Alert archive / Missouri / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 41, NWS St. Louis, MO

May 17, 1991Lewis County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 17, 1991, 6:39 PM CDT for Lewis County, Missouri. It was in force for 51 min.

The area

The counties it named.

The facts

Issued
May 17, 1991, 6:39 PM CDT (23:39 UTC)
Expired
May 17, 1991, 7:30 PM CDT
In force
51 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Lewis County, MO

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 11.7 hours before the alert went out and 357 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, Topeka, KS at 12:00Z on 1991-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1042 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, Topeka, KS at 12:00Z on 1991-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 square meters per square second.1939587897Sfc1 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
1042 J/kg
Mixed-layer CIN
-141 J/kg
Mixed-layer LCL
722 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
199 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KSTL 172339
SVRSTL
MOC111-180030-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
639 PM CDT FRI MAY 17 1991
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  730 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTHEAST MISSOURI
 
   ...NORTH CENTRAL LEWIS COUNTY
 
AT 636...RADAR INDICATED A SEVERE THUNDERSTORM WAS IN EXTREME SOUTHWEST
CLARK COUNTY AND WAS TURNING TO THE EAST SOUTHEAST...HEADING TOWARD
NORTHERN LEWIS COUNTY. THIS STORM HAS A HISTORY OF LARGE HAIL AND SOME
WIND DAMAGE. THE STORM WILL MOVE NEAR DEER RIDGE...OR ABOUT 40 MILES
EAST OF KIRKSVILLE.
 
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
TUCKER

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, May 17, 3:57 PM CDT, 2 hours 42 minutes before
MOZ001>003-005>007-172200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
355 PM CDT FRI MAY 17 1991

...A TORNADO WATCH IS IN EFFECT FOR NORTH CENTRAL AND NORTHEAST
   MISSOURI TILL 9 PM...

AT 345 PM...THUNDERSTERSTORMS WERE OCCURRING OVER NORTH CENTRAL
MISSOURI. THE STRONGEST STORM WAS NORTHEAST OF TRENTON.  THE STORM
WAS MOVING NORTHEAST AT 25 MILES AN HOUR.

THUNDERSTORMS WILL CONTINUE TO DEVELOP OVER THIS PART OF MISSOURI
LATE THIS AFTERNOON AND THIS EVENING.  SOME OF THESE STORMS WILL
REACH SEVERE LIMITS AND MAY ALSO PRODUCE TORNADOES.

IF YOU ARE IN NORTHEAST AND NORTH CENTRAL MISSOURI...OR ARE PLANNING
TO TRAVEL INTO THIS AREA...MONITOR THE WEATHER CONDITIONS CLOSELY BY
LISTENING TO NOAA WEATHER RADIO AND LOCAL RADIO AND T.V. STATIONS. BE
PREPARED TO TAKE IMMEDIATE ACTION IN THE EVENT THAT SEVERE WEATHER
DEVELOPES.

FERRY
Special weather statement, May 17, 5:09 PM CDT, 1 hour 30 minutes before
MOZ012-018-172300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
500 PM CDT FRI MAY 17 1991

...THUNDERSTORMS WERE DEVELOPING OVER SOUTHEAST MISSOURI...

AT 500 PM...A STRONG THUNDERSTORM WAS LOCATED JUST EAST OF MONTAUK
STATE PARK IN SOUTHWEST DENT COUNTY.  THIS IS ABOUT 50 MILES SOUTH OF
ROLLA.

SOME PEA SIZE HAIL WAS REPORTED FROM THIS STORM AT MONTAUK STATE
PARK JUST BEFORE 5 PM.  IN ADDITION TO THE HAIL...EXTREMELY HEAVY
RAINS WILL ALSO OCCUR WITH THIS STORM.

THIS STORM WAS MOVING NORTHEAST AT 20 MILES AN HOUR AND WILL BE MOVING
THROUGH OR NEAR THE TOWNS OF GLADDEN AND SALEM BY 6 PM.

PERSONS IN THIS AREA SHOULD MONITOR THE WEATHER CLOSELY AND BE PREPARED
TO MOVEt TO SAFETY IN THE EVENT THIS STORM INTENSIFIES.

FERRY

The office that day

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

IssuedProductOfficeCountiesLasted
May 17, 3:58 PM CDTSevere Thunderstorm WarningLSXSchuyler47 min
May 17, 4:46 PM CDTSevere Thunderstorm WarningLSXSchuyler, Scotland59 min
May 17, 5:42 PM CDTSevere Thunderstorm WarningLSXSainte Genevieve63 min
May 17, 5:49 PM CDTSevere Thunderstorm WarningLSXClark, Scotland56 min

Nearby

Severe Thunderstorm Warnings in Missouri, 1991Every 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.