Alert archive / Illinois / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 73, NWS St. Louis, MO

August 3, 1991Monroe County, Saint Clair County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 3, 1991, 3:38 PM CDT for Monroe County, Saint Clair County, Illinois. It was in force for 52 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 3, 1991, 3:38 PM CDT (20:38 UTC)
Expired
Aug 3, 1991, 4:30 PM CDT
In force
52 min
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Monroe County, IL, Saint Clair County, IL

What was reported inside it

TimeReportWhereRemark
Aug 3, 3:40 PM CDTThunderstorm Wind 0Monroe, IL

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Paducah/Barkley, KY (KPAH), launched 12:00Z, 8.6 hours before the alert went out and 188 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, Paducah/Barkley, KY at 12:00Z on 1991-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Paducah/Barkley, KY at 12:00Z on 1991-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -52 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
0 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
-52 m²/s²
0-3 km storm-relative helicity
58 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 032045
SVRSTL
ILC133-163-032130-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
338 PM CDT SAT AUG 3 1991
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  430 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTHWEST ILLINOIS
 
   ...SOUTHERN MONROE COUNTY...SOUTHERN ST. CLAIR
 
AT 340 PM..CDT WEATHER SERVICE RADAR SHOWED SEVERAL SEVERE THUNDERSTORMS
OVER SOUTHERN MONROE COUNTY..BETWEEN 5 MILES SOUTHWEST OF WATERLOO
TO 10 MILES SOUTH OF BELLEVILLE, ILLINOIS..ABOUT 30 MILES SOUTHEAST
OF ST. LOUIS.
 
AT 335 PM CDT..THE MONROE COUNTY SHERIFF REPORTED SEVERAL LARGE TREES
DOWN IN THE TOWN OF WATERLOO.
 
THE TOWNS OF NEW ATHENS AND HECKER ARE IN THE PATH OF THESE STORMS.
 
THE SEVERE THUNDERSTORMS WERE MOVING TO THE EAST AT 20 MILES AN HOUR.
 
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO hNOT STAND BY WINDOWS.  DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.
PRZYBYLINSKI

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 3, 1:38 PM CDT, 2 hours before
MOZ011-012-032300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
135 PM CDT SAT AUG 3 1991

...HEAT ADVISORY IS IN EFFECT FOR EAST-CENTRAL MISSOURI THIS
   AFTERNOON...

THE NATIONAL WEATHER SERVICE HAS ISSUED A HEAT ADVISORY FOR EAST
CENTRAL MISSOURI INCLUDING THE ST LOUIS METROPOLITAN AREA FOR THIS
AFTERNOON.  DAYTIME HIGHS ARE EXPECTED TO BE AROUND 100 DEGREES.  THE
COMBINATION OF THIS INTENSE HEAT AND HIGH HUMIDITY WILL RESUL,T IN HEAT
INDICES IN THE 105 TO 110 DEGREE RANGE.

PLEASE EXERCISE CAUTION IF YOU ENGAGE IN OUTDOOR ACTIVITIES.  DRINK
PLENTY OF FLUIDS AND TAKE FREQUENT BREAKS IN THE SHADE OR AIR
CONDITIONED PLACES IF POSSIBLE.

SMALL
Special weather statement, Aug 3, 3:31 PM CDT, 7 minutes before
MOZ011-012-017-018-032130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
325 PM CDT SAT AUG 3 1991

AT 320 PM CDT...STRONG THUNDERSTORMS WERE SCATTERED OVER PARTS
OF SOUTHWEST ILLINOIS AND EAST CENTRAL MISSOURI.

THE AREA OF THUNDERSTORMS EXTENDED FROM 20 MILES NORTH OF ROLLA
MISSOURI TO 15 MILES SOUTHEAST OF BELLEVILLE ILLINOIS.

THE STRONGEST THUNDERSTORMS WERE LOCATED 10 MILES NORTH OF
ROLLA...AND BETWEEN 15 MILES SOUTHWEST OF ST. LOUIS TO 40 MILES
SOUTHEAST OF ST. LOUIS.

AT 310 PM CDT...A SEVERE WEATHER SPOTTER IN WATERLOO ILLINOIS...ABOUT
15 MILES SOUTHEAST OF ST. LOUIS REPORTED WINDS GUSTING TO NEAR 50 MILES
AN HOUR IN A THUNDERSTORM.

BRIEF GUSTY SURFACE WINDS...HAIL...HEAVY DOWNPOURS AND DANGEROUS
LIGHTNING WILL ACCOMPANY MANY OF THESE STORMS.

THE THUNDERSTORMS WERE MOVING TO THE EAST AT 20 MILES AN HOUR.
PRZYBYLINSKI

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 4:09 PM CDTSevere Thunderstorm WarningLSXRandolph51 min
Aug 3, 5:06 PM CDTSevere Thunderstorm WarningLSXRandolph54 min
Aug 3, 5:10 PM CDTSevere Thunderstorm WarningLSXJefferson, Perry50 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1991Every severe thunderstorm warning in 1991

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.