Alert archive / Illinois / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 23, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Feb 11, 1999, 12:22 PM CST for Adams County, Illinois. It was in force for 48 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
- Feb 11, 1999, 12:22 PM CST (18:22 UTC)
- Expired
- Feb 11, 1999, 1:10 PM CST
- In force
- 48 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Adams County, IL
The radar
The St Louis radar (KLSX), 150 km from the middle of the area, began a volume at 18:25 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Feb 11, 11:15 AM CST | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 6.4 hours before the alert went out and 190 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
- 263 J/kg
- Mixed-layer CIN
- -346 J/kg
- Mixed-layer LCL
- 653 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 395 m²/s²
- 0-3 km storm-relative helicity
- 310 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, Feb 11, 10:25 AM CST, 1 hour 57 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>075-084-085-099-112300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1025 AM CST THU FEB 11 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 THIS AFTERNOON THROUGH EARLY THIS EVENING ACROSS THE ENTIRE REGION. THIS INCLUDES THE LARGER CITIES OF ST LOUIS...COLUMBIA...JEFFERSON CITY... HANNIBAL...FARMINGTON...STE GENEVIEVE...QUINCY IL...VANDALIA IL...AND CENTRALIA IL. A LINE OF STRONG TO SEVERE THUNDERSTORMS IS EXPECTED TO PUSH WEST TO EAST ACROSS THE AREA. THE MAIN SEVERE WEATHER THREAT WITH THIS LINE OF STORMS WILL BE DAMAGING WIND GUSTS IN EXCESS OF 60 MPH. THE THREAT OVER CENTRAL MISSOURI SHOULD BE EARLY THIS AFTERNOON...OVER EASTERN MISSOURI AROUND MIDDLE AFTERNOON... AND OVER WESTERN ILLINOIS DURING THE LATE AFTERNOON AND EARLY EVENING. STORM SPOTTER GROUPS AND EMERGENCY MANAGERS SHOULD KEEP ADVISED OF THE LATEST FORECASTS...AND MONITOR WEATHER INFORMATION FOR POSSIhBLE SKYWARN ACTION. GLASS
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 11, 11:10 AM CST | Severe Thunderstorm Warning | LSX | Knox, Scotland | 50 min |
| Feb 11, 11:28 AM CST | Severe Thunderstorm Warning | LSX | Clark | 47 min |
| Feb 11, 11:31 AM CST | Severe Thunderstorm Warning | LSX | Monroe, Shelby | 64 min |
| Feb 11, 11:54 AM CST | Severe Thunderstorm Warning | LSX | Lewis | 46 min |
| Feb 11, 12:02 PM CST | Severe Thunderstorm Warning | LSX | Marion | 48 min |
| Feb 11, 12:04 PM CST | Severe Thunderstorm Warning | LSX | Boone | 51 min |
| Feb 11, 12:25 PM CST | Severe Thunderstorm Warning | LSX | Audrain, Callaway | 50 min |
| Feb 11, 12:46 PM CST | Severe Thunderstorm Warning | LSX | Osage | 49 min |
| Feb 11, 1:12 PM CST | Severe Thunderstorm Warning | LSX | Gasconade | 48 min |
| Feb 11, 1:26 PM CST | Severe Thunderstorm Warning | LSX | Franklin | 49 min |
| Feb 11, 1:35 PM CST | Severe Thunderstorm Warning | LSX | Franklin, Warren | 50 min |
| Feb 11, 1:48 PM CST | Tornado Warning | LSX | Lincoln | 47 min |
| Feb 11, 1:56 PM CST | Tornado Warning | LSX | Pike | 49 min |
| Feb 11, 2:47 PM CST | Severe Thunderstorm Warning | LSX | Saint Louis, City of Saint Louis | 48 min |
| Feb 11, 1:54 PM CST | Tornado Warning | LSX | Brown | 46 min |
| Feb 11, 2:09 PM CST | Tornado Warning | LSX | Greene | 51 min |
| Feb 11, 2:12 PM CST | Tornado Warning | LSX | Pike | 48 min |
| Feb 11, 4:24 PM CST | Severe Thunderstorm Warning | LSX | Fayette | 51 min |
| Feb 11, 4:37 PM CST | Severe Thunderstorm Warning | LSX | Marion | 48 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; radar from the NEXRAD Level II archive.