Alert archive / Missouri / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 61, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 20, 1999, 9:56 PM CDT for Audrain County, Missouri. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 20, 1999, 9:56 PM CDT (02:56 UTC)
- Expired
- Apr 20, 1999, 10:45 PM CDT
- In force
- 49 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Audrain County, MO
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 20, 9:15 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 2.9 hours before the alert went out and 290 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 986 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 215 m²/s²
- 0-3 km storm-relative helicity
- 513 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
999 WUUS1 KSTL 210257 RRA SVRSTL MOC007-210345- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 956 PM CDT TUE APR 20 1999 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... AUDRAIN COUNTY IN CENTRAL MISSOURI * UNTIL 1045 PM CDT * AT 955 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM ALONG THE BOONE-AUDRAIN COUNTY LINE...JUST EAST OF CENTRALIA... MOVING EAST-NORTHEAST AT 30 MPH. * LOCATIONS THAT WILL BE AFFECTED... THOMPSON LADDONIA SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND GUSTS IN EXCESS OF 60 MPH...DAMAGING HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OR YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. TRUETT/BRITT
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, Apr 20, 8:15 PM CDT, 1 hour 41 minutes before
ILZ058>060-064-065-069-070-074-079-095>102-MOZ009-010-018-019-026- 027-034>036-041-042-047>052-059>065-072>075-084-085-099-210700- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 815 PM CDT TUE APR 20 1999 THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NWS OFFICE IN ST. LOUIS. AREAS INCLUDED ARE PARTS OF CENTRAL...NORTHEAST AND EAST CENTRAL MISSOURI...AND SOUTHWEST ILLINOIS. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER ALL OF THE COUNTY WARNING AREA TONIGHT. ALTHOUGH THE WEATHER WAS TRANQUIL ACROSS THE AREA EARLY THIS EVENING...THE LATEST WEATHER DATA INDICATES THAT THUNDERSTORMS WILL BE DEVELOPING ACROSS THE REGION AS THE NIGHT PROGRESSES...AND THERE IS A CHANCE THAT SOME OF THESE STORMS MAY BECOME SEVERE. SEVERE WEATHER SPOTTERS SHOULD MONITOR LATEST FORECASTS AND OUTLOOKS AS SKYWARN ACTIVATION MAY BE REQUIRED LATE THIS EVENING...AND DURING THE PREDAWN HOURS. TRUETT
Special weather statement, Apr 20, 8:15 PM CDT, 1 hour 41 minutes before
ILZ058>060-064-065-069-070-074-079-095>102-MOZ009-010-018-019-026- 027-034>036-041-042-047>052-059>065-072>075-084-085-099-210700- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 815 PM CDT TUE APR 20 1999 THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NWS OFFICE IN ST. LOUIS. AREAS INCLUDED ARE PARTS OF CENTRAL...NORTHEAST AND EAST CENTRAL MISSOURI...AND SOUTHWEST ILLINOIS. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER ALL OF THE COUNTY WARNING AREA TONIGHT. ALTHOUGH THE WEATHER WAS TRANQUIL ACROSS THE AREA EARLY THIS EVENING...THE LATEST WEATHER DATA INDICATES THAT THUNDERSTORMS WILL BE DEVELOPING ACROSS THE REGION AS THE NIGHT PROGRESSES...AND THERE IS A CHANCE THAT SOME OF THESE STORMS MAY BECOME SEVERE. SEVERE WEATHER SPOTTERS SHOULD MONITOR LATEST FORECASTS AND OUTLOOKS AS SKYWARN ACTIVATION MAY BE REQUIRED LATE THIS EVENING...AND DURING THE PREDAWN HOURS. TRUETT
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 10:45 PM CDT | Severe Thunderstorm Warning | LSX | Lewis, Marion | 35 min |
| Apr 20, 10:51 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Monroe | 49 min |
| Apr 20, 11:13 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 47 min |
| Apr 20, 11:56 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 49 min |
| Apr 21, 1:36 AM CDT | Severe Thunderstorm Warning | LSX | Audrain | 49 min |
| Apr 21, 2:28 AM CDT | Severe Thunderstorm Warning | LSX | Audrain | 32 min |
| Apr 21, 2:36 AM CDT | Severe Thunderstorm Warning | LSX | Saint Charles, Warren | 49 min |
Nearby
Severe Thunderstorm Warnings in Missouri, 1999Every severe thunderstorm warning in 1999
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.