Alert archive / Missouri / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 62, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 20, 1999, 10:45 PM CDT for Lewis County, Marion County, Missouri. It was in force for 35 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Apr 20, 1999, 10:45 PM CDT (03:45 UTC)
- Expired
- Apr 20, 1999, 11:20 PM CDT
- In force
- 35 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Lewis County, MO, Marion County, MO
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 20, 10:50 PM CDT | Hail 1 | Warren, MO |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
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, 3.8 hours before the alert went out and 210 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
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, Apr 20, 8:15 PM CDT, 2 hours 30 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, 2 hours 30 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, 9:56 PM CDT | Severe Thunderstorm Warning | LSX | Audrain | 49 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 |
| Apr 21, 12:40 AM CDT | Severe Thunderstorm Warning | LSX | Brown | 35 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.