Alert archive / Illinois / Tornado Warnings in 1994

Tornado Warning 18, NWS St. Louis, MO

April 28, 1994Saint Clair County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 28, 1994, 12:40 PM CDT for Saint Clair County, Illinois. It was in force for 24 min.

The area

The counties it named.

The facts

Issued
Apr 28, 1994, 12:40 PM CDT (17:40 UTC)
Expired
Apr 28, 1994, 1:04 PM CDT
In force
24 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Saint Clair County, IL

The radar

The St Louis radar (KLSX), 70 km from the middle of the area, began a volume at 17:40 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, 5.7 hours before the alert went out and 189 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 1994-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 17 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, Paducah/Barkley, KY at 12:00Z on 1994-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 215 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
17 J/kg
Mixed-layer CIN
-408 J/kg
Mixed-layer LCL
1344 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
215 m²/s²
0-3 km storm-relative helicity
314 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 281741
TORSTL
ILC189-163-281830-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1240 PM CDT THU APR 28 1994
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  130 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL ILLINOIS
 
   ...SOUTHERN WASHINGTON COUNTY
 
IN SOUTHWEST ILLINOIS
 
   ...SOUTHEASTERN ST CLAIR COUNTY
 
AT 1238 PM...A TORNADO WAS ON THE GROUND JUST SOUTHWEST OF
BALDWIN...ABOUT 5 MILES NORTHWEST OF SPARTA. THE TORANDO WAS MOVING TO
THE NORTHEAST AT 40 MPH.
 
IF YOU LIVE IN MARRISA AND LIVELY GROVE TAKE COVER NOW!
 
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...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY.  AVOID WINDOWS.
 
FG
 
 
 
&

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 27, 7:05 PM CDTSevere Thunderstorm WarningLSXMonroe40 min
Apr 28, 3:03 AM CDTFlash Flood WarningLSXMadison5 hr
Apr 28, 5:55 AM CDTFlash Flood WarningLSXMadison4 hr
Apr 28, 6:35 AM CDTFlash Flood WarningLSXMonroe, Saint Clair4 hr
Apr 28, 10:45 AM CDTFlash Flood WarningLSXMonroe, Saint Clair3 hr
Apr 28, 12:22 PM CDTTornado WarningLSXRandolph38 min
Apr 28, 12:40 PM CDTTornado WarningLSXWashington50 min
Apr 28, 1:00 PM CDTTornado WarningLSXRandolph23 min
Apr 28, 1:00 PM CDTTornado WarningLSXPerry45 min

Nearby

Tornado Warnings in Illinois, 1994Every tornado warning in 1994Tornadoes in 1994

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.