Alert archive / Illinois / Tornado Warnings in 1994

Tornado Warning 4, NWS St. Louis, MO

April 15, 1994Saint Clair County, Illinois

NWS St. Louis, MO issued this tornado warning at Apr 15, 1994, 5:15 AM CDT for Saint Clair County, Illinois. It was in force for 45 min.

The area

The counties it named.

The facts

Issued: Apr 15, 1994, 5:15 AM CDT (10:15 UTC)
Expired: Apr 15, 1994, 6:00 AM CDT
In force: 45 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 10:17 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 00:00Z, 10.3 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-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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2422 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 115 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 151017
TORSTL
ILC163-151100-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
515 AM CDT FRI APR 15 1994
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  600 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHWEST ILLINOIS
 
   ...ST CLAIR COUNTY
 
AT 513 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUES TO INDICATE
A POSSIBLE TORNADO WITHIN A LINE OF SEVERE THUNDERSTORMS JUST SOUTH OF
ST LOUIS. THIS LINE OF STORMS WAS MOVING EAST AT 35 TO 40 MILES AN HOUR
AND WILL MOVE INTO THE COMMUNITIES OF DUPO...MILLSTADT AND BELLEVILLE
AROUND 530 TO 545 AM.
 
WHILE NO TORNADO REPORTS HAVE BEEN VERIFIED...NUMEROUS REPORTS OF DAMAGE
FROM THESE STORMS CONTINUES TO BE RECEIVED AT THE NATIONAL WEATHER
SERVICE OFFICE.  TAKE SHELTER IF THESE STORMS MOVE INTO YOUR AREA.
 
IF YOU LIVE IN A HOME OR APARTMENT...SEEK SHELTER IN THE
INNERMOST PORTION OF THE BUILDING ON THE L:OWEST FLOOR.  GET TO
A BASEMENT IF ONE IS AVAILABLE.  AVOID WINDOWS AND PROTECT YOUR
BODY FROM FLYING DEBRIS WITH CUSHIONS...BLANKETS...OR PILLOWS.
 
SHEA/MORSE/RP

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 5:04 AM CDT	Tornado Warning	LSX	Monroe	41 min
Apr 15, 5:26 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Madison	44 min
Apr 15, 5:37 AM CDT	Tornado Warning	LSX	Randolph	53 min
Apr 15, 5:49 AM CDT	Tornado Warning	LSX	Washington	41 min
Apr 15, 5:53 AM CDT	Severe Thunderstorm Warning	LSX	Clinton	52 min
Apr 15, 5:53 AM CDT	Severe Thunderstorm Warning	LSX	Perry	52 min
Apr 15, 6:15 AM CDT	Severe Thunderstorm Warning	LSX	Effingham, Fayette	45 min
Apr 15, 6:15 AM CDT	Severe Thunderstorm Warning	LSX	Marion	45 min
Apr 15, 6:31 AM CDT	Severe Thunderstorm Warning	LSX	Jefferson	44 min

Nearby

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