Alert archive / Illinois / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 50, NWS Chicago, IL

June 28, 2003LaSalle County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 28, 2003, 7:41 PM CDT for LaSalle County, Illinois. It was in force for 34 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 28, 2003, 7:41 PM CDT (00:41 UTC)
Expired: Jun 28, 2003, 8:15 PM CDT
In force: 34 min
Issued by: NWS Chicago, IL
Area: Counties, with a storm outline in the text

County LaSalle County, IL

The radar

The Chicago radar (KLOT), 73 km from the middle of the area, began a volume at 00:40 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

Davenport, (KDVN), launched 00:00Z, 0.7 hours before the alert went out and 138 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: 193 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 1521 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 28, 6:45 PM CDT, 56 minutes earlier.

Area forecast discussion, Jun 28, 6:45 PM CDT, 56 minutes before

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Hazardous weather outlook, Jun 28, 4:30 PM CDT, 3 hours 11 minutes before

ILZ003>006-008-010>014-019-020>023-032-033-039-INZ001-002-010-011-019
-291100-

HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE CHICAGO IL
430 PM CDT SAT JUN 28 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST
ILLINOIS...NORTHWEST INDIANA...AND THE ADJACENT WATERS OF LAKE
MICHIGAN.

.DAY ONE... TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING.

THE ATMOSPHERE OVER THE REGION WILL REMAIN UNSTABLE ENOUGH THROUGH
THIS EVENING TO SUPPORT THUNDERSTORM DEVELOPMENT.  THESE STORMS MAY
BRIEFLY PRODUCE MARGINALLY SEVERE HAIL AND WIND GUSTS TO 60 MPH IN
ISOLATED COVERAGE.

THE THUNDERSTORMS ARE EXPECTED TO WEAKEN AND DISSIPATE SOON AFTER
SUNSET.

.DAYS TWO THROUGH SEVEN... SUNDAY THROUGH FRIDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

THE NEXT THREAT OF THUNDERSTORMS APPEARS TO BE LATE IN THE UPCOMING
WEEK...ABOUT THURSDAY NIGHT OR FRIDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

&&

           NWS CHICAGO WEBPAGE

    HTTP://WWW.CRH.NOAA.GOV/LOT (LOWER CASE)
OR  HTTP://WEATHER.NOAA.GOV/CHICAGO (LOWER CASE)

MERZLOCK

In the hours before

Local storm report, Jun 28, 3:51 PM CDT, 3 hours 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
351 PM CDT SAT JUN 28 2003

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0330 PM    4 W BONFIELD              IL   1 INCH HAIL
06/28/03   KANKAKEE                       REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0330 PM    4 W BONFIELD              IL   WIND DAMAGE
06/28/03   KANKAKEE                       SIX INCH DIAMETER TREE
                                          BRANCHES DOWN. REPORTED
                                          BY LAW ENFORCEMENT
                                          OFFICIAL.

Local storm report, Jun 28, 4:30 PM CDT, 3 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
430 PM CDT SAT JUN 28 2003

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0355 PM    7 E KANKAKEE              IL   WIND DAMAGE
06/28/03   KANKAKEE                       LARGE TREE BRANCHES
                                          DOWN ACROSS ROAD NEAR
                                          ROUTES 1 AND 17.
                                          REPORTED BY PUBLIC.

Nearby

Severe Thunderstorm Warnings in Illinois, 2003 Every severe thunderstorm warning in 2003

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.