Alert archive / Illinois / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 113, NWS St. Louis, MO

November 20, 1994Montgomery County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Nov 20, 1994, 7:35 PM CST for Montgomery County, Illinois. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
Nov 20, 1994, 7:35 PM CST (01:35 UTC)
Expired
Nov 20, 1994, 8:30 PM CST
In force
55 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Montgomery County, IL

The nearest sounding before it

Paducah/Barkley, KY (KPAH), launched 00:00Z, 1.6 hours before the alert went out and 250 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 00:00Z on 1994-11-21Temperature 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 00:00Z on 1994-11-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 313 square meters per square second.1939587897Sfc1 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
1443 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
313 m²/s²
0-3 km storm-relative helicity
402 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 210137 RRA
SVRSTL
ILC135-210230-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
735 PM CST SUN NOV 20 1994
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  830 PM CST
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN CENTRAL ILLINOIS
 
   ...MONTGOMERY COUNTY
 
AT 730 PM CST...NWS DOPPLER RADAR SHOWED A LINE OF SEVERE THUNDERSTORMS
ENTERING MONTGOMERY COUNTY ILLINOIS...45 MILES NORTHEAST OF ST. LOUIS.
 
THE TOWNS OF LITCHFIELD AND HILLSBORO ARE IN THE PATH OF THESE STORMS.
 
THE SEVERE THUNDERSTORMS WERE MOVING TO THE EAST NORTHEAST AT 45 MPH.
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
 
RP

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 20, 6:51 PM CSTSevere Thunderstorm WarningLSXMacoupin54 min
Nov 20, 6:57 PM CSTSevere Thunderstorm WarningLSXMadison48 min
Nov 20, 7:45 PM CSTSevere Thunderstorm WarningLSXBond45 min
Nov 20, 7:55 PM CSTSevere Thunderstorm WarningLSXWashington35 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1994Every severe thunderstorm warning 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.