Alert archive / Illinois / Severe Thunderstorm Warnings in 2005
Severe Thunderstorm Warning 71, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jun 29, 2005, 7:15 PM CDT for LaSalle County, Livingston County, Illinois. It was in force for 27 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
- Jun 29, 2005, 7:15 PM CDT (00:15 UTC)
- Expired
- Jun 29, 2005, 7:42 PM CDT
- In force
- 27 min
- Issued by
- NWS Chicago, IL
- Area
- Counties, with a storm outline in the text
Counties LaSalle County, IL, Livingston County, IL
The radar
The Chicago radar (KLOT), 76 km from the middle of the area, began a volume at 00:17 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 00:00Z, 0.3 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
- 1049 J/kg
- Mixed-layer CIN
- -131 J/kg
- Mixed-layer LCL
- 1913 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 224 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
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 Jun 29, 6:45 PM CDT, 30 minutes earlier.
Area forecast discussion, Jun 29, 6:45 PM CDT, 30 minutes before
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</html>Hazardous weather outlook, Jun 29, 4:30 PM CDT, 2 hours 45 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 430 PM CDT WED JUN 29 2005 ILZ003>006-008-010>014-019>022-023-032-033-039-INZ001-002-010-011- 019-301100- WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DU PAGE-COOK- LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD- LAKE IN-PORTER-NEWTON-JASPER-BENTON- 430 PM CDT WED JUN 29 2005 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA. .DAY ONE...TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE ENTIRE AREA TONIGHT. ISOLATED THUNDERSTORMS WILL CONTINUE THIS EVENING...MAINLY ALONG AND SOUTH OF A LINE FROM THE ROCKFORD AREA THROUGH KANKAKEE AND INTO NORTHWEST INDIANA SOUTH OF THE KANKAKEE RIVER. BRIEF HEVY DOWNPOURS...FREQUENT LIGHTNING AND PERHAPS SOME SMALL HAIL ARE POSSIBLE WITH THESE STORMS. THERE IS A BETTER CHANCE OF ORGANIZED THUNDERSTORMS AFTER MIDNIGHT. SOME OF THESE STORMS MAY PRODUCE DAMAGING WINDS. .DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY THERE WILL BE AN ONGOING CHANCE OF THUNDERSTORMS INTO THURSDAY MORNING ACROSS THE ENTIRE FORECAST AREA. THE THREAT OF THUNDERSTORMS WILL END FROM WEST TO EAST ACROSS THE REGION BY AFTERNOON AS A COLD FRONT USHERS DRIER AIR ACROSS THE MIDWEST. THUNDERSTORMS MAY OCCUR FROM LATE SUNDAY NIGHT INTO TUESDAY...WITH A RETURN OF WARM AND HUMID AIR. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED LATE TONIGHT. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE) LMZ740>745-766-301100- WINTHROP HARBOR IL TO MICHIGAN CITY IN- LAKE MICHIGAN- 430 PM CDT WED JUN 29 2005 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 AFTER MIDNIGHT. SOME OF THESE STORMS MAY PRODUCE BRIEF WIND GUSTS IN EXCESS OF 35 KNOTS. .DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY THERE WILL BE AN ONGOING CHANCE OF THUNDERSTORMS INTO THURSDAY MORNING ACROSS SOUTHERN LAKE MICHIGAN. THE THREAT OF THUNDERSTORMS WILL END FROM WEST TO EAST ACROSS THE LAKE BY AFTERNOON AS A COLD FRONT USHERS DRIER AIR ACROSS WESTERN GREAT LAKES REGION. THUNDERSTORMS ARE AGAIN POSSIBLE MONDAY AND TUESDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE) MERZLOCK
In the hours before
Local storm report, Jun 29, 6:29 PM CDT, 46 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 |
|---|---|---|---|---|
| Jun 30, 4:37 AM CDT | Severe Thunderstorm Warning | LOT | DeKalb, DuPage, Kane, Kendall | 35 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2005Every severe thunderstorm warning in 2005
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.