Alert archive / Illinois / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 155, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Sep 25, 2007, 1:58 PM CDT for Boone County, Illinois. It was in force for 32 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
- Sep 25, 2007, 1:58 PM CDT (18:58 UTC)
- Expired
- Sep 25, 2007, 2:30 PM CDT
- In force
- 32 min
- Issued by
- NWS Chicago, IL
- Area
- Counties, with a storm outline in the text
County Boone County, IL
The radar
The Milwaukee radar (KMKX), 75 km from the middle of the area, began a volume at 18:59 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.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 7.0 hours before the alert went out and 159 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
- 371 J/kg
- Mixed-layer CIN
- -63 J/kg
- Mixed-layer LCL
- 1038 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 Sep 25, 1:10 PM CDT, 48 minutes earlier.
Area forecast discussion, Sep 25, 1:10 PM CDT, 48 minutes before
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</html>Hazardous weather outlook, Sep 25, 5:30 AM CDT, 8 hours 28 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 530 AM CDT TUE SEP 25 2007 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 252045- 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- 530 AM CDT TUE SEP 24 2007 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA. .DAY ONE...TODAY AND TONIGHT. THUNDERSTORMS WILL BECOME LIKELY ACROSS THE AREA THIS AFTERNOON. A FEW THUNDERSTORMS COULD PRODUCE DAMAGING WINDS OR LARGE HAIL THIS AFTERNOON INTO EARLY THIS EVENING SOUTHEAST OF A LINE FROM RACINE TO BELVIDERE TO STERLING. THUNDERSTORMS WILL BE ENDING FROM NORTHWEST TO SOUTHEAST THIS EVENING AS A COLD FRONT MOVES THROUGH THE AREA. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. THERE IS A CHANCE OF THUNDERSTORMS SATURDAY NIGHT AND SUNDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUESTED THIS AFTERNOON. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ740>745-766-252045- 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 WINTHROP HARBOR IL EASTWARD TO THE MID POINT OF THE LAKE AND SOUTHWARD TO MICHIGAN CITY MI BEYOND 5 NM FROM SHORE- 530 AM CDT TUE SEP 25 2007 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 CHANCE OF THUNDERSTORMS THIS MORNING...WITH THUNDERSTORMS BECOMING LIKELY THIS AFTERNOON INTO THIS EVENING. SOME OF THE STORMS COULD PRODUCE STRONG GUSTY WINDS AND ISOLATED LARGE HAIL. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. THERE IS A CHANCE OF THUNDERSTORMS SATURDAY NIGHT AND SUNDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO HALBACH
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 25, 1:29 PM CDT | Severe Thunderstorm Warning | LOT | Ogle, Winnebago | 46 min |
| Sep 25, 2:41 PM CDT | Special Marine Warning | LOT | 94 min | |
| Sep 25, 2:42 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Lake | 48 min |
| Sep 25, 3:00 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 23 min |
| Sep 25, 3:10 PM CDT | Special Marine Warning | LOT | 64 min | |
| Sep 25, 3:22 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 21 min |
| Sep 25, 3:29 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 28 min |
| Sep 25, 4:09 PM CDT | Special Marine Warning | LOT | 87 min | |
| Sep 25, 4:18 PM CDT | Special Marine Warning | LOT | 57 min | |
| Sep 25, 4:18 PM CDT | Severe Thunderstorm Warning | LOT | Lake, Porter | 45 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2007Every severe thunderstorm 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.