Alert archive / Missouri / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 41, NWS St. Louis, MO
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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 17, 3:58 PM CDT | Severe Thunderstorm Warning | LSX | Schuyler | 47 min |
| May 17, 4:46 PM CDT | Severe Thunderstorm Warning | LSX | Schuyler, Scotland | 59 min |
| May 17, 5:42 PM CDT | Severe Thunderstorm Warning | LSX | Sainte Genevieve | 63 min |
| May 17, 5:49 PM CDT | Severe Thunderstorm Warning | LSX | Clark, Scotland | 56 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.