Alert archive / Illinois / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 113, NWS Chicago, IL

October 26, 2010Lake County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Oct 26, 2010, 7:29 AM CDT for Lake County, Illinois. It was in force for 12 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: Oct 26, 2010, 7:29 AM CDT (12:29 UTC)
Expired: Oct 26, 2010, 7:41 AM CDT
In force: 12 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 0.5 in
Wind: 60.0 mph

County Lake County, IL

The radar

The Chicago radar (KLOT), 85 km from the middle of the area, began a volume at 12:30 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
Oct 26, 3:28 AM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 0.5 hours before the alert went out and 238 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 64 J/kg
Mixed-layer CIN: -167 J/kg
Mixed-layer LCL: 670 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 389 m²/s²
0-3 km storm-relative helicity: 414 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

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 Oct 26, 7:23 AM CDT, 6 minutes earlier.

Area forecast discussion, Oct 26, 7:23 AM CDT, 6 minutes before

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Hazardous weather outlook, Oct 26, 5:03 AM CDT, 2 hours 26 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
503 AM CDT TUE OCT 26 2010

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
271015-
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-
503 AM CDT TUE OCT 26 2010 /603 AM EDT TUE OCT 26 2010/

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

.DAY ONE...TODAY AND TONIGHT.

  WEATHER HAZARDS EXPECTED:

  THUNDERSTORMS:
    DAMAGING WINDS IN EXCESS OF 70 MPH.
    BRIEF TORRENTIAL DOWNPOURS.
    OCCASIONAL CLOUD TO GROUND LIGHTNING.
    AND POSSIBLY A TORNADO.

  AREAS AFFECTED AND TIMING:

  THE ENTIRE OUTLOOK AREA THROUGH 11 AM.

  DISCUSSION:

  A LINE OF THUNDERSTORMS HAS DEVELOPED EARLY THIS MORNING AHEAD
  OF THE COLD FRONT WHICH STRETCHED FROM EASTERN IOWA SOUTH
  THROUGH EASTERN MISSOURI. THIS LINE OF THUNDERSTORMS WAS RAPIDLY
  SLIDING EAST NORTHEAST ACROSS WESTERN ILLINOIS...AND EXPECTED TO
  PUSH THROUGH NORTHERN ILLINOIS AND NORTHWEST INDIANA BY 11 AM
  THIS MORNING. GIVEN THE INTENSITY OF THE STORM SYSTEM...EXTREMELY
  POWERFUL WINDS ALOFT AND UNSEASONABLY WARM AIRMASS...THE
  POTENTIAL EXISTS FOR THIS LINE OF STORMS TO PRODUCE DAMAGING WINDS.
  WHILE NOT HIGH...THERE IS EVEN A THREAT FOR A TORNADO OR TWO
  WITH THESE STORMS.

  IN THE WAKE OF THIS LINE OF THUNDERSTORMS...STRONG AND LOCALLY
  DAMAGING WINDS WILL GUST AT TIMES BETWEEN 45 AND 60 MPH TODAY
  THROUGH THIS EVENING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

WINDS COULD GUST UP TO 50 MPH AGAIN WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS WILL LIKELY BE NEEDED THIS MORNING.

&&

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

LMZ740>745-271015-
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-
503 AM CDT TUE OCT 26 2010

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.

GALE FORCE WINDS INCREASE TO STORM FORCE WINDS THIS MORNING.
STORM FORCE WIND GUSTS UP TO 50 KNOTS WILL BE POSSIBLE THROUGH THIS
EVENING.

THERE IS ALSO A CHANCE OF THUNDERSTORMS BEFORE NOON WITH SOME
POSSIBLY SEVERE PRODUCING WIND GUSTS OVER 50 KNOTS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

GALE FORCE WINDS ARE LIKELY TO CONTINUE TONIGHT 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-
870-872-874-876-878-271015-
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-
503 AM CDT TUE OCT 26 2010

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

.DAY ONE...TODAY AND TONIGHT.

GALE FORCE WINDS INCREASE TO STORM FORCE WINDS THIS MORNING.
STORM FORCE WIND GUSTS UP TO 50 KNOTS WILL BE POSSIBLE THROUGH THIS
EVENING.

THERE IS ALSO A CHANCE OF THUNDERSTORMS BEFORE NOON WITH SOME
POSSIBLY SEVERE PRODUCING WIND GUSTS OVER 50 KNOTS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

STORM FORCE WINDS ARE EXPECTED TO CONTINUE THROUGH WEDNESDAY...WITH
GALE FORCE WINDS PERSISTING INTO THURSDAY.

&&

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

BEACHLER

In the hours before

Special weather statement, Oct 26, 4:48 AM CDT, 2 hours 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
448 AM CDT TUE OCT 26 2010

ILZ008-010-261015-
LEE IL-OGLE IL- 448 AM CDT TUE OCT 26 2010

...SPECIAL WEATHER STATEMENT...

AT 446 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 9 MILES NORTHWEST OF
POLO TO POLO TO 16 MILES WEST OF WALTON...MOVING NORTHEAST AT 50 MPH.

ONE HALF INCH DIAMETER HAIL...WINDS UP TO 50 MPH...ARE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...HARMON AROUND 455 AM...WALTON...
SUBLETTE...AND NELSON AROUND 500 AM...POLO...AND FORRESTON AROUND 505
AM...FRANKLIN GROVE AND DIXON AROUND 510 AM.

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
THESE STORMS HAVE PASSED.

LAT...LON 4220 8969 4220 8946 4194 8897 4158 8922
      4159 8964 4193 8964 4194 8969

RODRIGUEZ/MDB

Special weather statement, Oct 26, 5:57 AM CDT, 1 hour 32 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
557 AM CDT TUE OCT 26 2010

ILZ008-010>012-019>021-032-039-261130-
DEKALB IL-FORD IL-GRUNDY IL-KANE IL-KENDALL IL-LA SALLE IL-LEE IL-
LIVINGSTON IL-OGLE IL- 556 AM CDT TUE OCT 26 2010

...SPECIAL WEATHER STATEMENT...

AT 551 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM KIRKLAND TO LELAND
TO 15 MILES SOUTH OF FLANAGAN...MOVING NORTHEAST AT 40 MPH.

WIND GUSTS TO 55 MPH ARE POSSIBLE WITH THESE STORMS. THE STRONG
WINDS WILL COMBINE WITH HEAVY RAIN TO LIMIT VISIBILITY TO LESS THAN
A HALF MILE FOR BRIEF PERIODS.

LOCATIONS IMPACTED INCLUDE...SYCAMORE...SOMONAUK...AND SHERIDAN
AROUND 605 AM...SENECA...SANDWICH...AND MILLINGTON AROUND 610 AM...
LITTLE ROCK AND STRAWN AROUND 615 AM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED.

LAT...LON 4061 8847 4062 8858 4075 8859 4075 8893
      4092 8894 4093 8906 4110 8907 4111 8917
      4158 8918 4159 8922 4212 8923 4212 8830
      4040 8827 4040 8846

RODRIGUEZ/MDB

Special weather statement, Oct 26, 6:12 AM CDT, 1 hour 17 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
612 AM CDT TUE OCT 26 2010

ILZ008-010-261145-
LEE IL-OGLE IL- 609 AM CDT TUE OCT 26 2010

...SPECIAL WEATHER STATEMENT...

AT 605 AM CDT...A COLD FRONT WAS APPROACHING WESTERN LEE AND OGLE
COUNTIES. A STRONG SURGE OF WINDS IN EXCESS OF 50 MPH IS EXPECTED TO
ACCOMPANY THE FRONT AS IT MOVES EASTWARD. SHOWERS WILL ALSO
ACCOMPANY THE FRONT. STRONG WINDS OF 30 TO 40 MPH WITH GUSTS IN
EXCESS OF 50 MPH WILL CONTINUE THIS MORNING AND THIS AFTERNOON.

LOCATIONS IMPACTED INCLUDE...NELSON...AND HARMON AROUND 620 AM...
WALTON...POLO...AND DIXON AROUND 625 AM...FORRESTON AROUND 630 AM...
SUBLETTE AND MOUNT MORRIS AROUND 635 AM.

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
THESE STORMS HAVE PASSED.

LAT...LON 4220 8969 4220 8942 4171 8910 4158 8932
      4159 8964 4193 8964 4194 8969

RODRIGUEZ/MDB

Local storm report, Oct 26, 6:28 AM CDT, 1 hour 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
628 AM CDT TUE OCT 26 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0512 AM     TSTM WND DMG     5 NNE FORRESTON         42.19N 89.54W
10/26/2010                   OGLE               IL   LAW ENFORCEMENT

            ONE LARGE TREE DOWN ABOUT 5 MILES NORTH-NORTHEAST OF
            FORRESTON NEAR THE STEPHENSON COUNTY BORDER.

&&

RC

Local storm report, Oct 26, 6:40 AM CDT, 49 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 25, 7:48 PM CDT	Gale Warning	LOT		17 hr
Oct 26, 4:48 AM CDT	Special Weather Statement	LOT	Lee, Ogle	27 min
Oct 26, 4:57 AM CDT	Severe Thunderstorm Warning	LOT	Lee, Ogle	48 min
Oct 26, 5:43 AM CDT	Severe Thunderstorm Warning	LOT	Boone, Ogle, Winnebago	32 min
Oct 26, 5:57 AM CDT	Special Weather Statement	LOT	DeKalb, Grundy, Kane, Kendall, LaSalle, Livingston	33 min
Oct 26, 6:12 AM CDT	Special Weather Statement	LOT	Lee, Ogle	33 min
Oct 26, 6:55 AM CDT	Tornado Warning	LOT	Kane	13 min
Oct 26, 7:37 AM CDT	Tornado Warning	LOT	Kankakee, Will	23 min
Oct 26, 7:46 AM CDT	Tornado Warning	LOT	Iroquois	29 min
Oct 26, 7:47 AM CDT	Severe Thunderstorm Warning	LOT	Lake	10 min
Oct 26, 8:26 AM CDT	Special Marine Warning	LOT		49 min
Oct 26, 6:41 PM CDT	Gale Warning	LOT		12 hr
Oct 26, 6:41 PM CDT	Storm Warning	LOT		27 hr
Oct 26, 8:15 AM CDT	Tornado Warning	LOT	Jasper, Lake, Porter	45 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2010 Every severe thunderstorm warning in 2010

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.