Alert archive / Illinois / Flash Flood Warnings in 1998
Flash Flood Warning 39, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Aug 5, 1998, 1:52 AM CDT for Montgomery 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 5, 1998, 1:52 AM CDT (06:52 UTC)
- Expired
- Aug 5, 1998, 4:55 AM CDT
- In force
- 3 hr
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Montgomery County, IL
The radar
The Lincoln radar (KILX), 103 km from the middle of the area, began a volume at 06:52 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 00:00Z, 6.9 hours before the alert went out and 127 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
- 421 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 1463 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSTL 050653 FFWSTL ILC135-050955- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 152 AM CDT WED AUG 5 1998 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * FLASH FLOOD WARNING FOR... MONTGOMERY COUNTY ILLINOIS IN SOUTHWESTERN ILLINOIS * UNTIL 455 AM CDT * AT 145 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO DETECT SCATTERED SHOWERS AND THUNDERSTORMS MOVING NORTHEASTWARD THROUGH MONTGOMERY COUNTY ILLINOIS. A CLUSTER OF STORMS IN THE ST LOUIS METRO WILL MOVE NORTHEASTWARD INTO MONTGOMERY COUNTY BY 230 TO 330 AM. ADDITIONAL RAIN AMOUNTS OF UP TO ONE INCH ARE POSSIBLE DURING THE NEXT TWO OR THREE HOURS. * ALTHOUGH THE RAIN HAS LESSENED IN INTENSITY DURING THE LAST HOUR ...THE RADAR ESTIMATED AMOUNTS OF 3 TO AS HIGH AS 6 INCHES OF RAIN HAVE FALLEN BETWEEN LITCHFIELD AND NOKOMIS SINCE AROUND 7 PM THIS EVENING. PORTIONS OF ROUTE 16 HAVE BEEN CLOSED BETWEEN LITCHFIELD AND NOKOMIS WITH 2 TO 4 FEET OF WATER ON THE ROAD. FLOODING PROBLEMS WILL CONTINUE FOR THE NEXT FEW HOURS AS RUNOFF CONTINUES. 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 BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. IT IS VERY DIFFICULT AT NIGHT TO TELL HOW DEEP THE WATER MAY BE. MOTORISTS SHOULD NEVER DRIVE THROUGH WATER OF UNKNOWN DEPTH. & GKS
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 9:21 PM CDT | Severe Thunderstorm Warning | LSX | Fayette, Montgomery | 49 min |
| Aug 4, 9:45 PM CDT | Flash Flood Warning | LSX | Montgomery | 4 hr |
| Aug 5, 2:38 AM CDT | Flash Flood Warning | LSX | Marion | 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.