Alert archive / Illinois / Severe Thunderstorm Warnings in 2014
Severe Thunderstorm Warning 61, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jun 18, 2014, 7:27 PM CDT for 5 counties in Illinois. It was in force for 63 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 18, 2014, 7:27 PM CDT (00:27 UTC)
- Expired
- Jun 18, 2014, 8:30 PM CDT
- In force
- 63 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Cook County, IL, DuPage County, IL, Grundy County, IL, Kendall County, IL, Will County, IL
The radar
The Chicago radar (KLOT), 2 km from the middle of the area, began a volume at 00:27 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, 0.5 hours before the alert went out and 168 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
- 3005 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 1323 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 124 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 3.9
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 18, 6:57 PM CDT, 30 minutes earlier.
Area forecast discussion, Jun 18, 6:57 PM CDT, 30 minutes before
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</html>Hazardous weather outlook, Jun 18, 3:32 PM CDT, 3 hours 55 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 332 PM CDT WED JUN 18 2014 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 192045- 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- 332 PM CDT WED JUN 18 2014 /432 PM EDT WED JUN 18 2014/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TONIGHT. WEATHER HAZARDS EXPECTED: THUNDERSTORMS WHICH MAY PRODUCE: WIND GUSTS TO 45 MPH. TORRENTIAL DOWNPOURS. SMALL HAIL. AREAS AFFECTED AND TIMING: SHOWERS AND PERHAPS ANOTHER THUNDERSTORM MAY FORM ESPECIALLY ALONG THE WISCONSIN ILLINOIS STATE LINE THIS EVENING INTO TONIGHT. DISCUSSION: CONFIDENCE IS LOW IN THUNDERSTORM DEVELOPMENT THROUGH TONIGHT. THE ATMOSPHERE REMAINS VERY STABLE AFTER THE LINE OF STORMS THAT MARCHED THROUGH TODAY. SEEING A FEW SHOWERS FORM OVER SOUTHERN WISCONSIN AND ALONG A BOUNDARY OVER CENTRAL ILLINOIS. STORMS MAY MOVE INTO THE WARNING AREA TONIGHT BUT ONCE AGAIN HAVE VERY LOW CONFIDENCE GIVEN THE STABLE ENVIRONMENT. ANY STORMS THAT DUE FORM WILL BE CAPABLE OF TORRENTIAL DOWNPOURS AND GUSTY WINDS. THE STRONGER STORMS MAY PRODUCE GUSTS TO 45 MPH AND SMALL HAIL. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. THUNDERSTORMS WILL CONTINUE TO BE POSSIBLE AT TIMES. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT. && LMZ740>745-192045- 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- 332 PM CDT WED JUN 18 2014 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 PERIODICALLY AFFECTING THE NEARSHORE WATERS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS. && LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-192045- 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- 332 PM CDT WED JUN 18 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. THERE IS A CHANCE OF THUNDERSTORMS PERIODICALLY AFFECTING THE SOUTHERN END OF THE LAKE. AREAS OF DENSE FOG ARE ALSO POSSIBLE...ESPECIALLY ACROSS SOUTHERN LAKE MICHIGAN. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS. && JEE VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE) FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT: WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV WWW.TWITTER.COM/NWSCHICAGO WWW.YOUTUBE.COM/NWSCHICAGO
In the hours before
Special weather statement, Jun 18, 5:43 PM CDT, 1 hour 44 minutes before
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</html>Local storm report, Jun 18, 6:46 PM CDT, 41 minutes before
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</html>Local storm report, Jun 18, 7:13 PM CDT, 14 minutes before
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</html>Local storm report, Jun 18, 7:21 PM CDT, 6 minutes before
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</html>Local storm report, Jun 18, 7:26 PM CDT, 1 minute 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 18, 10:24 PM CDT | Special Weather Statement | LOT | Lee | 21 min |
| Jun 18, 10:47 PM CDT | Flash Flood Warning | LOT | LaSalle, Lee | 6 hr |
| Jun 19, 12:20 AM CDT | Severe Thunderstorm Warning | LOT | Lee | 55 min |
| Jun 19, 12:52 AM CDT | Flash Flood Warning | LOT | Lee, Ogle | 8 hr |
| Jun 19, 1:42 AM CDT | River Flood Advisory | LOT | Will | 36 hr |
| Jun 19, 1:42 AM CDT | River Flood Advisory | LOT | Kane, Kendall | 29 hr |
| Jun 19, 4:24 AM CDT | Areal Flood Warning | LOT | LaSalle, Lee | 6 hr |
| Jun 19, 8:05 AM CDT | Marine Dense Fog Advisory | LOT | 7 hr | |
| Jun 19, 8:48 AM CDT | Areal Flood Warning | LOT | Lee | 8 hr |
| Jun 19, 10:21 AM CDT | Flash Flood Watch | LOT | Lee, Ogle, Winnebago | 17 hr |
| Jun 19, 2:15 PM CDT | Special Weather Statement | LOT | Kankakee | 45 min |
| Jun 19, 3:08 PM CDT | Special Weather Statement | LOT | Kankakee | 37 min |
| Jun 19, 4:53 PM CDT | Areal Flood Advisory | LOT | Iroquois, Kankakee, Will | 6 hr |
| Jun 18, 8:52 PM CDT | Severe Thunderstorm Warning | LOT | Benton, Jasper, Lake, Newton | 53 min |
| Jun 19, 2:34 PM CDT | Special Weather Statement | LOT | Jasper | 41 min |
| Jun 19, 4:38 PM CDT | Special Weather Statement | LOT | Newton | 37 min |
| Jun 19, 5:15 PM CDT | Special Weather Statement | LOT | Porter | 45 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2014Every severe thunderstorm warning in 2014
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.