Alert archive / Illinois / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 111, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jun 30, 2011, 10:15 PM CDT for Kankakee County, Will County, Illinois; Lake County, Newton County, Indiana. It was in force for 45 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 30, 2011, 10:15 PM CDT (03:15 UTC)
- Expired
- Jun 30, 2011, 11:00 PM CDT
- In force
- 45 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Kankakee County, IL, Will County, IL, Lake County, IN, Newton County, IN
The radar
The Chicago radar (KLOT), 53 km from the middle of the area, began a volume at 03:17 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 30, 8:15 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 3.3 hours before the alert went out and 146 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
- 2216 J/kg
- Mixed-layer CIN
- -164 J/kg
- Mixed-layer LCL
- 1148 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 5.7
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 30, 9:05 PM CDT, 1 hour 10 minutes earlier.
Area forecast discussion, Jun 30, 9:05 PM CDT, 1 hour 10 minutes before
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</html>Hazardous weather outlook, Jun 30, 3:54 PM CDT, 6 hours 21 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 354 PM CDT THU JUN 30 2011 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 012100- 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- 354 PM CDT THU JUN 30 2011 /454 PM EDT THU JUN 30 2011/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TONIGHT. THERE IS A CHANCE SCATTERED THUNDERSTORMS WILL DEVELOP THIS THIS EVENING...GENERALLY ALONG AND NORTH OF A LINE FROM ROCKFORD TO CHICAGO TO RENSSELAER. THE THREAT FOR SEVERE STORMS IS LOW. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. HIGH TEMPERATURES ARE EXPECTED TO REACH INTO THE MIDDLE AND UPPER 90S ON FRIDAY. IN COMBINATION WITH DEW POINTS IN THE LOWER 70S...HEAT INDEX VALUES AROUND 105 ARE EXPECTED FRIDAY AFTERNOON...MAINLY NORTH AND WEST OF A LINE FROM PONTIAC TO CHICAGO WITH VALUES OF AROUND 100 ELSEWHERE. THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ACROSS NORTHWEST INDIANA FRIDAY MORNING. A COLD FRONT WILL BRING ADDITIONAL CHANCES FOR THUNDERSTORMS FRIDAY NIGHT OVER PORTIONS OF FAR NORTHERN ILLINOIS. THERE WILL BE PERIODIC CHANCES OF MORE THUNDERSTORMS ACROSS THE ENTIRE OUTLOOK AREA FROM SATURDAY...AND AGAIN SUNDAY NIGHT THROUGH WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ740>745-012100- 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- 354 PM CDT THU JUN 30 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. THERE IS A CHANCE OF THUNDERSTORMS TONIGHT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS FRIDAY NIGHT AND SATURDAY...AND AGAIN SUNDAY NIGHT THROUGH WEDNESDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-012100- LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH FOX ISLAND 5 NM OFFSHORE- LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI- LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO MID LAKE- 354 PM CDT THU JUN 30 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. PERIODS OF THUNDERSTORMS ARE EXPECTED THROUGH TONIGHT...MAINLY OVER CENTRAL AND NORTHERN PORTIONS OF THE LAKE. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS FRIDAY INTO SATURDAY...AND AGAIN SUNDAY NIGHT THROUGH WEDNESDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO MERZLOCK
In the hours before
Local storm report, Jun 30, 9:40 PM CDT, 35 minutes before
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</html>Local storm report, Jun 30, 9:45 PM CDT, 30 minutes before
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</html>Local storm report, Jun 30, 9:58 PM CDT, 17 minutes before
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</html>Local storm report, Jun 30, 10:04 PM CDT, 11 minutes before
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</html>Local storm report, Jun 30, 10:06 PM CDT, 9 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, 7:14 PM CDT | Special Marine Warning | LOT | 61 min | |
| Jun 30, 7:58 PM CDT | Special Marine Warning | LOT | 2 hr | |
| Jun 30, 8:21 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 24 min |
| Jun 30, 8:23 PM CDT | Special Marine Warning | LOT | 113 min | |
| Jun 30, 8:35 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Lake | 55 min |
| Jun 30, 8:41 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 64 min |
| Jun 30, 9:19 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee, Will | 41 min |
| Jun 30, 9:35 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 55 min |
| Jul 1, 7:02 AM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Livingston | 28 min |
| Jul 1, 7:43 AM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 48 min |
| Jul 1, 10:36 AM CDT | Small Craft Advisory | LOT | 11 hr | |
| Jul 1, 12:54 PM CDT | Special Marine Warning | LOT | 66 min | |
| Jul 1, 1:14 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 42 min |
| Jun 30, 11:33 PM CDT | Special Weather Statement | LOT | Newton | 27 min |
| Jul 1, 3:11 AM CDT | Special Weather Statement | LOT | Lake | 19 min |
| Jul 1, 3:31 AM CDT | Special Weather Statement | LOT | Newton | 44 min |
| Jul 1, 6:17 AM CDT | Severe Thunderstorm Warning | LOT | Jasper, Lake, Newton, Porter | 43 min |
| Jul 1, 8:06 AM CDT | Severe Thunderstorm Warning | LOT | Porter | 54 min |
| Jul 1, 9:27 AM CDT | Flash Flood Warning | LOT | Porter | 6 hr |
| Jul 1, 10:36 AM CDT | Areal Flood Advisory | LOT | Lake, Porter | 6 hr |
| Jul 1, 1:12 PM CDT | Special Weather Statement | LOT | Lake | 63 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2011Severe Thunderstorm Warnings in Indiana, 2011Every severe thunderstorm warning in 2011
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.