Alert archive / Indiana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 124, NWS Chicago, IL

July 11, 2011Cook County, Will County, Illinois; Jasper County, Lake County, Porter County, Indiana

NWS Chicago, IL issued this severe thunderstorm warning at Jul 11, 2011, 8:22 AM CDT for Cook County, Will County, Illinois; Jasper County, Lake County, Porter County, Indiana. It was in force for 53 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 11, 2011, 8:22 AM CDT (13:22 UTC)
Expired
Jul 11, 2011, 9:15 AM CDT
In force
53 min
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Hail
0.5 in
Wind
70.0 mph

Counties Cook County, IL, Will County, IL, Jasper County, IN, Lake County, IN, Porter County, IN

The radar

The Chicago radar (KLOT), 56 km from the middle of the area, began a volume at 13:23 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.

IssuedProductOfficeLasted
Jul 11, 5:37 AM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 1.4 hours before the alert went out and 176 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.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2011-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4025 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2011-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 203 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
4025 J/kg
Mixed-layer CIN
-152 J/kg
Mixed-layer LCL
1373 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
203 m²/s²
0-3 km storm-relative helicity
187 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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 11, 6:49 AM CDT, 1 hour 33 minutes earlier.

Area forecast discussion, Jul 11, 6:49 AM CDT, 1 hour 33 minutes before
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Hazardous weather outlook, Jul 11, 4:53 AM CDT, 3 hours 29 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
453 AM CDT MON JUL 11 2011

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
121000-
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-
453 AM CDT MON JUL 11 2011 /553 AM EDT MON JUL 11 2011/

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

.DAY ONE...TODAY AND TONIGHT.

  WEATHER HAZARDS EXPECTED:

  THUNDERSTORMS...SOME OF WHICH COULD PRODUCE:
  HAIL TO ONE INCH.
  STRONG DAMAGING WIND GUSTS IN EXCESS OF 60 MPH.
  LOCALLY HEAVY RAINFALL.

  AREAS AFFECTED AND TIMING:

  ALL OF NORTHERN ILLINOIS AND NORTHWEST INDIANA EARLY THIS
  MORNING THROUGH THIS AFTERNOON.

  DISCUSSION:

  A CLUSTER OF THUNDERSTORMS WILL CONTINUE TO SHIFT EAST INTO
  NORTHERN ILLINOIS AND NORTHWEST INDIANA EARLY THIS MORNING AS A
  MID LEVEL DISTURBANCE TRACKS EAST ACROSS THE REGION. AS THESE
  THUNDERSTORMS MOVE EAST...THEY WILL ENCOUNTER A STRONGLY
  UNSTABLE AND MOISTURE RICH ATMOSPHERE WHICH WILL ENABLE THESE
  STORMS TO MAKE A STRONG PUSH EAST THIS MORNING. ALTHOUGH LARGE
  HAIL WILL BE POSSIBLE...THE MAIN THREAT WITH THESE STORMS WILL
  BE STRONG DAMAGING WIND GUSTS AS WELL AS LOCALLY HEAVY RAINFALL.

TEMPERATURES ARE FORECAST TO REACH THE LOWER 90S WITH HIGH
HUMIDITY CONTRIBUTING TO HEAT INDEX VALUES OF 105 TO 110 DEGREES
SOUTH OF A LINE FROM LIVINGSTON COUNTY IN ILLINOIS EAST TO JASPER
COUNTY IN INDIANA...WITH ALL OTHER AREAS IN NORTHERN ILLINOIS AND
NORTHWEST INDIANA FORECAST TO OBSERVE HEAT INDEX VALUES OF AROUND
100 DEGREES.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS TUESDAY THROUGH
SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS WILL LIKELY BE NEEDED EARLY THIS MORNING THROUGH THIS
AFTERNOON.

&&

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

LMZ740>745-121000-
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-
453 AM CDT MON JUL 11 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE
WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE
MICHIGAN.

.DAY ONE...TODAY AND TONIGHT.

THERE IS A CHANCE OF THUNDERSTORMS EARLY THIS MORNING THROUGH THIS
AFTERNOON WITH WINDS OF 34 KNOTS OR GREATER POSSIBLE WITH THE
STRONGEST THUNDERSTORMS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

THERE IS A CHANCE OF THUNDERSTORMS TUESDAY THROUGH TUESDAY NIGHT
AND ONCE AGAIN ON FRIDAY THROUGH FRIDAY NIGHT.

&&

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-
870-872-874-876-878-121000-
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-
453 AM CDT MON JUL 11 2011

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

.DAY ONE...TODAY AND TONIGHT.

THERE IS A CHANCE OF THUNDERSTORMS EARLY THIS MORNING THROUGH THIS
AFTERNOON WITH WINDS OF 34 KNOTS OR GREATER POSSIBLE WITH THE
STRONGEST THUNDERSTORMS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

THERE IS A CHANCE OF THUNDERSTORMS TUESDAY THROUGH TUESDAY NIGHT
MAINLY FOR THE SOUTHERN HALF OF LAKE MICHIGAN...AND ONCE AGAIN
THURSDAY NIGHT THROUGH FRIDAY NIGHT FOR THE ENTIRE LAKE.

&&

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

RODRIGUEZ

In the hours before

Local storm report, Jul 11, 8:04 AM CDT, 18 minutes before
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Local storm report, Jul 11, 8:05 AM CDT, 17 minutes before
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Local storm report, Jul 11, 8:09 AM CDT, 13 minutes before
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Local storm report, Jul 11, 8:16 AM CDT, 6 minutes before
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Local storm report, Jul 11, 8:18 AM CDT, 4 minutes before
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Local storm report, Jul 11, 8:20 AM CDT, 2 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 4:17 AM CDTHeat AdvisoryLOTFord, Iroquois, Kankakee, Livingston15 hr
Jul 11, 6:16 AM CDTSevere Thunderstorm WarningLOTBoone, DeKalb, LaSalle, Lee, Ogle, Winnebago59 min
Jul 11, 6:48 AM CDTSpecial Marine WarningLOT3 hr
Jul 11, 7:03 AM CDTSevere Thunderstorm WarningLOTBoone, Cook, DeKalb, DuPage, Kane, Kendall and 6 more57 min
Jul 11, 7:17 AM CDTSevere Thunderstorm WarningLOTLee, Ogle, Winnebago43 min
Jul 11, 7:44 AM CDTSevere Thunderstorm WarningLOTCook, DuPage, Kendall, Lake, Will46 min
Jul 11, 8:01 AM CDTSpecial Weather StatementLOTKane, McHenry29 min
Jul 11, 8:33 AM CDTSpecial Weather StatementLOTDuPage, Kendall, Lake42 min
Jul 11, 9:31 AM CDTLakeshore Flood WarningLOTLake3 hr

Nearby

Severe Thunderstorm Warnings in Indiana, 2011Severe 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.