Alert archive / Illinois / Tornado Warnings in 1991

Tornado Warning 2, NWS St. Louis, MO

May 10, 1991Saint Clair County, Washington County, Illinois

NWS St. Louis, MO issued this tornado warning at May 10, 1991, 4:10 PM CDT for Saint Clair County, Washington County, Illinois. It was in force for 41 min.

The area

The counties it named.

The facts

Issued
May 10, 1991, 4:10 PM CDT (21:10 UTC)
Expired
May 10, 1991, 4:51 PM CDT
In force
41 min
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Saint Clair County, IL, Washington County, IL

The nearest sounding before it

Paducah/Barkley, KY (KPAH), launched 12:00Z, 9.2 hours before the alert went out and 172 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 1991-05-10Temperature 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 1991-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 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
NaN m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
-9 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 102109
TORSTL
ILC189-163-102200-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
410 PM CDT FRI MAY 10 1991
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  500 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL ILLINOIS
 
   ...SOUTHERN WASHINGTON COUNTY
 
IN SOUTHWEST ILLINOIS
 
   ...EASTERN ST CLAIR COUNTY
 
AT 355 PM CDT...ILLINOIS HIGHWAY DEPARTMENT REPORTED TWO TORNADOES NEAR
THE INTERSECTION OF HIGHWAY 4 AND INTERSTATE 64. MOVEMENT OF THE STORMS
WAS TO THE NORTHWEST AT 20 MPH. O' FALLON, COLLINSVILLE, LEBANON
ILLLINOIS ARE IN THE DIRECT PATH OF THIS STORM...WHICH SHOULD BE IN THE
AREA BY 415 PM.
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE.
IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM
SUCH AS A CLOSET ON THE LOWEST FLOOR.  USE BLANKETS...P7ILLOWS...
OR CUSHIONS TO COVER YOUR BODY.  AVOID WINDOWS.
 
GLASS

Nearby

Tornado Warnings in Illinois, 1991Every tornado warning in 1991Tornadoes 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; the sounding from the Mesonet's radiosonde archive.