Alert archive / Illinois / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 158, NWS Lincoln, IL

August 18, 1993Cass County, Morgan County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Aug 18, 1993, 8:14 PM CDT for Cass County, Morgan County, Illinois. It was in force for 46 min.

The area

The counties it named.

The facts

Issued
Aug 18, 1993, 8:14 PM CDT (01:14 UTC)
Expired
Aug 18, 1993, 9:00 PM CDT
In force
46 min
Issued by
NWS Lincoln, IL
Area
Whole counties

Counties Cass County, IL, Morgan County, IL

The nearest sounding before it

Paducah/Barkley, KY (KPAH), launched 00:00Z, 1.2 hours before the alert went out and 336 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 1993-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 48 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 00:00Z on 1993-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -11 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
48 J/kg
Mixed-layer CIN
-261 J/kg
Mixed-layer LCL
1767 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
-11 m²/s²
0-3 km storm-relative helicity
-10 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 18, 2:21 PM CDT, 5 hours 53 minutes before
ILZ009-182015-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPRINGFIELD IL
2 17 PM CDT WED AUG 18 1993

...STRONG THUNDERSTORMS CONTINUE OVER PORTIONS OF CENTRAL ILLINOIS...

AT 2 15 PM CDT...STRONG THUNDERSTORMS WERE LOCATED 30 MILES NORTH OF
ST. LOUIS AND 55 MILES SOUTH OF SPRINGFIELD ACROSS SOUTHERN MONTGOMERY
COUNTY.  BY 315 PM CDT...THE STORMS NORTH OF ST LOUIS SHOULD MOVE
INTO EXTREME SOUTHWEST MACOUPIN COUNTY NEAR MEDORA AND BRIGHTON.$
OTHER STRONG STORMS WILL MOVE OUT OF MONTGOMERY COUNTY.

PEOPLE  IN THE PATH OF THESE STORMS CAN EXPECT FREQUENT DANGEROUS
LIGHTNING...GUSTY WINDS TO 40 MPH AND HEAVY DOWNPOURS OF RAIN.

SKIPPER
Special weather statement, Aug 18, 3:17 PM CDT, 4 hours 57 minutes before
ILZ006-182115-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
317 PM CDT WED AUG 18 1993

...THUNDERSTORMS MOVING TOWARD WESTERN ILLINOIS...

AT 315 PM CDT...SHOWERS AND THUNDERSTORMS WERE OVER SOUTHEASTERN IOWA
FROM 30 MILES NORTH OF BURLINGTON TO 20 MILES SOUTH OF MOLINE. THESE
STORMS WERE MOVING TO THE SOUTH SOUTHEAST AT 30 MPH AND WILL MOVE INTO
NORTHWESTERN HENDERSON AND WARREN COUNTIES DURING THE NEXT 30 MINUTES
AND INTO KNOX COUNTY WITHIN THE NEXT 45 MINUTES.

SOME OF THESE STORMS WILL PRODUCE LOCALLY HEAVY RAINFALL...GUSTY WINDS
AND FREQUENT INTENSE LIGHTNING. PERSONS IN THE AFFECTED AREAS SHOULD
REMAIN ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS AND STAY TUNED TO
NOAA WEATHER RADIO OR LOCAL RADIO AND TELEVISION STATIONS FOR LATER
STATEMENTS.

BREESER
Special weather statement, Aug 18, 3:19 PM CDT, 4 hours 55 minutes before
ILZ006-182115-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
317 PM CDT WED AUG 18 1993

...THUNDERSTORMS MOVING TOWARD WESTERN ILLINOIS...

AT 315 PM CDT...SHOWERS AND THUNDERSTORMS WERE OVER SOUTHEASTERN IOWA
FROM 30 MILES NORTH OF BURLINGTON TO 20 MILES SOUTH OF MOLINE. THESE
STORMS WERE MOVING TO THE SOUTH SOUTHEAST AT 30 MPH AND WILL MOVE INTO
NORTHWESTERN HENDERSON AND WARREN COUNTIES DURING THE NEXT 30 MINUTES
AND INTO KNOX COUNTY WITHIN THE NEXT 45 MINUTES.

SOME OF THESE STORMS WILL PRODUCE LOCALLY HEAVY RAINFALL...GUSTY WINDS
AND FREQUENT INTENSE LIGHTNING. PERSONS IN THE AFFECTED AREAS SHOULD
REMAIN ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS AND STAY TUNED T"O
NOAA WEATHER RADIO OR LOCAL RADIO AND TELEVISION STATIONS FOR LATER
STATEMENTS.

BREESER
Special weather statement, Aug 18, 6:16 PM CDT, 1 hour 58 minutes before
ILZ009-182015-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPRINGFIELD IL
6 15 PM CDT WED AUG 18 1993

...SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 1100 PM CDT FOR
CENTRAL ILLINOIS...

AT 6 10 PM CDT...RADAR INDICATED STRONG THUNDERSTORMS NORTHWEST OF A
LINE FROM 25 MILES WEST OF PEORIA...NEAR FARMINGTON TO 10 MILES
NORTHWEST OF QUINCY...NEAR URSA.  THE STORMS WERE MOVING SOUTHEAST
AT ABOUT 25 MPH.

PEOPLE  IN THE PATH OF THESE STORMSl CAN EXPECT FREQUENT DANGEROUS
LIGHTNING...GUSTY WINDS AND HEAVY RAIN.

PEARSON
Special weather statement, Aug 18, 6:26 PM CDT, 1 hour 48 minutes before
ILZ009-190015-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPRINGFIELD IL
6 15 PM CDT WED AUG 18 1993

...SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 1100 PM CDT FOR
CENTRAL ILLINOIS...

AT 6 10 PM CDT...RADAR INDICATED STRONG THUNDERSTORMS NORTHWEST OF A
LINE FROM 25 MILES WEST OF PEORIA...NEAR FARMINGTON TO 10 MILES
NORTHWEST OF QUINCY...NEAR URSA.  THE STORMS WERE MOVING SOUTHEAST
AT ABOUT 25 MPH.

PEOPLE  IN THE PATH OF THESE STORMS CAN EXPECT FREQUENT DANGEROUS
LIGHTNING...GUSTY WINDS AND HEAVY RAIN.

PEARSON
.CORRECTED FOR EXPIRATION TIME...
Special weather statement, Aug 18, 7:16 PM CDT, 58 minutes before
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The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 18, 7:00 PM CDTSevere Thunderstorm WarningILXHancock30 min
Aug 18, 7:14 PM CDTTornado WarningILXSchuyler31 min
Aug 18, 7:52 PM CDTSevere Thunderstorm WarningILXSchuyler43 min
Aug 19, 5:00 PM CDTSevere Thunderstorm WarningILXMacoupin, Sangamon45 min
Aug 19, 5:52 PM CDTSevere Thunderstorm WarningILXMontgomery53 min
Aug 19, 5:52 PM CDTSevere Thunderstorm WarningILXChristian, Sangamon36 min
Aug 19, 6:14 PM CDTTornado WarningILXMacoupin, Montgomery31 min
Aug 19, 6:48 PM CDTTornado WarningILXMontgomery27 min
Aug 19, 6:48 PM CDTTornado WarningILXMacoupin14 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1993Every severe thunderstorm warning in 1993

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.