Alert archive / Illinois / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 45, NWS Chicago, IL

June 1, 2007DuPage County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 1, 2007, 6:59 PM CDT for DuPage County, Illinois. It was in force for 46 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 1, 2007, 6:59 PM CDT (23:59 UTC)
Expired
Jun 1, 2007, 7:45 PM CDT
In force
46 min
Issued by
NWS Chicago, IL
Area
Counties, with a storm outline in the text

County DuPage County, IL

The radar

The Chicago radar (KLOT), 28 km from the middle of the area, began a volume at 00:02 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 12:00Z, 12.0 hours before the alert went out and 194 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 2007-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 532 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 2007-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 square meters per square second.1939Sfc1 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
532 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
717 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
59 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 Jun 1, 6:50 PM CDT, 9 minutes earlier.

Area forecast discussion, Jun 1, 6:50 PM CDT, 9 minutes before
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Hazardous weather outlook, Jun 1, 3:20 PM CDT, 3 hours 39 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
320 PM CDT FRI JUN 1 2007

ILZ003>006-008-010>014-019>022-023-032-033-039-INZ001-002-010-011-
019-012130-
WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DU PAGE-COOK-
LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-
LAKE IN-PORTER-NEWTON-JASPER-BENTON-
320 PM CDT FRI JUN 1 2007

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

  A TORNADO WATCH IS EFFECT UNTIL 700PM FOR PORTIONS OF NORTH
  CENTRAL AND NORTHEAST ILLINOIS...GENERALLY WEST OF THE FOX AND
  ILLINOIS RIVERS.

  STRONG TO SEVERE THUNDERSTORMS WILL SPREAD EASTWARD INTO NORTH
  CENTRAL ILLINOIS THIS AFTERNOON...AND POSSIBLY CONTINUE EASTWARD
  INTO NORTHEAST ILLINOIS BY THIS EVENING. IN ADDITION HAIL UP TO
  THE SIZE OF GOLF BALLS AND DAMAGING WINDS IN EXCESS OF 60
  MPH...THE POTENTIAL EXISTS FOR AN ISOLATED TORNADO OR TWO.

  THUNDERSTORM COVERAGE IS FORECAST TO INCREASE TONIGHT...WITH THE
  POTENTIAL FOR LOCALLY HEAVY RAINFALL.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

  THERE WILL BE A CONTINUED CHANCE OF THUNDERSTORMS THROUGH
  MONDAY...MAINLY DURING THE AFTERNOON AND EVENING HOURS.
  THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER WILL REMAIN LOW.

.SPOTTER INFORMATION STATEMENT...

  SPOTTER ACTIVATION IS REQUESTED THIS AFTERNOON OVER NORTH CENTRAL
  ILLINOIS AND MAY BE NEEDED ACROSS NORTHEAST ILLINOIS BY EARLY
  EVENING.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE
NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE)

LMZ740>745-766-012130-
WINTHROP HARBOR IL TO MICHIGAN CITY IN-
LAKE MICHIGAN-
320 PM CDT FRI JUN 1 2007

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

.DAY ONE... THIS AFTERNOON AND TONIGHT

  THERE IS A CHANCE OF THUNDERSTORMS ACROSS SOUTHERN LAKE MICHIGAN
  BY LATE THIS AFTERNOON.  THUNDERSTORM COVERAGE IS EXPECTED TO
  INCREASE TONIGHT.

.DAYS TWO THROUGH SEVEN... SATURDAY THROUGH THURSDAY

  THERE WILL BE A CONTINUED CHANCE OF THUNDERSTORMS THROUGH
  MONDAY...MAINLY DURING THE AFTERNOON AND EVENING HOURS.
  THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER WILL REMAIN LOW.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE
NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO (LOWER CASE)

KML/IZZI

In the hours before

Local storm report, Jun 1, 4:23 PM CDT, 2 hours 36 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
423 PM CDT FRI JUN 01 2007

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

0337 PM     TSTM WND DMG     6 SW FORRESTON          42.06N 89.66W
06/01/2007                   OGLE               IL   LAW ENFORCEMENT

            WIRES DOWN IN BROOKVILLE

&&

HALBACH

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 1, 3:59 AM CDTDense Fog AdvisoryLOTBoone, DeKalb, Kane, Lake, Lee, McHenry and 2 more6 hr
Jun 1, 3:26 PM CDTSevere Thunderstorm WarningLOTOgle79 min
Jun 1, 3:37 PM CDTSevere Thunderstorm WarningLOTLee68 min
Jun 1, 4:02 PM CDTSevere Thunderstorm WarningLOTWinnebago73 min
Jun 1, 4:38 PM CDTSevere Thunderstorm WarningLOTOgle67 min
Jun 1, 4:49 PM CDTSevere Thunderstorm WarningLOTLee43 min
Jun 1, 5:12 PM CDTSevere Thunderstorm WarningLOTWinnebago34 min
Jun 1, 6:01 PM CDTSevere Thunderstorm WarningLOTLaSalle44 min
Jun 1, 6:19 PM CDTSevere Thunderstorm WarningLOTDeKalb29 min
Jun 1, 6:35 PM CDTSevere Thunderstorm WarningLOTKendall46 min
Jun 1, 6:48 PM CDTSevere Thunderstorm WarningLOTKane31 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2007Every severe thunderstorm warning in 2007

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.