Alert archive / Illinois / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 155, NWS St. Louis, MO

August 23, 1993Madison County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 23, 1993, 6:48 PM CDT for Madison County, Illinois. It was in force for 42 min.

The area

The counties it named.

The facts

Issued: Aug 23, 1993, 6:48 PM CDT (23:48 UTC)
Expired: Aug 23, 1993, 7:30 PM CDT
In force: 42 min
Issued by: NWS St. Louis, MO
Area: Whole counties

County Madison County, IL

The radar

The St Louis radar (KLSX), 69 km from the middle of the area, began a volume at 23:49 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

Paducah/Barkley, KY (KPAH), launched 12:00Z, 11.8 hours before the alert went out and 222 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: 2053 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 960 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: -10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTL 232349
SVRSTL
ILC119-240030-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
648 PM CDT MON AUG 23 1993
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  730 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHWEST ILLINOIS
 
   ...MADISON COUNTY
 
AT 645 PM...RADAR INDICATED A SEVERE THUNDERSTORM JUST NORTHWEST OF
EDWARDSVILLE IN MADISON COUNTY...ABOUT 15 MILES NORTHEAST OF ST LOUIS.
THIS STORM WAS MOVING EAST NORTHEAST AT 30 MILES AN HOUR AND WILL AFFECT
THE CITIES OF EDWARDSVILLE...CARPENTER AND ALTON BY 730 PM.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
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
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
 
SHEA/DLF/RPn

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.

In the hours before

Special weather statement, Aug 23, 5:15 PM CDT, 1 hour 33 minutes before

MOZ011-012-232315-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
515 PM CDT MON AUG 23 1993

...STRONG THUNDERSTORMS WERE APPROACHING THE ST LOUIS AREA...

AT 500 PM...A LINE OF THUNDERSTORMS EXTENDED FROM WESTERN ILLINOIS TO 40
MILES NORTHWEST OF ST LOUIS AND DOWN INTO SOUTHERN MISSOURI.  THIS LINE
WAS MOVING EAST AT 30 MILES AN HOUR...PRODUCING VERY HEAVY RAIN...STRONG
GUSTY WIND AND FREQUENT LIGHTNING.

WIND GUSTS OF 40 TO 50 MPH WERE REPORTED ACROSS SOUTHERN PIKE COUNTY
MISSOURI AROUND 500 PM.

THESE STORMS WILL CONTINUE TO EDGE CLOSER TO ST LOUIS.  THIS LINE WILL
MOVE INTO ST CHARLES COUNTY BY 530 PM AND INTO THE ST LOUIS METRO AREA
BETWEEN 615 AND 645 PM.  IF YOU HAVE OUTDOOR PLANS...BE PREPARED TO TAKE
SHELTER OR MOVE INSIDE UNTIL STORMS PASS.

SHEA

Special weather statement, Aug 23, 5:16 PM CDT, 1 hour 32 minutes before

MOZ011-012-232315-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
515 PM CDT MON AUG 23 1993

...STRONG THUNDERSTORMS WERE APPROACHING THE ST LOUIS AREA...

AT 500 PM...A LINE OF THUNDERSTORMS EXTENDED FROM WESTERN ILLINOIS TO 40
MILES NORTHWEST OF ST LOUIS AND DOWN INTO SOUTHERN MISSOURI.  THIS LINE
WAS MOVING EAST AT 30 MILES AN HOUR...PRODUCING VERY HEAVY RAIN...STRONG
GUSTY WIND AND FREQUENT LIGHTNING.

WIND GUSTS OF 40 TO 50 MPH WERE REPORTED ACROSS SOUTHERN PIKE COUNTY
MISSOURI AROUND 500 PM.

THESE STORMS WILL CONTINUE TO EDGE CLOSER TO ST LOUIS.  THIS LINE WILL
MOVE INTO ST CHARLES COUNTY BY 530 PM AND INTO THE ST LOUIS METRO AREA
BETWEEN 615 AND 645 PM.  IF YOU HAVE OUTDOOR PLANS...BE PREPARED TO TAKE
SHELTER OR MOVE INSIDE UNTIL STORMS PASS.

SHEA

Special weather statement, Aug 23, 6:27 PM CDT, 21 minutes before

MOZ003-007-ILZ009-240030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
627 PM CDT MON AUG 23 1993

...A SEVERE THUNDERSTORM WATCH CONTINUES FOR PARTS OF NORTHEAST MISSOURI
AND WEST CENTRAL ILLINOIS UNTIL 900 PM CDT...

AT 620 PM...ISOLATED THUNDERSTORMS WITH VERY HEAVY RAIN WERE BETWEEN
KIRKSVILLE AND ST LOUIS.  THE STORMS WERE 30 MILES SOUTHEAST AND
50 MILES SOUTH OF KIRKSVILLE.  MOVEMENT WAS NORTHEAST AT 30 MILES AN
HOUR.

WITH THIS MOVEMENT...THESE STORMS WILL MOVE INTO SHELBY AND MONROE
COUNTIES OF NORTHEAST MISSOURI.  THE COMMUNITIES OF HAGERS
GROVE...EVANSVILLE AND MADISON ARE IN THE PATH OF THESE STORMS.  VERY
HEAVY RAIN AND GUSTY WIND CAN BE EXPECTED.

CONDITIONS REMAIN FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE
WATCH AREA.  REMAIN ALERT AND BE READY WHEN A WARNING IS ISSUED.  LISTEN
TO NOAA WEATHER RADIO FOR FURTHER INFORMATION.

SHEA

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Special weather statement, Aug 23, 6:28 PM CDT, 20 minutes before

MOZ003-007-ILZ009-240030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
627 PM CDT MON AUG 23 1993

...A SEVERE THUNDERSTORM WATCH CONTINUES FOR PARTS OF NORTHEAST MISSOURI
AND WEST CENTRAL ILLINOIS UNTIL 900 PM CDT...

AT 620 PM...ISOLATED THUNDERSTORMS WITH VERY HEAVY RAIN WERE BETWEEN
KIRKSVILLE AND ST LOUIS.  THE STORMS WERE 30 MILES SOUTHEAST AND
50 MILES SOUTH OF KIRKSVILLE.  MOVEMENT WAS NORTHEAST AT 30 MILES AN
HOUR.

WITH THIS MOVEMENT...THESE STORMS WILL MOVE INTO SHELBY AND MONROE
COUNTIES OF NORTHEAST MISSOURI.  THE COMMUNITIES OF HAGERS
GROVE...EVANSVILLE AND MADISON ARE IN THE PATH OF THESE STORMS.  VERY
HEAVY RAIN AND GUSTY WIND CAN BE EXPECTED.

CON@DITIONS REMAIN FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE
WATCH AREA.  REMAIN ALERT AND BE READY WHEN A WARNING IS ISSUED.  LISTEN
TO NOAA WEATHER RADIO FOR FURTHER INFORMATION.

SHEA

Special weather statement, Aug 23, 6:40 PM CDT, 8 minutes before

MOZ006-009-010-011-013-014-240030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA MO
640 PM CDT MON AUG 23 1993

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MOST OF CENTRAL MISSOURI
UNTIL 900 PM...

AT 640 PM...MOST OF THE STRONG THUNDERSTORMS HAD MOVED EAST OUT OF
CENTRAL MISSOURI. IT APPEARS THAT THE IMMEDIATE THREAT OF SEVERE WEATHER
IN CENTRAL MISSOURI IS OVER.

STANLEY

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Special weather statement, Aug 23, 6:40 PM CDT, 8 minutes before

MOZ006-009-010-011-013-014-240030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA MO
640 PM CDT MON AUG 23 1993

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MOST OF CENTRAL MISSOURI
UNTIL 900 PM...

AT 640 PM...MOST OF THE STRONG THUNDERSTORMS HAD MOVED EAST OUT OF
CENTRAL MISSOURI. IT APPEARS THAT THE IMMEDIATE THREAT OF SEVERE WEATHER
IN CENTRAL MISSOURI IS OVER.

STANLEY

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 23, 5:28 PM CDT	Severe Thunderstorm Warning	LSX	Scott	47 min
Aug 23, 6:33 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	27 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1993 Every severe thunderstorm warning in 1993

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.