Alert archive / Illinois / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 100, NWS St. Louis, MO

August 28, 1994Clinton County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 28, 1994, 5:41 PM CDT for Clinton County, Illinois. It was in force for 49 min.

The area

The counties it named.

The facts

Issued
Aug 28, 1994, 5:41 PM CDT (22:41 UTC)
Expired
Aug 28, 1994, 6:30 PM CDT
In force
49 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Clinton County, IL

The radar

The St Louis radar (KLSX), 110 km from the middle of the area, began a volume at 22:42 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, 10.7 hours before the alert went out and 182 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 1994-08-28Temperature 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 1994-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 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
1331 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
61 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 28, 4:34 PM CDT, 1 hour 7 minutes before
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Special weather statement, Aug 28, 4:36 PM CDT, 1 hour 5 minutes before
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Special weather statement, Aug 28, 4:52 PM CDT, 49 minutes before
MOZ065-063-064-ILZ058-100-102-101-290000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
452 PM CDT SUN AUG 28 1994

...STRONG THUNDERSTORMS WERE MOVING THROUGH THE METRO AREA...

AT 448 PM...RADAR INDICATED A THUNDERSTORM WITH VERY HEAVY RAIN MOVING
ACROSS NORTHERN ST LOUIS COUNTY...JUST ENTERING THE NORTHERN LIMITS OF
THE CITY OF ST LOUIS.  THIS STORM PRODUCED WIND GUSTS OF 40 MILES AN
HOUR AT LAMBERT FIELD ALONG WITH LOWERED VISIBILITIES DUE TO THE HEAVY
RAIN.

OTHER SCATTERED THUNDERSTORMS EXTENDED FROM NEAR SPRINGFIELD ILLINOIS
ACROSS ST LOUIS COUNTY TO NEAR THE ROLLA AREA.

THE HEAVIEST RAIN FROM THESE STORMS WILL MOVE JUST NORTH AND JUST SOUTH
OF ST LOUIS CITY BETWEEN 500 AND 530 PM.  THE THREAT FOR STRONG
THUNDERSTORM WILL THEN SHIFT TO COMMUNITIES EAST AND SOUTH OF ST LOUIS
INTO THE EVENING HOURS.

IF YOU ARE OUTDOORS WHEN STORMS APPROACH...SEEK SHELTER.  LIGHTNING IS
AN UNDERRATED KILLER SO STAY AWAY FROM TREES OR HIGH OBJECTS.

LISTEN TO NOAA WEATHER RADIO FOR FURTHER STATEMENTS AND POSSIBLE
WARNINGS.

SHEA
Special weather statement, Aug 28, 4:54 PM CDT, 47 minutes before
MOZ065-063-064-ILZ058-100-102-101-290000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
452 PM CDT SUN AUG 28 1994

...STRONG THUNDERSTORMS WERE MOVING THROUGH THE METRO AREA...

AT 448 PM...RADAR INDICATED A THUNDERSTORM WITH VERY HEAVY RAIN MOVING
ACROSS NORTHERN ST LOUIS COUNTY...JUST ENTERING THE NORTHERN LIMITS OF
THE CITY OF ST LOUIS.  THIS STORM PRODUCED WIND GUSTS OF 40 MILES AN
HOUR AT LAMBERT FIELD ALONG WITH LOWERED VISIBILITIES DUE TO THE HEAVY
RAIN.

OTHER SCATTERED THUNDERSTORMS EXTENDED FROM NEAR SPRINGFIELD ILLINOIS
ACROSS ST LOUIS COUNTY TO NEAR THE ROLLA AREA.

THE HEAVIEST RAIN FROM THESE STORMS WILL MOVE JUST NORTH AND JUST SOUTH
OF ST LOUIS CITY BETWEEN 500 AND 530 PM.  THE THREAT FOR STRONG
THUNDERSTORM WILL THEN SHIFT TO COMMUNITIES EAST AND SOUTH OF ST LOUIS
INTO THE EVENING HOURS.

IF YOU ARE OUTDOORS WHEN STORMS APPROACH...SEEK SHELTER.  LIGHTNING IS
AN UNDERRATED KILLER SO STAY AW4AY FROM TREES OR HIGH OBJECTS.

LISTEN TO NOAA WEATHER RADIO FOR FURTHER STATEMENTS AND POSSIBLE
WARNINGS.

SHEA
Special weather statement, Aug 28, 5:34 PM CDT, 7 minutes before
ILZ069-100-102-101-074-290030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
534 PM CDT SUN AUG 28 1994

...STRONG THUNDERSTORMS CONTINUE TO ROLL THROUGH SOUTHWEST ILLINOIS...

AT 530 PM...RADAR INDICATED A THUNDERSTORM WITH VERY HEAVY RAIN NEAR
LEBANON...IN NORTHEAST ST CLAIR COUNTY ILLINOIS.  THIS STORM PRODUCED
STRONG WIND GUSTS AND VERY HEAVY RAIN WHEN IT MOVED THROUGH O'FALLON
SHORTLY AFTER 500 PM.  THIS STORM WAS MOVING SOUTHEAST AND WILL MOVE
INTO THE COMMUNITIES OF TRENTON AND GERMANTOWN BY 600 PM.

OTHER THUNDERSTORMS EXTENDED FROM CENTRAL ILLINOIS TO JUST SOUTH OF ST
LOUIS.  THESE MAY ALSO PRODUCE LOCALLY HEAVY RAIN AND GUSTY WIND.

FOR THOSE OF YOU WITH OUTDOOR PLANS...BE READY TO SEEK SHELTER WHEN
STORMS MOVE INTO YOUR AREA.  ALONG WITH GUSTY WIND AND HEAVY RAIN...
FREQUENT LIGHTNING IS ANOTHER DANGEROUS THREAT.

SHEA
Special weather statement, Aug 28, 5:36 PM CDT, 5 minutes before
ILZ069-100-102-101-074-290030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
534 PM CDT SUN AUG 28 1994

...STRONG THUNDERSTORMS CONTINUE TO ROLL THROUGH SOUTHWEST ILLINOIS...

AT 530 PM...RADAR INDICATED A THUNDERSTORM WITH VERY HEAVY RAIN NEAR
LEBANON...IN NORTHEAST ST CLAIR COUNTY ILLINOIS.  THIS STORM PRODUCED
STRONG WIND GUSTS AND VERY HEAVY RAIN WHEN IT MOVED THROUGH O'FALLON
SHORTLY AFTER 500 PM.  THIS STORM WAS MOVING SOUTHEAST AND WILL MOVE
INTO THE COMMUNITIES OF TRENTON AND GERMANTOWN BY 600 PM.

OTHER THUNDERSTORMS EXTENDED FROM CENTRAL ILLINOIS TO JUST SOUTH OF ST
LOUIS.  THESE MAY ALSO PRODUCE LOCALLY HEAVY RAIN AND GUSTY WIND.

FOR THOSE OF YOU WITH OU|TDOOR PLANS...BE READY TO SEEK SHELTER WHEN
STORMS MOVE INTO YOUR AREA.  ALONG WITH GUSTY WIND AND HEAVY RAIN...
FREQUENT LIGHTNING IS ANOTHER DANGEROUS THREAT.

SHEA

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 28, 6:17 PM CDTSevere Thunderstorm WarningLSXJefferson, Marion43 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; radar from the NEXRAD Level II archive.