Alert archive / Illinois / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 99, NWS St. Louis, MO

October 3, 1991Adams County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Oct 3, 1991, 9:49 PM CDT for Adams County, Illinois. It was in force for 41 min.

The area

The counties it named.

The facts

Issued: Oct 3, 1991, 9:49 PM CDT (02:49 UTC)
Expired: Oct 3, 1991, 10:30 PM CDT
In force: 41 min
Issued by: NWS St. Louis, MO
Area: Whole counties

County Adams County, IL

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 2.8 hours before the alert went out and 397 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: 79 J/kg
Mixed-layer CIN: -478 J/kg
Mixed-layer LCL: 649 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 417 m²/s²
0-3 km storm-relative helicity: 810 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

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, Oct 3, 4:59 PM CDT, 4 hours 50 minutes before

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Special weather statement, Oct 3, 5:06 PM CDT, 4 hours 43 minutes before

MOZ011-012-018-ILZ011-032300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
504 PM CDT THU OCT 3 1991

AT 500 PM...RADAR INDICATED A LINE OF THUNDERSTORMS WITH VERY HEAVY RAIN
FROM ABOUT 50 MILES NORTHWEST OF ST LOUIS THROUGH ST CHARLES COUNTY TO
ABOUT 40 MILES SOUTHWEST OF ST LOUIS. THESE STORMS WERE MOVING EAST AT
25 MILES AN HOUR.

VERY HEAVY RAIN HAS BEEN REPORTED IN SOUTHERN ST CHARLES COUNTY AS THESE
STORMS MOVED THROUGH.  NO SEVERE WEATHER HAS BEEN REPORTED AS OF 500 PM.

THESE STORMS WILL CONTINUE TO MOVE INTO THE ST LOUIS METRO AREA THROUGH
THE NEXT HOUR.  VERY HEAVY RAIN...SMALL HAIL...FREQUENT LIGHTNING AND
BRIEF GUSTY WINDS CAN BE EXPECTED.

IF YOU ARE OUTDOORS...MOVE INSIDE OR TO A PLACE OF SHELTER UNTIL THESE
STORMS PASS.

STAY TUNED TO NATIONAL WEATHER SERVICE RADIO FOR FURTHER STATEMENTS.

SHEA

Special weather statement, Oct 3, 6:07 PM CDT, 3 hours 42 minutes before

MOZ011-012-018-ILZ011-040000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
605 PM CDT THU OCT 3 1991

...THUNDERSTORMS WEAKENING OVER EAST CENTRAL MISSOURI AND
   SOUTHWEST ILLINOIS...

THE THUNDERSTORMS OVER EAST CENTRAL MISSOURI AND SOUTHWEST ILLINOIS
DECREASED DRAMATICALLY IN INTENSITY BETWEEN 5 AND 6 PM.  AT 605 PM...
THE LINE OF STORMS WAS IN SOUTHWEST ILLINOIS...AND STRETCHED FROM ABOUT
50 MILES NORTHWEST OF ST LOUIS NEAR LITCHFIELD ILLINOIS...TO JUST
SOUTHEAST OF ST LOUIS...NEAR BELLEVILLE.

BRIEF HEAVY RAINS MAY STILL BE POSSIBLE WITH SOME OF THE HEAVIER STORMS
IN THE LINE...BUT AT THIS TIME HAIL AND GUSTY WINDS APPEAR UNLIKELY.

THE STORMS SHOULD CONTINUE TO WEAKEN AS THEY MOVE EAST AT 25 MILES
AN HOUR.

TRUETT

Special weather statement, Oct 3, 7:24 PM CDT, 2 hours 25 minutes before

MOZ003-006-007-010-040130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
721 PM CDT THU OCT 3 1991

...STRONG THUNDERSTORMS DEVELOPING OVER NORTHEAST MISSOURI...

AT 720 PM...NATIONAL WEATHER SERVICE RADAR INDICATED STRONG
THUNDERSTORMS DEVELOPING OVER NORTHEAST MISSOURI.  THE STORMS EXTENDED
FROM 50 MILES NORTHWEST OF COLUMBIA NEAR BRUNSWICK...TO 25 MILES EAST OF
KIRKSVILLE...NEAR LA BELLE.

THE STRONGER STORMS IN THIS AREA WERE GENERALLY BETWEEN BRUNSWICK AND
KIRKSVILLE...WITH ANOTHER STRONG STORM NEAR LA BELLE.  THESE STRONGER
STORMS WERE PRODUCING BRIEF VERY HEAVY RAINS...AS WELL AS SOME SMALL
HAIL...BUT AT THIS TIME NO SEVERE WEATHER WAS INDICATED...AND NONE HAS
BEEN REPORTED.

HOWEVER...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR NORTHEAST
MISSOURI...INCLUDING THE HANNIBAL AREA...UNTIL 11 PM.  PEOPLE IN THE
WATCH AREA SHOULD REMAIN ALERT...AND CAREFULLY MONITOR LOCAL NEWS MEDIA
AND WEATHER RADIO FOR FURTHER INFORMATION.

TRUETT

Special weather statement, Oct 3, 7:46 PM CDT, 2 hours 3 minutes before

MOZALL-040700-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
745 PM CDT THU OCT 3 1991

...A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR EASTERN MISSOURI
UNTIL 200 AM CDT FRIDAY MORNING...
...A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR A LARGE PART
OF NORTHERN AND CENTRAL MISSOURI UNTIL 1100 PM CDT...

A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR EASTERN MISSOURI
UNTIL 200 AM FRIDAY MORNING.  THIS INCLUDES THE ST LOUIS METROPOLITAN
AREA AND THE QUICNY/HANNIBAL AREA.  THUNDERSTORMS WILL MOVE INTO THIS
AREA WHICH COULD PRODUCE LARGE HAIL AND/OR DAMAGING WINDS.  DEADLY
LIGHTNING AND VERY HEAVY RAINS ARE ALSO POSSIBLE.

RESIDENTS OF MISSOURI IN AND CLOSE TO THE WATSCH AREAS SHOULD KEEP
ALERT FOR RAPIDLY CHANGING WEATHER THIS EVENING AND EARLY FRIDAY
MORNING.

SHEA

Special weather statement, Oct 3, 9:29 PM CDT, 20 minutes before

MOZALL-040700-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
927 PM CDT THU OCT 3 1991

...A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR NORTHERN AND CENTRAL
MISSOURI UNTIL 200 AM CDT FRIDAY MORNING...
...A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR EASTERN MISSOURI
ALSO UNTIL 200 AM CDT FRIDAY MORNING...

A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR NORTHERN AND CENTRAL
MISSOURI UNTIL 200 AM FRIDAY MORNING.  THIS WATCH REPLACES THE OLDER
ONE THAT WAS IN EFFECT UNTIL 1100 PM.  DAMAGING THUNDERSTORM WINDS...
LARGE HAIL AND VERY HEAVY RAIN ARE POSSIBLE IN AND CLOSE TO THE
WATCH AREAS.

RESIDENTS OF MISSOURI IN AND CLOSE TO THE WATCH AREAS SHOULD KEEP
ALERT FOR RAPIDLY CHANGING WEATHER THIS EVENING AND EARLY FRIDAY
MORNING.
SHEA

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 3, 7:49 PM CDT	Severe Thunderstorm Warning	LSX	Shelby	26 min
Oct 3, 8:05 PM CDT	Severe Thunderstorm Warning	LSX	Adair	40 min
Oct 3, 8:15 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Monroe, Ralls, Shelby	45 min
Oct 3, 8:47 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Shelby	43 min
Oct 3, 8:47 PM CDT	Severe Thunderstorm Warning	LSX	Adair	43 min
Oct 3, 9:08 PM CDT	Severe Thunderstorm Warning	LSX	Adair	52 min
Oct 3, 9:27 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Shelby	63 min
Oct 3, 9:53 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Shelby	52 min
Oct 3, 10:21 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Shelby	54 min
Oct 4, 4:12 PM CDT	Severe Thunderstorm Warning	LSX	Pike	48 min
Oct 4, 4:50 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Warren	55 min
Oct 4, 5:33 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles	42 min
Oct 4, 5:41 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln	57 min
Oct 4, 6:18 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles, Saint Louis	57 min
Oct 4, 6:18 PM CDT	Severe Thunderstorm Warning	LSX	City of Saint Louis	57 min
Oct 4, 8:37 AM CDT	Severe Thunderstorm Warning	LSX	Adams	38 min
Oct 4, 9:09 AM CDT	Severe Thunderstorm Warning	LSX	Brown, Pike	51 min
Oct 4, 4:56 PM CDT	Severe Thunderstorm Warning	LSX	Pike	49 min
Oct 4, 5:23 PM CDT	Severe Thunderstorm Warning	LSX	Scott	44 min
Oct 4, 5:41 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Jersey	57 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1991 Every severe thunderstorm warning in 1991

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.