Alert archive / Illinois / Severe Thunderstorm Warnings in 2005
Severe Thunderstorm Warning 38, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jun 4, 2005, 12:15 PM CDT for LaSalle County, Illinois. It was in force for 60 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 4, 2005, 12:15 PM CDT (17:15 UTC)
- Expired
- Jun 4, 2005, 1:15 PM CDT
- In force
- 60 min
- Issued by
- NWS Chicago, IL
- Area
- Counties, with a storm outline in the text
County LaSalle County, IL
The radar
The Chicago radar (KLOT), 73 km from the middle of the area, began a volume at 17:14 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 4, 11:40 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 5.3 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
- 125 J/kg
- Mixed-layer CIN
- -212 J/kg
- Mixed-layer LCL
- 1014 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 168 m²/s²
- 0-3 km storm-relative helicity
- 139 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 4, 6:35 AM CDT, 5 hours 40 minutes earlier.
Area forecast discussion, Jun 4, 6:35 AM CDT, 5 hours 40 minutes before
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</html>Hazardous weather outlook, Jun 4, 11:00 AM CDT, 1 hour 15 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 1100 AM CDT SAT JUN 4 2005 ILZ003>006-008-010>014-019>022-023-032-033-039-INZ001-002-010-011- 019-051100- 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- 1100 AM CDT SAT JUN 4 2005 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA. .DAY ONE... THIS AFTERNOON AND TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE ILLINOIS PORTION OF THE OUTLOOK AREA THIS AFTERNOON AND EVENING. A LINE OF THUNDERSTORMS OVER NORTHWEST AND WEST CENTRAL ILLINOIS HAS UNDERGONE SOME WEAKENING DURING THE MORNING HOURS...BUT IS EXPECTED TO REGENERATE BY EARLY AFTERNOON AS IT MOVES INTO INCREASINGLY UNSTABLE AIR OVER NORTHERN AND CENTRAL ILLINOIS. SOME OF THESE STORMS MAY REACH SEVERE LIMITS...WITH HAIL AND BRIEF DAMAGING WIND GUSTS THE MAIN THREATS. STORMS ARE EXPECTED TO MOVE INTO THE AREA ALONG AND WEST OF INTERSTATE 39 BY 100 PM...AND REACH THE CHICAGO...JOLIET...KANKAKEE AND PAXTON AREAS BY 300 PM CDT. ACTIVITY WILL THEN SPREAD INTO NORTHWEST INDIANA LATE THIS AFTERNOON. .DAYS TWO THROUGH SEVEN... SUNDAY THROUGH FRIDAY THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE ENTIRE OUTLOOK AREA SUNDAY AND SUNDAY NIGHT. SEVERE THUNDERSTORMS WILL BE MOST LIKELY DURING THE AFTERNOON AND EVENING HOURS...AS A COLD FRONT MOVES INTO A VERY WARM...MOIST AND UNSTABLE ENVIRONMENT ACROSS ILLINOIS AND INDIANA. LARGE HAIL AND DAMAGING WINDS ARE ANTICIPATED TO BE THE MAIN SEVERE WEATHER THREATS. THUNDERSTORMS ARE EXPECTED TO COME TO AN END FROM WEST TO EAST SUNDAY NIGHT AS THE COLD FRONT MOVES ACROSS THE OUTLOOK AREA. THERE IS ANOTHER CHANCE OF THUNDERSTORMS TUESDAY NIGHT INTO THURSDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON...AND AGAIN SUNDAY AND SUNDAY EVENING. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE) LMZ740>745-766-051100- WINTHROP HARBOR IL TO MICHIGAN CITY IN- LAKE MICHIGAN- 1100 AM CDT SAT JUN 4 2005 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS AND INDIANA WATERS OF LAKE MICHIGAN. .DAY ONE... THIS AFTERNOON AND TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE ILLINOIS PORTION OF THE OUTLOOK AREA THIS AFTERNOON AND EVENING. A LINE OF THUNDERSTORMS OVER NORTHWEST AND WEST CENTRAL ILLINOIS HAS UNDERGONE SOME WEAKENING DURING THE MORNING HOURS...BUT IS EXPECTED TO REGENERATE BY EARLY AFTERNOON AS IT MOVES INTO INCREASINGLY UNSTABLE AIR OVER NORTHERN AND CENTRAL ILLINOIS. SOME OF THESE STORMS MAY CONTAIN HAIL AND BRIEF WIND GUSTS IN EXCESS OF 34 KNOTS. STORMS ARE EXPECTED TO REACH THE ILLINOIS SHORE OF LAKE MICHIGAN AROUND 300 PM CDT. ACTIVITY WILL THEN SPREAD ACROSS THE REMAINDER OF SOUTHERN LAKE MICHIGAN LATE THIS AFTERNOON. .DAYS TWO THROUGH SEVEN... SUNDAY THROUGH FRIDAY THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS SUNDAY AND SUNDAY NIGHT. SEVERE THUNDERSTORMS WILL BE MOST LIKELY DURING THE LATE AFTERNOON AND EARLY EVENING HOURS...WITH DAMAGING WINDS AND LARGE HAIL ANTICIPATED TO BE THE MAIN SEVERE WEATHER THREATS. THUNDERSTORMS ARE EXPECTED TO COME TO AN END FROM WEST TO EAST SUNDAY NIGHT AS A COLD FRONT MOVES THROUGH THE AREA. THERE IS ANOTHER CHANCE OF THUNDERSTORMS TUESDAY NIGHT INTO THURSDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE) MERZLOCK
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 4, 1:01 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, DuPage, Kane, Kendall | 46 min |
| Jun 4, 1:28 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Will | 47 min |
| Jun 4, 1:37 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Lake, McHenry | 53 min |
| Jun 4, 2:09 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 41 min |
| Jun 4, 4:19 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 41 min |
| Jun 4, 4:58 PM CDT | Severe Thunderstorm Warning | LOT | Will | 62 min |
| Jun 4, 5:35 PM CDT | Flash Flood Warning | LOT | Cook, Will | 3 hr |
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.