Alert archive / Illinois / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 99, NWS St. Louis, MO

May 9, 2003Randolph County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 9, 2003, 5:08 PM CDT for Randolph County, Illinois. It was in force for 22 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
May 9, 2003, 5:08 PM CDT (22:08 UTC)
Expired
May 9, 2003, 5:30 PM CDT
In force
22 min
Issued by
NWS St. Louis, MO
Area
Counties, with a storm outline in the text

County Randolph County, IL

The radar

The St Louis radar (KLSX), 116 km from the middle of the area, began a volume at 22:09 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, 10.1 hours before the alert went out and 258 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 2003-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2615 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2003-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 348 square meters per square second.1939587897117Sfc1 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
2615 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
727 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
348 m²/s²
0-3 km storm-relative helicity
389 m²/s²
Significant tornado parameter
5.6
Supercell composite
21.6

Open this sounding in Storm Lab

The text

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

019 
WUUS53 KLSX 092208
SVRLSX
ILC157-092230-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
507 PM CDT FRI MAY 9 2003

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN RANDOLPH COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 530 PM CDT

* AT 507 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER BREMEN...MOVING EAST AT 35 MPH. STORM
  SPOTTERS REPORTED PENNY SIZE HAIL 1 MILE NORTH OF CHESTER AT
  506 PM.

* LOCATIONS IMPACTED INCLUDE...
  PERCY
  STEELVILLE
  SHILOH HILL

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 3804 8977 3789 8975 3790 8964 3810 8960

$$
JPK/MB

The office that day

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

IssuedProductOfficeCountiesLasted
May 8, 8:21 PM CDTSevere Thunderstorm WarningLSXAdams39 min
May 8, 8:49 PM CDTSevere Thunderstorm WarningLSXAdams, Brown, Pike26 min
May 8, 10:21 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene, Jersey39 min
May 9, 5:43 PM CDTSevere Thunderstorm WarningLSXRandolph32 min
May 9, 5:56 PM CDTSevere Thunderstorm WarningLSXGreene49 min
May 9, 6:01 PM CDTSevere Thunderstorm WarningLSXWashington44 min
May 9, 6:42 PM CDTSevere Thunderstorm WarningLSXMarion18 min
May 9, 6:42 PM CDTTornado WarningLSXCalhoun, Pike48 min
May 9, 6:45 PM CDTSevere Thunderstorm WarningLSXGreene30 min
May 9, 6:52 PM CDTSevere Thunderstorm WarningLSXMacoupin38 min
May 9, 6:56 PM CDTTornado WarningLSXGreene, Macoupin49 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; radar from the NEXRAD Level II archive.