Alert archive / Illinois / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 52, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 5, 1999, 5:08 PM CDT for Randolph County, Illinois. It was in force for 32 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 5, 1999, 5:08 PM CDT (22:08 UTC)
- Expired
- Apr 5, 1999, 5:40 PM CDT
- In force
- 32 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Randolph County, IL
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 5, 4:00 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 10.1 hours before the alert went out and 256 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
- 1168 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 80 m²/s²
- 0-3 km storm-relative helicity
- 211 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 052209 RRA SVRSTL ILC157-052240- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 508 PM CDT MON APR 5 1999 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... RANDOLPH COUNTY IN SOUTHWESTERN ILLINOIS * UNTIL 540 PM CDT * AT 507 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WESTERN RANDOLPH COUNTY... MOVING NORTHEAST AT 40 MPH. * LOCATIONS THAT WILL BE AFFECTED... CHESTER SPARTA STEELEVILLE 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. A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. CA/FG
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 5, 11:25 AM CDT, 5 hours 43 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>075-084-085-099-052300- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 1125 AM CDT MON APR 5 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 MODERATE RISK OF SEVERE THUNDERSTORMS ACROSS THE AREA THIS AFTERNOON AND TONIGHT. A VERY STRONG UPPER LEVEL DISTURBANCE WILL BE COMBINING WITH WARM AND UNSTABLE AIR TO PRODUCE WIDESPREAD THUNDERSTORM ACTIVITY FROM MID TO LATE AFTERNOON INTO THE EVENING. ALTHOUGH THUNDERSTORMS WILL BE POSSIBLE ABOUT ANY TIME...IT APPEARS THAT THE GREATEST THREAT OF SEVERE THUNDERSTORMS WILL BE DURING THE LATE AFTERNOON AND EARLY EVENING HOURS. IN ADDITION...THE HEAVY RAIN ASSOCIATED WITH THESE STORMS WILL BRING A THREAT OF FLASH FLOODING TO PARTS OF THE REGION. THE AREA OF GREATEST CONCERN IS THE AREA THAT RECEIVED HEAVY RAIN ON SATURDAY...GENERALLY ALONG AND TO THE EAST OF A ROLLA-TROY MISSOURI LINE. A FLASH FLOOD WATCH IS IN EFFECT FOR THIS PORTION OF THE AREA. SKYWARN ACTIVATION MAY BECOME NECESSARY THIS AFTERNOON AND THIS EVENING. EMERGENCY MANAGERS AND STORM SPOTTER GROUPS ARE URGED TO CAREFULLY MONITOR WEATHER DEVELOPMENTS THROUGHOUT THE DAY. GLASS
Special weather statement, Apr 5, 11:25 AM CDT, 5 hours 43 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>075-084-085-099-052300- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 1125 AM CDT MON APR 5 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 MODERATE RISK OF SEVERE THUNDERSTORMS ACROSS THE AREA THIS AFTERNOON AND TONIGHT. A VERY STRONG UPPER LEVEL DISTURBANCE WILL BE COMBINING WITH WARM AND UNSTABLE AIR TO PRODUCE WIDESPREAD THUNDERSTORM ACTIVITY FROM MID TO LATE AFTERNOON INTO THE EVENING. ALTHOUGH THUNDERSTORMS WILL BE POSSIBLE ABOUT ANY TIME...IT APPEARS THAT THE GREATEST THREAT OF SEVERE THUNDERSTORMS WILL BE DURING THE LATE AFTERNOON AND EARLY EVENING HOURS. IN ADDITION...THE HEAVY RAIN ASSOCIATED WITH THESE STORMS WILL BRING A THREAT OF FLASH FLOODING TO PARTS OF THE REGION. THE AREA OF GREATEST CONCERN IS THE AREA THAT RECEIVED HEAVY RAIN ON SATURDAY...GENERALLY ALONG AND TO THE EAST OF A ROLLA-TROY MISSOURI LINE. A FLASH FLOOD WATCH IS IN EFFECT FOR THIS PORTION OF THE AREA. SKYWARN ACTIVATION MAY BECOME NECESSARY THIS AFTERNOON AND THIS EVENING. EMERGENCY MANAGERS AND STORM SPOTTER GROUPS ARE URGED TO CAREFULLY MONITOR WEATHER DEVELOPMENTS THROUGHOUT THE DAY. GLASS
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 5, 6:26 PM CDT | Tornado Warning | LSX | Adams | 49 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 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.