Alert archive / Missouri / Flash Flood Warnings in 1998
Flash Flood Warning 20, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Jul 4, 1998, 7:38 AM CDT for Knox County, Shelby County, 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
- Jul 4, 1998, 7:38 AM CDT (12:38 UTC)
- Expired
- Jul 4, 1998, 10:45 AM CDT
- In force
- 3 hr
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Knox County, MO, Shelby County, MO
The radar
The St Louis radar (KLSX), 187 km from the middle of the area, began a volume at 12:40 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
Davenport, (KDVN), launched 12:00Z, 0.6 hours before the alert went out and 229 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 853 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 73 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 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, Jul 4, 6:14 AM CDT, 1 hour 24 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>075-084-085-099-041600- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 610 AM CDT SAT JUL 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 WITH LOCALLY HEAVY RAIN WILL GRADUALLY TAPER OFF ACROSS THE REGION THIS MORNING. SCATTERED THUNDERSTORMS MAY THEN REDEVELOP THIS AFTERNOON. THESE STORMS AND ANY WHICH MAY OCCUR TONIGHT ARE NOT EXPECTED TO BECOME SEVERE. GLASS
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 3, 11:40 PM CDT | Severe Thunderstorm Warning | LSX | Knox | 65 min |
| Jul 4, 2:36 AM CDT | Flash Flood Warning | LSX | Marion, Monroe, Ralls, Shelby | 5 hr |
| Jul 4, 2:36 AM CDT | Flash Flood Warning | LSX | Pike | 5 hr |
| Jul 4, 2:36 AM CDT | Flash Flood Warning | LSX | Knox | 5 hr |
| Jul 4, 7:38 AM CDT | Flash Flood Warning | LSX | Audrain, Monroe | 3 hr |
| Jul 4, 7:38 AM CDT | Flash Flood Warning | LSX | Knox, Shelby | 3 hr |
| Jul 4, 7:38 AM CDT | Flash Flood Warning | LSX | Audrain, Monroe | 3 hr |
| Jul 4, 9:02 AM CDT | Flash Flood Warning | LSX | Callaway, Cole, Osage | 5 hr |
| Jul 4, 9:02 AM CDT | Flash Flood Warning | LSX | Boone, Moniteau | 5 hr |
| Jul 4, 11:04 AM CDT | Flash Flood Warning | LSX | Monroe, Shelby | 3 hr |
| Jul 4, 11:04 AM CDT | Flash Flood Warning | LSX | Audrain | 3 hr |
Nearby
Flash Flood Warnings in Missouri, 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.