Alert archive / Missouri / Flash Flood Warnings in 1998
Flash Flood Warning 41, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Aug 18, 1998, 7:11 AM CDT for Saint Clair County, Illinois; Saint Louis County, City of Saint Louis, Missouri. 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, 7:11 AM CDT (12:11 UTC)
- Expired
- Aug 18, 1998, 10:05 AM CDT
- In force
- 3 hr
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Saint Clair County, IL, City of Saint Louis, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 45 km from the middle of the area, began a volume at 12:10 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, 0.2 hours before the alert went out and 222 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 181212 FFWSTL ILC163-MOC189-510-181505- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 711 AM CDT TUE AUG 18 1998 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * FLASH FLOOD WARNING FOR... WESTERN ST CLAIR COUNTY IN SOUTHWESTERN ILLINOIS ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI ST. LOUIS CITY IN EAST CENTRAL MISSOURI * UNTIL 1005 AM CDT * AT 700 AM A NARROW LINE OF THUNDERSTORMS WAS LOCATED FROM WATERLOO ILLINOIS...10 MILES SOUTHEAST OF THE ARCH...NORTH TO JERSEYVILLE ILLINOIS...25 MILES NORTH OF ST LOUIS. THESE STORMS ARE FOLLOWING ONE ANOTHER OVER THE SAME PATH...INCLUDING NORTH ST LOUIS COUNTY. .. THROUGH THE CITY OF ST LOUIS..INTO WESTERN ST. CLAIR COUNTY. * PERSONS IN FLORISSANT AND EASTERN PARTS OF NORTH ST LOUIS COUNTY. THE CITY OF ST. LOUIS...AND SOUTH COUNTY ALONG INTERSTATE 55... ALONG WITH THE COLUMBIA AND WATERLOO AREA CAN EXPECT LOCAL RAINFALL AMOUNTS OF UP TO 2 TO 4 INCHES THROUGH 8 AM WITH MAJOR FLOODING OF SECONDARY AND LOW ROAD AREAS. THIS IS A VERY SERIOUS SITUATION. MUCH OF THIS RAIN IS FALLING ON AREAS WHERE THERE IS A LOT OF PAVEMENT. RUNOFF WILL BE HIGH AND WILL BE OCCURRING DURING THE MORNING RUSH HOUR. IF YOU SEE WATER ON THE ROAD...DON'T EVEN THINK ABOUT DRIVING INTO IT. IT COULD RISE VERY QUICKLY WHILE YOU ARE DRIVING THROUGH IT. TURN AROUND AND FIND AN ALTERNATE ROUTE! IF FLASH FLOODING IS OBSERVED OR IMMINENT...MOVE QUICKLY TO HIGHER GROUND. NEVER DRIVE INTO AN AREA WHERE WATER COVERS THE ROAD... ESPECIALLY LOW-WATER BRIDGES PEDIGO
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 7:32 AM CDT | Flash Flood Warning | LSX | Madison | 3 hr |
Nearby
Flash Flood Warnings in Missouri, 1998Flash 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.