Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 153, NWS Chicago, IL

August 12, 2011DeKalb County, Ogle County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Aug 12, 2011, 7:03 PM CDT for DeKalb County, Ogle County, Illinois. It was in force for 57 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
Aug 12, 2011, 7:03 PM CDT (00:03 UTC)
Expired
Aug 12, 2011, 8:00 PM CDT
In force
57 min
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties DeKalb County, IL, Ogle County, IL

The radar

The Chicago radar (KLOT), 89 km from the middle of the area, began a volume at 00:05 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.

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 Aug 12, 7:02 PM CDT, 1 minute earlier.

Area forecast discussion, Aug 12, 7:02 PM CDT, 1 minute before
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Hazardous weather outlook, Aug 12, 3:54 PM CDT, 3 hours 9 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
354 PM CDT FRI AUG 12 2011

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
132100-
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 FRI AUG 12 2011 /454 PM EDT FRI AUG 12 2011/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

.DAY ONE...TONIGHT.

  WEATHER HAZARDS EXPECTED: THUNDERSTORMS

  * OCCASIONAL WIND GUSTS TO 40 MPH
  * OCCASIONAL LIGHTNING
  * HEAVY DOWNPOURS

  AREAS AFFECTED AND TIMING:

  * ISOLATED THUNDERSTORMS ARE EXPECTED TO MOVE INTO NORTHWESTERN
    ILLINOIS LATE THIS AFTERNOON...POSSIBLY REACHING THE ROCKFORD
    AREA BY EARLY EVENING. THUNDERSTORM ACTIVITY SHOULD BE CONFINED
    MOSTLY TO FAR NORTHERN ILLINOIS...NEAR THE WISCONSIN BORDER.

  DISCUSSION:

  * AN UPPER LEVEL DISTURBANCE WILL MOVE ACROSS SOUTHERN
    WISCONSIN TONIGHT. THERE MAY BE SUFFICIENT INSTABILITY AND
    SHEAR TO PRODUCE A FEW LOCALLY STRONG THUNDERSTORMS...BUT
    WIDESPREAD SEVERE WEATHER IS NOT ANTICIPATED.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

ISOLATED THUNDERSTORMS ARE AGAIN POSSIBLE SATURDAY AFTERNOON
ACROSS NORTHERN ILLINOIS AND NORTHWESTERN INDIANA. SOME
THUNDERSTORMS MAY BECOME SEVERE SOUTH OF A LINE FROM MICHIGAN CITY
INDIANA TO MENDOTA ILLINOIS.

THERE IS AN INCREASED RISK FOR RIP CURRENTS ALONG THE INDIANA
SHORE OF LAKE MICHIGAN SUNDAY MORNING. THERE IS THEN AN INCREASED
RISK FOR RIP CURRENTS ALONG THE ILLINOIS AND INDIANA SHORES
SUNDAY AFTERNOON THROUGH MONDAY MORNING.

THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS TUESDAY THROUGH
WEDNESDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NECESSARY THROUGH TONIGHT.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO

LMZ740>745-132100-
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 FRI AUG 12 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 WILL BE A CHANCE OF THUNDERSTORMS LATE TONIGHT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS SATURDAY
AFTERNOON AND THEN AGAIN TUESDAY THROUGH WEDNESDAY NIGHT.

STRONG WINDS AND HIGH WAVES MAY LEAD TO HAZARDOUS CONDITIONS FOR
SMALL CRAFT SUNDAY THROUGH MONDAY MORNING.

&&

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-
870-872-874-876-878-132100-
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 FRI AUG 12 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.

.DAY ONE...TONIGHT.

THERE WILL BE A CHANCE OF THUNDERSTORMS LATE TONIGHT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS SATURDAY AND
THEN AGAIN TUESDAY NIGHT THROUGH WEDNESDAY NIGHT.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO

KREIN

In the hours before

Special weather statement, Aug 12, 5:21 PM CDT, 1 hour 42 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
521 PM CDT FRI AUG 12 2011

ILZ003-008-122245-
OGLE IL-WINNEBAGO IL-
521 PM CDT FRI AUG 12 2011

...SPECIAL WEATHER STATEMENT...

AT 517 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG
THUNDERSTORM 5 MILES NORTH OF FORRESTON...MOVING EAST-SOUTHEAST AT
15 MPH.

NICKEL SIZE HAIL...WINDS UP TO 50 MPH...ARE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  FORRESTON...          MOUNT MORRIS...       BYRON...
  OREGON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE
OBJECTS TO BLOW AROUND.  SEEK SHELTER IN A STURDY STRUCTURE UNTIL
THIS STORM HAS PASSED.

LAT...LON 4220 8966 4221 8941 4230 8940 4229 8918
      4198 8932 4215 8968

BMD
Local storm report, Aug 12, 7:02 PM CDT, 1 minute before
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Local storm report, Aug 12, 7:03 PM CDT, 0 minutes before
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The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 13, 3:31 AM CDTSmall Craft AdvisoryLOT54 hr
Aug 13, 10:46 AM CDTSevere Thunderstorm WarningLOTWinnebago59 min
Aug 13, 11:29 AM CDTSevere Thunderstorm WarningLOTBoone, DeKalb, McHenry, Ogle, Winnebago46 min
Aug 13, 12:00 PM CDTSpecial Marine WarningLOT3 hr
Aug 13, 12:19 PM CDTSpecial Weather StatementLOTDeKalb, Kane, McHenry56 min
Aug 13, 12:55 PM CDTSevere Thunderstorm WarningLOTCook, Lake, McHenry50 min
Aug 13, 1:52 PM CDTSpecial Weather StatementLOTCook38 min
Aug 13, 1:54 PM CDTSpecial Weather StatementLOTOgle36 min
Aug 13, 2:02 PM CDTSpecial Marine WarningLOT88 min
Aug 13, 2:12 PM CDTSevere Thunderstorm WarningLOTCook, DuPage63 min
Aug 13, 2:23 PM CDTSevere Thunderstorm WarningLOTLee, Ogle67 min
Aug 13, 2:31 PM CDTSevere Thunderstorm WarningLOTLaSalle34 min
Aug 13, 2:48 PM CDTSevere Thunderstorm WarningLOTDeKalb, DuPage, Kane, Kendall, Will57 min
Aug 13, 2:54 PM CDTSevere Thunderstorm WarningLOTGrundy, Will41 min
Aug 13, 3:27 PM CDTSpecial Weather StatementLOTGrundy48 min
Aug 13, 3:32 PM CDTSpecial Weather StatementLOTLivingston28 min
Aug 13, 3:35 PM CDTSpecial Weather StatementLOTLivingston25 min
Aug 13, 3:44 PM CDTSpecial Weather StatementLOTKane, Kendall31 min
Aug 13, 4:01 PM CDTSpecial Weather StatementLOTLivingston44 min
Aug 13, 4:14 PM CDTSpecial Weather StatementLOTDuPage, Kane, Kendall46 min
Aug 13, 4:19 PM CDTSpecial Weather StatementLOTIroquois41 min
Aug 13, 4:24 PM CDTSevere Thunderstorm WarningLOTIroquois66 min
Aug 13, 4:44 PM CDTRip Current StatementLOTLake41 hr
Aug 13, 5:17 PM CDTAreal Flood AdvisoryLOTBoone, DeKalb, McHenry, Ogle, Winnebago2 hr
Aug 13, 3:49 PM CDTSpecial Weather StatementLOTLake56 min
Aug 13, 4:30 PM CDTSpecial Weather StatementLOTLake, Porter45 min
Aug 13, 4:47 PM CDTSevere Thunderstorm WarningLOTJasper, Lake, Porter29 min
Aug 13, 5:25 PM CDTSevere Thunderstorm WarningLOTBenton50 min

Nearby

Severe Thunderstorm Warnings in Illinois, 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; radar from the NEXRAD Level II archive.