Alert archive / Missouri / Flash Flood Warnings in 2009
Flash Flood Warning 71, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Sep 20, 2009, 6:59 AM CDT for Franklin County, Saint Charles County, Warren County, Missouri. It was in force for 3 hr. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 20, 2009, 6:59 AM CDT (11:59 UTC)
- Expired
- Sep 20, 2009, 10:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Franklin County, MO, Saint Charles County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 36 km from the middle of the area, began a volume at 12:00 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 20, 7:22 AM CDT | FLASH FLOOD | Washington, MO | SEVERAL CALLS RECEIVED OF WATER FLOODING HOMES. DEPTH OF FLOOD WATER AND SOURCE ARE UNKNOWN. |
| Sep 20, 7:25 AM CDT | FLASH FLOOD | Union, MO | FLAT CREEK IS OUT OF ITS BANKS NEAR THE CITY PARK AND HAS FLOODED THE ROADWAY. ROADWAY IS BEING BARRICADED. |
| Sep 20, 8:40 AM CDT | HEAVY RAIN 4.2 | 2 Nnw Union, MO |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 12.0 hours before the alert went out and 276 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
- 1614 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 38 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 201159 FFWLSX MOC071-183-219-201500- /O.NEW.KLSX.FF.W.0071.090920T1159Z-090920T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 659 AM CDT SUN SEP 20 2009 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL FRANKLIN COUNTY IN EAST CENTRAL MISSOURI... SOUTHEASTERN WARREN COUNTY IN EAST CENTRAL MISSOURI... SOUTHWESTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI... * UNTIL 1000 AM CDT * AT 657 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. DOPPLER RADAR INDICATES 3 TO 4 INCHES OF RAIN HAS FALLEN SINCE 430 AM ALONG AN AXIS FROM WASHINGTON TO UNION TO STANTON. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...ST. CLAIR...UNION...WASHINGTON...BEAUFORT...DUTZOW...MARTHASVILLE...NEW MELLE AND PARKWAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE WARNED AREA. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. 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. && LAT...LON 3872 9087 3821 9097 3822 9128 3874 9113 $$ GLASS
1 follow-up statement
000 WGUS73 KLSX 201500 FFSLSX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1000 AM CDT SUN SEP 20 2009 MOC071-183-219-201515- /O.EXP.KLSX.FF.W.0071.000000T0000Z-090920T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ FRANKLIN MO-ST. CHARLES MO-WARREN MO- 1000 AM CDT SUN SEP 20 2009 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHEASTERN WARREN...SOUTHWESTERN ST. CHARLES AND CENTRAL FRANKLIN COUNTIES HAS BEEN ALLOWED TO EXPIRE... EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED... PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY. LAT...LON 3872 9087 3821 9097 3822 9128 3874 9113 $$ TILLY
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 5:28 AM CDT | Flash Flood Warning | LSX | Callaway, Cole | 3 hr |
| Sep 20, 6:34 AM CDT | Areal Flood Advisory | LSX | Franklin, Saint Charles, Warren | 3 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.