Alert archive / Missouri / Flash Flood Warnings in 2009
Flash Flood Warning 67, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Aug 17, 2009, 11:44 AM CDT for Shelby County, Missouri. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 17, 2009, 11:44 AM CDT (16:44 UTC)
- Expired
- Aug 17, 2009, 5:30 PM CDT
- In force
- 6 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
County Shelby County, MO
The radar
The St Louis radar (KLSX), 169 km from the middle of the area, began a volume at 16:45 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, 4.7 hours before the alert went out and 245 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
- 64 J/kg
- Mixed-layer CIN
- -98 J/kg
- Mixed-layer LCL
- 616 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -88 m²/s²
- 0-3 km storm-relative helicity
- -20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS53 KLSX 171644
FFWLSX
MOC205-172230-
/O.NEW.KLSX.FF.W.0067.090817T1644Z-090817T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1144 AM CDT MON AUG 17 2009
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SHELBY COUNTY IN NORTHEAST MISSOURI...
* UNTIL 530 PM CDT
* AT 1140 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
WARNED AREA. THE RAINFALL FROM THE STORMS OF LATE THIS MORNING HAS
COMBINED WITH THE WET WEATHER OF SUNDAY AND SUNDAY NIGHT TO PRODUCE
FLASH FLOODING. HIGHWAY DD AT MAUD IS NOW CLOSED...AS WELL AS
HIGHWAY A SOUTH OF LENTNER. IN ADDITION...FLOODING HAS BEGUN
TO THREATEN HIGHWAY 36 ONE AND ONE-HALF MILES WEST OF
HIGHWAY TT...BETWEEN CLARENCE AND LENTER.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
SHELBINA...CLARENCE...EMDEN...MAUD AND SHELBYVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS... OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING
STREAM... EVEN A SMALL ONE...ON FOOT OR IN A VEHICLE.
TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN ST
LOUIS.
&&
LAT...LON 3995 9185 3966 9186 3966 9219 3961 9220
3961 9230 3995 9229
$$
TRUETT1 follow-up statement
000
WGUS73 KLSX 171851
FFSLSX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
151 PM CDT MON AUG 17 2009
MOC205-172230-
/O.CON.KLSX.FF.W.0067.000000T0000Z-090817T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SHELBY MO-
151 PM CDT MON AUG 17 2009
...FLASH FLOOD WARNING FOR REMAINS IN EFFECT FOR SHELBY COUNTY UNTIL
530 PM CDT...
AT 147 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THAT RAIN AND SCATTERED THUNDERSTORMS WILL CONTINUE ACROSS THE AREA
THROUGH 4 PM. FLASH FLOODING HAS ALREADY BEEN REPORTED...ESPECIALLY
IN SOUTHERN SECTIONS OF THE COUNTY...AND THIS ADDITIONAL HEAVY RAIN
WILL ENHANCE THE FLASH FLOOD THREAT THROUGHOUT THE AFTERNOON.
ADDITIONAL RAINS OF ONE-HALF TO ONE INCH WILL BE POSSIBLE THROUGH 4
PM.
RUNOFF FROM THIS RAINFALL WILL CONTINUE THE FLASH FLOODING THREAT
ACROSS THE COUNTY. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING
INCLUDE...SHELBINA...CLARENCE...EMDEN...MAUD AND SHELBYVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
THERE ARE DOZENS OF LOW WATER CROSSINGS WHICH ARE POTENTIALLY
DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS FLOODED
ROADS. FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW INCHES OF SWIFTLY
FLOWING WATER TO CARRY VEHICLES AWAY.
REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY SO THAT THEY
MAY TAKE APPROPRIATE ACTION TO CLOSE FLOODED ROADWAYS. THEY WILL
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST LOUIS.
&&
LAT...LON 3995 9185 3966 9186 3966 9219 3961 9220
3961 9230 3995 9229
$$
TRUETTThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 11:54 PM CDT | Flash Flood Warning | LSX | Knox | 6 hr |
| Aug 17, 1:57 AM CDT | Flash Flood Warning | LSX | Knox, Lewis, Marion, Monroe, Shelby | 4 hr |
| Aug 17, 4:09 AM CDT | Flash Flood Watch | LSX | Knox, Lewis, Marion, Monroe, Pike, Ralls and 1 more | 11 hr |
| Aug 17, 2:16 PM CDT | Areal Flood Advisory | LSX | Knox, Lewis, Marion, Monroe, Ralls | 5 hr |
| Aug 17, 3:10 PM CDT | River Flood Warning | LSX | Lewis | 28 hr |
| Aug 17, 5:14 PM CDT | Areal Flood Advisory | LSX | Saint Charles, Saint Louis, City of Saint Louis | 6 hr |
| Aug 17, 5:28 PM CDT | Areal Flood Warning | LSX | Shelby | 12 hr |
Nearby
Flash Flood Warnings in Missouri, 2009Every flash flood warning in 2009
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.