Alert archive / Illinois / Severe Thunderstorm Warnings in 2005
Severe Thunderstorm Warning 82, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jul 20, 2005, 11:57 PM CDT for Ford County, Iroquois County, Illinois. It was in force for 48 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
- Jul 20, 2005, 11:57 PM CDT (04:57 UTC)
- Expired
- Jul 21, 2005, 12:45 AM CDT
- In force
- 48 min
- Issued by
- NWS Chicago, IL
- Area
- Counties, with a storm outline in the text
Counties Ford County, IL, Iroquois County, IL
The radar
The Chicago radar (KLOT), 104 km from the middle of the area, began a volume at 04:58 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
Lincoln, IL (KILX), launched 00:00Z, 5.0 hours before the alert went out and 76 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
- 3584 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 1174 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 152 m²/s²
- 0-3 km storm-relative helicity
- 245 m²/s²
- Significant tornado parameter
- 2.2
- Supercell composite
- 17.1
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 Jul 20, 8:00 PM CDT, 3 hours 57 minutes earlier.
Area forecast discussion, Jul 20, 8:00 PM CDT, 3 hours 57 minutes before
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</html>Hazardous weather outlook, Jul 20, 4:00 PM CDT, 7 hours 57 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 400 PM CDT WED JUL 20 2005 ILZ003>006-008-010>014-019>022-023-032-033-039-INZ001-002-010-011- 019-211100- 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- 400 PM CDT WED JUL 20 2005 THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA. .DAY ONE... TONIGHT THERE IS A CHANCE FOR SEVERE THUNDERSTORMS PRODUCING STRONG... DAMAGING WINDS OVER MUCH OF NORTHERN ILLINOIS AND NORTHWESTERN INDIANA THROUGH MIDNIGHT TONIGHT. THE MAIN THREAT OF SEVERE THUNDERSTORMS IS CONCENTRATED SOUTH OF I-90 AND ROUTE 20 IN ILLINOIS AND ALL OF NORTHWESTERN INDIANA. SPOTTER ACTIVATION MAY BE REQUIRED THROUGH MIDNIGHT TONIGHT. .DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY ON SUNDAY...HEAT INDICES WILL REACH 100 TO 105 ACROSS NORTHERN ILLINOIS NORTH OF I-80. HEAT INDICES WILL REACH 105 TO 110 SOUTH OF I-80...FROM THE KANKAKEE AND ILLINOIS RIVER VALLEYS SOUTHWARD. THESE LEVELS MAY POSE A HAZARD WITH PROLONGED EXPOSURE OR EXTENDED PHYSICAL ACTIVITY....ESPECIALLY TO THOSE WITH SENSITIVITY TO HEAT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THROUGH MIDNIGHT TONIGHT. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE) LMZ740>745-766-211100- WINTHROP HARBOR IL TO MICHIGAN CITY IN- LAKE MICHIGAN- 400 PM CDT WED JUL 20 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 FOR SEVERE THUNDERSTORMS THROUGH MIDNIGHT TONIGHT. THESE STORMS HAVE THE POTENTIAL TO PRODUCE STRONG...DAMAGING WINDS OVER THE NEARSHORE WATERS OF LAKE MICHIGAN FROM NORTHERLY ISLAND ILLINOIS TO MICHIGAN CITY INDIANA. THESE STORMS WILL HAVE THE POTENTIAL TO PRODUCE WIND GUSTS TO 50 KNOTS. .DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE)
In the hours before
Local storm report, Jul 20, 7:39 PM CDT, 4 hours 18 minutes before
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</html>Local storm report, Jul 20, 7:40 PM CDT, 4 hours 17 minutes before
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</html>Local storm report, Jul 20, 7:41 PM CDT, 4 hours 16 minutes before
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</html>Local storm report, Jul 20, 10:10 PM CDT, 1 hour 47 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 |
|---|---|---|---|---|
| Jul 20, 7:13 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Livingston | 31 min |
| Jul 20, 7:30 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois, Kankakee | 45 min |
| Jul 20, 8:13 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 47 min |
| Jul 20, 9:51 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kankakee | 30 min |
| Jul 21, 9:40 AM CDT | Special Marine Warning | LOT | 95 min | |
| Jul 21, 6:54 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Livingston | 51 min |
| Jul 21, 2:46 PM CDT | Severe Thunderstorm Warning | LOT | Porter | 44 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.