Alert archive / Illinois / Flash Flood Warnings in 1998
Flash Flood Warning 42, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Aug 18, 1998, 7:32 AM CDT for Madison County, Illinois. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 18, 1998, 7:32 AM CDT (12:32 UTC)
- Expired
- Aug 18, 1998, 10:05 AM CDT
- In force
- 3 hr
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Madison County, IL
The radar
The St Louis radar (KLSX), 69 km from the middle of the area, began a volume at 12:33 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 nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 0.5 hours before the alert went out and 185 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
- 78 J/kg
- Mixed-layer CIN
- -276 J/kg
- Mixed-layer LCL
- 1033 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSTL 181233 FFWSTL ILC119-181505- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 732 AM CDT TUE AUG 18 1998 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * FLASH FLOOD WARNING FOR... EXTREME SOUTHWESTERN MADISON COUNTY ILLINOIS IN SOUTHWESTERN ILLINOIS * UNTIL 1005 AM CDT * AT 720 AM DOPPLER RADAR INDICATED A NARROW LINE OF THUNDERSTORMS WHICH WAS MOVING SOUTH THROUGH THE METRO AREA...CLIPPING THE SOUTHWEST CORNER OF MADISON COUNTY. GRANITE CITY AND AREAS VERY CLOSE TO THE MISSISSIPPI RIVER ARE IN THE PATH OF THESE STORMS * RAINFALL AMOUNTS OF UP TO 5 INCHES OF RAIN COULD OCCUR BETWEEN NOW AND 830 AM WITH SERIOUS FLOODING CONSEQUENCES DUE TO THE LARGE AMOUNT OF PAVED SURFACES. THIS IS A VERY SERIOUS SITUATION. DO NOT DRIVE THROUGH OR WALK NEAR FLOWING WATER. LOW AREAS AND SOME AREAS THAT NORMALLY DO NOT FLOOD WILL HAVE EXTREME FLOODING. BE CAREFUL! IF FLASH FLOODING IS OBSERVED OR IMMINENT...MOVE QUICKLY TO HIGHER GROUND. NEVER DRIVE INTO AN AREA WHERE WATER COVERS THE ROAD... ESPECIALLY UNDERPASSES AND SECONDARY ROADS. PEDIGO
What forecasters said that day
The local office's own words before this flash flood 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, Aug 18, 5:00 AM CDT, 2 hours 32 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>075-084-085-099-181700- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 500 AM CDT TUE AUG 18 1998 THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN ST LOUIS. AREAS INCLUDED ARE PORTIONS OF NORTHEAST...CENTRAL...EAST CENTRAL AND SOUTHEAST MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. THUNDERSTORMS WILL CONTINUE TO DEVELOP AND MOVE SOUTHWARD THROUGH SOUTHWESTERN ILLINOIS AND EAST CENTRAL MISSOURI THROUGH THE MORNING. SOME STORMS WILL BE STRONG...PRODUCING VERY HEAVY RAIN...SMALL HAIL... STRONG WIND GUSTS AND FREQUENT LIGHTNING...BUT LITTLE IF ANY SEVERE WEATHER WILL BE NOTED WITH THESE STORMS. STORM SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY. GKS
Special weather statement, Aug 18, 5:00 AM CDT, 2 hours 32 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>075-084-085-099-181700- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 500 AM CDT TUE AUG 18 1998 THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN ST LOUIS. AREAS INCLUDED ARE PORTIONS OF NORTHEAST...CENTRAL...EAST CENTRAL AND SOUTHEAST MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. THUNDERSTORMS WILL CONTINUE TO DEVELOP AND MOVE SOUTHWARD THROUGH SOUTHWESTERN ILLINOIS AND EAST CENTRAL MISSOURI THROUGH THE MORNING. SOME STORMS WILL BE STRONG...PRODUCING VERY HEAVY RAIN...SMALL HAIL... STRONG WIND GUSTS AND FREQUENT LIGHTNING...BUT LITTLE IF ANY SEVERE WEATHER WILL BE NOTED WITH THESE STORMS. STORM SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY. GKS
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 7:11 AM CDT | Flash Flood Warning | LSX | Saint Clair | 3 hr |
Nearby
Flash Flood Warnings in Illinois, 1998Every flash flood warning in 1998
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.