Alert archive / Illinois / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 243, NWS St. Louis, MO

August 4, 2003Madison County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 4, 2003, 2:09 AM CDT for Madison County, Illinois. It was in force for 21 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 4, 2003, 2:09 AM CDT (07:09 UTC)
Expired
Aug 4, 2003, 2:30 AM CDT
In force
21 min
Issued by
NWS St. Louis, MO
Area
Counties, with a storm outline in the text

County Madison County, IL

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 7.2 hours before the alert went out and 180 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 00:00Z on 2003-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 657 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 00:00Z on 2003-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 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
657 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1415 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
60 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

967 
WUUS53 KLSX 040709
SVRLSX
ILC119-040730-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
207 AM CDT MON AUG 4 2003

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ALL OF MADISON COUNTY IN SOUTHWEST ILLINOIS
  THIS WARNING REPLACES THE PREVIOUS WARNING FOR EASTERN MADISON     
  COUNTY

* UNTIL 230 AM CDT

* AT 207 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  TWO SEVERE THUNDERSTORMS...ONE IN CENTRAL MADISON COUNTY AND ONE   
  IN EASTERN MADISON COUNTY.  THE NEW SEVERE THUNDERSTORM WAS NEAR  
  EDWARDSVILLE AND THE ORIGINAL SEVERE THUNDERSTORM WAS JUST NORTH   
  OF MARINE...BOTH ARE MOVING SOUTHEAST AT 15 MPH.   THE PRIMARY     
  THREAT FROM THESE STORMS WILL BE DAMAGING HAIL.

* LOCATIONS IMPACTED INCLUDE...
  GLEN CARBON
  PONTOON BEACH
  MARYVILLE
  TROY
  COLLINSVILLE
  ST. JACOB
  MARINE

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME
OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO
AREAS WHERE WATER COVERS THE ROAD.

LAT...LON 3900 8966 3886 9014 3866 9003 3866 8959

$$

CARNEY

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 3, 8:09 PM CDTSevere Thunderstorm WarningLSXMarion51 min
Aug 4, 1:52 AM CDTSevere Thunderstorm WarningLSXMadison23 min
Aug 4, 2:32 AM CDTSevere Thunderstorm WarningLSXClinton, Madison, Saint Clair43 min
Aug 4, 3:39 AM CDTSevere Thunderstorm WarningLSXWashington36 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2003Every 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.