</html>Local storm report, May 21, 9:49 AM CDT, 0 minutes before
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</html>The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 7:00 PM CDT | Severe Thunderstorm Warning | LOT | Winnebago | 60 min |
| May 20, 7:03 PM CDT | Special Marine Warning | LOT | 87 min | |
| May 20, 7:03 PM CDT | Special Marine Warning | LOT | 87 min | |
| May 20, 7:20 PM CDT | Flash Flood Warning | LOT | Boone, McHenry | 3 hr |
| May 20, 7:31 PM CDT | Flash Flood Warning | LOT | DeKalb, Kane, Lee, Ogle | 3 hr |
| May 20, 7:49 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 41 min |
| May 20, 8:03 PM CDT | Flash Flood Warning | LOT | Cook, DuPage | 3 hr |
| May 20, 8:07 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Kane | 53 min |
| May 20, 8:09 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 51 min |
| May 20, 8:19 PM CDT | Special Marine Warning | LOT | 116 min | |
| May 20, 8:19 PM CDT | Special Marine Warning | LOT | 116 min | |
| May 20, 8:57 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 48 min |
| May 20, 8:58 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Kane | 47 min |
| May 20, 9:02 PM CDT | Severe Thunderstorm Warning | LOT | McHenry | 43 min |
| May 20, 9:44 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Lake | 31 min |
| May 20, 10:00 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle, Livingston | 60 min |
| May 20, 10:08 PM CDT | Special Marine Warning | LOT | 52 min | |
| May 20, 10:08 PM CDT | Special Marine Warning | LOT | 52 min | |
| May 20, 10:20 PM CDT | Flash Flood Warning | LOT | Cook, DeKalb, DuPage, Kane, LaSalle, Lee and 1 more | 3 hr |
| May 20, 10:42 PM CDT | Severe Thunderstorm Warning | LOT | Grundy | 48 min |
| May 20, 10:59 PM CDT | Severe Thunderstorm Warning | LOT | Livingston | 31 min |
| May 20, 11:41 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee | 34 min |
| May 21, 8:25 AM CDT | Special Marine Warning | LOT | 95 min | |
| May 21, 8:25 AM CDT | Special Marine Warning | LOT | 95 min | |
| May 21, 9:00 AM CDT | Severe Thunderstorm Warning | LOT | Boone, Winnebago | 30 min |
| May 21, 9:43 AM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kane | 47 min |
| May 21, 9:52 AM CDT | Special Marine Warning | LOT | 83 min | |
| May 21, 9:52 AM CDT | Special Marine Warning | LOT | 83 min | |
| May 21, 5:46 PM CDT | Special Marine Warning | LOT | 2 hr | |
| May 21, 5:46 PM CDT | Special Marine Warning | LOT | 2 hr | |
| May 21, 12:00 AM CDT | Severe Thunderstorm Warning | LOT | Porter | 30 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2004Every severe thunderstorm warning in 2004
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.