Alert archive / Illinois / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 150, NWS St. Louis, MO

August 18, 1993Adams County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 18, 1993, 7:10 PM CDT for Adams County, Illinois. It was in force for 65 min.

The area

The counties it named.

The facts

Issued
Aug 18, 1993, 7:10 PM CDT (00:10 UTC)
Expired
Aug 18, 1993, 8:15 PM CDT
In force
65 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Adams County, IL

The radar

The St Louis radar (KLSX), 150 km from the middle of the area, began a volume at 00:10 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, 0.2 hours before the alert went out and 390 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, 2:54 PM CDT, 4 hours 16 minutes before
MOZ012-ILZ011-182100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
251 PM CDT WED AUG 18 1993

...STRONG THUNDERSTORMS WERE SCATTERED ACROSS EAST CENTRAL MISSOURI
AND SOUTHERN ILLINOIS...

AT 245 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS IN GREENE COUNTY ILLINOIS...5 MILES SOUTH OF
CARROLLTON OR ABOUT 45 MILES NORTH OF DOWNTOWN ST LOUIS...5 MILES
SOUTH OF EDWARDSVILLE IN MADISON COUNTY ILLINOIS...OR ABOUT 20 MILES
NORTHEAST OF DOWNTOWN ST LOUIS.  STRONG STORMS WERE ALSO LOCATED
OVER DOWNTOWN ST LOUIS AND OVER PERRY COUNTY ILLINOIS NEAR DENMARK...
OR ABOUT 55 MILES SOUTHEAST OF DOWNTOWN ST LOUIS.

THESE STORMS WERE MOVING TO THE SOUTHEAST AROUND 25 MILES AN
HOUR.  PERSONS NEAR THE STORMS CAN EXPECT VERY HEAVY RAIN.  MOTORISTS
ARE URGED TO SLOW DOWN FOR THE RUSH HOUR TRAFFIC WHEN ENCOUNTERING
HEAVY RAIN.  USE YOUR HEADLIGHTS SO OTHER DRIVERS CAN SEE YOU BETTER.
Special weather statement, Aug 18, 6:00 PM CDT, 1 hour 10 minutes before
MOZ002-003-005-006-007-190000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
600 PM CDT WED AUG 18 1993

...SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 1100 PM CDT FOR
NORTH CENTRAL AND NORTHEAST MISSOURI...

AT 600 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ACROSS NORTHEAST MISSOURI IN CLARK AND
SCOTLAND COUNTIES.  THE STRONGEST STORMS WERE ABOUT 30 AND 45 MILES
NORTHEAST OF KIRKSVILLE...NEAR MEMPHIS AND KAHOKA MISSOURI.
THESE STORMS WERE MOVING TO THE SOUTHEAST AROUND 15 MILES AN HOUR.

PERSONS IN THE TOWNS/CITIES OF GORIN...WINCHESTER...ANTIOCH...AND
WYACONDA SHOULD BE ALERT FOR THE POSSIBILITY OF SEVERE THUNDERSTORMS
BETWEEN 600 PM AND 645 PM CDT.  CITIES INCLUDED IN THE SEVERE
THUNDERSTORM WATCH ARE KIRKSVILLE...HANNIBAL...MACON AND MOBERLY.
Special weather statement, Aug 18, 6:03 PM CDT, 1 hour 7 minutes before
MOZ002-003-005-006-007-190000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
600 PM CDT WED AUG 18 1993

...SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 1100 PM CDT FOR
NORTH CENTRAL AND NORTHEAST MISSOURI...

AT 600 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ACROSS NORTHEAST MISSOURI IN CLARK AND
SCOTLAND COUNTIES.  THE STRONGEST STORMS WERE ABOUT 30 AND 45 MILES
NORTHEAST OF KIRKSVILLE...NEAR MEMPHIS AND KAHOKA MISSOURI.
THESE STORMS WERE MOVING TO THE SOUTHEAST AROUND 15 MILES AN HOUR.

PERSONS IN THE TOWNS/CITIES OF GORIN...WINCHESTER...ANTIOCH...AND
WYACONDA SHOULD BE ALERT FOR THE POSSIBILITY OF SEVERE THUNDERSTORMS
BETWEEN 600 PM AND 645 PM CDT.  CITIES INCLUDED IN THE SEVERE
THUNDERSTORM WATCH ARE KIRKSVILLE...HANNIBAL...MACON AND MOBERLY.
Special weather statement, Aug 18, 6:32 PM CDT, 38 minutes before
MOZ003-007-190030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
625 PM CDT WED AUG 18 1993

...SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR NORTHEAST
MISSOURI UNTIL 1100 PM CDT...

AT 625 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ACROSS NORTHEAST MISSOURI IN CLARK COUNTY
IN KAHOKA...OR ABOUT 45 MILES NORTHEAST OF KIRKSVILLE.  AT 625 PM...
THE SHERIFFS DEPARTMENT IN KAHOKA REPORTED VERY HEAVY RAIN AND
STRONG WINDS.  PERSONS IN KAHOKA AND THE TOWNS OF WINCHESTER...
ANTIOCH AND ST PATRICK SHOULD REMAIN ALERT FOR THE POSSIBILITY
OF SEVERE THUNDERSTORMS BETWEEN 625 PM AND 715 PM CDT.

THESE STORMS WERE MOVING TO THE SOUTHEAST AROUND 15 MILES AN HOUR.
Special weather statement, Aug 18, 6:40 PM CDT, 30 minutes before
MOZ007-190045-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
640 PM CDT WED AUG 18 1993

...SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 1100 PM CDT FOR
NORTHEAST MISSOURI...

AT 640 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS WERE LOCATED NEAR MARCELLINE...15 MILES NORTH
OF QUINCY.  THIS STORM WAS MOVING TO THE SOUTHEAST AROUND 15 MILES
AN HOUR.  PERSONS IN THE TOWNS/CITIES OF LIMA...LORAINE...AND MENDON
SHOULD REMAIN ALERT FOR THE POSSIBILITY OF SEVERE THUNDERSTORMS
BETWEEN 640 PM AND 730 PM CDT.

THESE STORMS MAY CONTAIN VERY HEAVY RAIN...DEADLY LIGHTNING AND
STRONG GUSTY WINDS.  FOR YOUR PROTECTION...YOU SHOULD MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME IF THREATENING
WEATHER APPROACHES.
Special weather statement, Aug 18, 6:44 PM CDT, 26 minutes before
MOZ007-190045-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
640 PM CDT WED AUG 18 1993

...SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 1100 PM CDT FOR
NORTHEAST MISSOURI...

AT 640 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS WERE LOCATED NEAR MARCELLINE...15 MILES NORTH
OF QUINCY.  THIS STORM WAS MOVING TO THE SOUTHEAST AROUND 15 MILES
AN HOUR.  PERSONS IN THE TOWNS/CITIES OF LIMA...LORAINE...AND MENDON
SHOULD REMAIN ALERT FOR THE POSSIBILITY OF SEVERE THUNDERSTORMS
BETWEEN 640 PM AND 730 PM CDT.

THESE STORMS MAY CONTAIN VERY HEAVY RAIN...DEADLY LIGHTNING AND
STRONG GUSTY WINDS.  FOR YOUR PROTECTION...YOU SHOULD MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME IF THREATENING
WEATHER APPROACHES.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 7:45 PM CDTSevere Thunderstorm WarningLSXBrown45 min
Aug 18, 8:12 PM CDTSevere Thunderstorm WarningLSXPike, Scott48 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; radar from the NEXRAD Level II archive.