Alert archive / Illinois / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 65, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 20, 1999, 11:56 PM CDT for Calhoun County, Pike County, Illinois; Pike County, Missouri. It was in force for 49 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, 11:56 PM CDT (04:56 UTC)
- Expired
- Apr 21, 1999, 12:45 AM CDT
- In force
- 49 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Calhoun County, IL, Pike County, IL, Pike County, MO
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 21, 12:05 AM CDT | Hail 0.75 | Bowling Green, 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
Lincoln, IL (KILX), launched 00:00Z, 4.9 hours before the alert went out and 215 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
- 1165 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 347 m²/s²
- 0-3 km storm-relative helicity
- 657 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSTL 210456 RRA SVRSTL ILC013-149-MOC163-210545- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 1156 PM CDT TUE APR 20 1999 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN CALHOUN COUNTY IN SOUTHWESTERN ILLINOIS PIKE COUNTY ILLINOIS IN WEST CENTRAL ILLINOIS EASTERN PIKE COUNTY MISSOURI IN NORTHEASTERN MISSOURI * UNTIL 1245 AM CDT * AT 1155 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM JUST EAST OF BOWLING GREEN MISSOURI... MOVING EAST NORTHEAST AT 30 MPH. * LOCATIONS THAT WILL BE AFFECTED... CLARKSVILLE MO PLEASANT HILL IL THE PRIMARY SEVERE FWEATHER THREAT IS DAMAGING HAIL. LARGE HAIL CAN CAUSE EXTENSIVE PROPERTY DAMAGE AN SERIOUS INJURY TO PEOPLE CAUGHT OUTDOORS. MOVE INSIDE A STURDY BUILDING IMMEDIATELY. WDB
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, 3 hours 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, 3 hours 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 21, 12:40 AM CDT | Severe Thunderstorm Warning | LSX | Brown | 35 min |
| Apr 20, 9:56 PM CDT | Severe Thunderstorm Warning | LSX | Audrain | 49 min |
| 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 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 Illinois, 1999Severe 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.