Alert archive / Illinois / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 71, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at May 5, 1999, 2:03 PM CDT for Marion County, Illinois. It was in force for 47 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
- May 5, 1999, 2:03 PM CDT (19:03 UTC)
- Expired
- May 5, 1999, 2:50 PM CDT
- In force
- 47 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Marion County, IL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 5, 2:15 PM CDT | Hail 1.5 | Iuka, IL |
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 nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 7.1 hours before the alert went out and 169 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
- 49 J/kg
- Mixed-layer CIN
- -201 J/kg
- Mixed-layer LCL
- 869 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 208 m²/s²
- 0-3 km storm-relative helicity
- 200 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 051904 RRA SVRSTL ILC121-051950- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 203 PM CDT WED MAY 5 1999 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN MARION COUNTY ILLINOIS IN SOUTHWESTERN ILLINOIS * UNTIL 250 PM CDT * AT 200 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WAS 15 MILES SOUTH-SOUTHEAST OF SALEM ILLINOIS... MOVING NORTHEAST AT 35 MPH. * LOCATIONS THAT WILL BE AFFECTED... HELM AT 215 PM CDT THE PRIMARY SEVERE WEATHER THREAT IS DAMAGING HAIL. LARGE HAIL CAN CAUSE EXTENSIVE PROPERTY DAMAGE AN SERIOUS INJURY TO PEOPLE CAUGHT OUTDOORS. MOVE INSIDE A STURDY BUILDING IMMEDIATELY. RP
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, May 5, 11:05 AM CDT, 2 hours 58 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>075-084-085-099-061200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 1105 AM CDT WED MAY 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 SLIGHT RISK FOR SEVERE THUNDERSTORMS THIS AFTERNOON AND THIS EVENING ACROSS SOUTHWEST ILLINOIS AND EASTERN MISSOURI...ALONG AND EAST OF A LINE FROM QUINCY TO BOWLING GREEN TO WARRENTON TO STEELVILLE. SKYWARN ACTIVATION MAY BE NEEDED THIS AFTERNOON AND THIS EVENING. A STRONG LOW PRESSURE CENTER OVER NORTHWESTERN IOWA LATE THIS MORNING WILL MOVE SLOWLY NORTH INTO SOUTHWEST MINNESOTA BY THIS EVENING. EXTENDING SOUTHWARD FROM THIS LOW PRESSURE IS A COLD FRONT THROUGH WESTERN MISSOURI. THIS COLD FRONT...WHICH WILL ACT AS A FOCUS FOR THUNDERSTORM DEVELOPMENT THIS AFTERNOON AND THIS EVENING...WILL SLOWLY MOVE EASTWARD THROUGH EASTERN MISSOURI EARLY THIS EVENING AND THROUGH SOUTHWEST ILLINOIS DURING LATE EVENING. THUNDERSTORMS THROUGH EARLY EVENING WILL MOVE TO THE NORTHEAST AT 50 MPH...WITH EXPECTED MOVMENT DURING MUCH OF THE EVENING HOURS TO BE TO THE NORTHEAST AT 30 TO 35 MPH. THUNDERSTORMS WILL BE CAPABLE OF PRODUCING HAIL TO ONE INCH IN DIAMETER AND WIND GUSTS TO 55 MPH. AGAIN...THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS FOR MUCH OF EASTERN MISSOURI AND ALL OF SOUTHWEST ILLINOIS. STAY TUNED TO NOAA WEATHER RADIO OR YOUR LOCAL RADIO OR TELEVISION STATION FOR UPDATES AND POSSIBLE WARNINGS. TES
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 5, 5:24 PM CDT | Severe Thunderstorm Warning | LSX | Washington | 36 min |
| May 5, 5:36 PM CDT | Severe Thunderstorm Warning | LSX | Marion | 49 min |
| May 5, 6:11 PM CDT | Tornado Warning | LSX | Marion | 49 min |
| May 5, 6:16 PM CDT | Severe Thunderstorm Warning | LSX | Fayette | 34 min |
| May 5, 6:23 PM CDT | Severe Thunderstorm Warning | LSX | Madison, Saint Clair | 47 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.