Alert archive / Missouri / Flash Flood Warnings in 2009

Flash Flood Warning 4, NWS St. Louis, MO

April 29, 2009Audrain County, Monroe County, Missouri

NWS St. Louis, MO issued this flash flood warning at Apr 29, 2009, 11:34 PM CDT for Audrain County, Monroe County, Missouri. It was in force for 6 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
Apr 29, 2009, 11:34 PM CDT (04:34 UTC)
Expired
Apr 30, 2009, 5:30 AM CDT
In force
6 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

Counties Audrain County, MO, Monroe County, MO

The radar

The St Louis radar (KLSX), 147 km from the middle of the area, began a volume at 04:37 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

TimeReportWhereRemark
Apr 30, 12:35 AM CDTFLASH FLOODMexico, MONUMEROUS RURAL ROADS NORTH OF TOWN FLOODED. MODERATE TO HEAVY RAINFALL STILL FALLING.
Apr 30, 3:35 AM CDTFLASH FLOODMexico, MOSOME STREETS IN MEXICO REMAIN UNDER WATER...AND MANY COUNTY ROADS ARE IMPASSIBLE DUE TO HIGH WATER.
Apr 30, 3:35 AM CDTFLASH FLOODParis, MOSTATE ROAD D COVERED BY 2 FEET OF WATER AND IS CLOSED...2 TO 3 MILES EAST OF HIGHWAY 15. ONE LANE OF A ROAD IN MONROE CITY IS BEING ERODED BY FAST FLOWING WATER FROM A NEARBY CREEK. CONDITIONS IN PARIS HAVE IMPROVED OVER THE LAST FEW HOURS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 4.6 hours before the alert went out and 280 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.

Skew-T log-pSkew-T log-p diagram, Davenport, at 00:00Z on 2009-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2009-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
5 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
626 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
82 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS53 KLSX 300434
FFWLSX
MOC007-137-301030-
/O.NEW.KLSX.FF.W.0004.090430T0434Z-090430T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1134 PM CDT WED APR 29 2009

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MONROE COUNTY IN NORTHEAST MISSOURI
  WESTERN AUDRAIN COUNTY IN CENTRAL MISSOURI

* UNTIL 530 AM CDT THURSDAY

* AT 1130 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THAT A BAND OF THUNDERSTORMS PRODUCING VERY HEAVY RAINFALL WAS
  MOVING NORTH ACROSS THE WARNED AREA.  THE RADAR ESTIMATES THAT
  BETWEEN ONE AND A HALF AND TWO AND A HALF INCHES OF RAINFALL HAS
  FALLEN OVER THE WESTERN PARTS OF MONROE AND AUDRAIN COUNTIES
  SINCE 7 PM THIS EVENING.  LOCAL LAW ENFORCEMENT REPORTED THAT
  SEVERAL ROADS IN PARIS WERE COVERED WITH WATER INCLUDING HIGHWAY
  15...PAYNE AND LOCUST STREETS.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MEXICO...MONROE CITY...PARIS...SANTA FE...GRANVILLE...MADISON AND
  WOODLAWN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE 
WARNED AREA BEFORE 1 AM.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN ST
LOUIS.

&&

LAT...LON 3961 9229 3961 9219 3966 9219 3966 9172
      3906 9175 3907 9211 3925 9211 3926 9231

$$

BRITT
1 follow-up statement
000 
WGUS73 KLSX 300846
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
346 AM CDT THU APR 30 2009

MOC007-137-301030-
/O.CON.KLSX.FF.W.0004.000000T0000Z-090430T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
AUDRAIN MO-MONROE MO-
346 AM CDT THU APR 30 2009

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR MONROE AND WESTERN
AUDRAIN COUNTIES UNTIL 530 AM CDT...

AT 335 AM CDT...ALTHOUGH THE HEAVY RAIN HAS DIMINISHED OVER THE 
AREA...LOCAL LAW ENFORCEMENT OFFICIALS REPORT THAT FLOODING PROBLEMS 
CONTINUE.  

IN AUDRAIN COUNTY...SEVERAL STREETS IN MEXICO REMAIN UNDER WATER 
EARLY THIS MORNING...AND MANY COUNTY ROADS ARE IMPASSIBLE.

IN MONROE COUNTY...FLOODING CONCERNS HAVE LESSENED IN PARIS BUT 
PROBLEMS CONTINUE ELSEWHERE.  STATE HIGHWAY D IS CLOSED 2 TO 3 MILES 
EAST OF HIGHWAY 15...WITH 2 FEET OF WATER COVERING THE ROAD.  IN 
MONROE CITY...ONE LANE OF A ROAD IN TOWN IS BEING ERODED BY FAST 
FLOWING WATER FROM A NEARBY CREEK.
   
PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO
CROSS BRIDGES...DIPS...OR OTHER LOW SPOTS IF WATER COVERS THE
ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON
FOOT OR IN A VEHICLE.

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 3961 9229 3961 9219 3966 9219 3966 9172
      3906 9175 3907 9211 3925 9211 3926 9231

$$

TRUETT

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 29, 9:44 PM CDTRiver Flood WarningLSXSaint Charles, Saint Louis6 days
Apr 29, 10:47 PM CDTAreal Flood AdvisoryLSXBoone, Callaway, Cole, Moniteau6 hr
Apr 30, 12:38 AM CDTFlash Flood WarningLSXBoone, Callaway, Cole, Moniteau5 hr
Apr 30, 1:10 AM CDTFlash Flood WarningLSXLewis, Marion, Ralls, Shelby6 hr
Apr 30, 1:58 AM CDTRiver Flood WarningLSXJefferson, Saint Louis27 days
Apr 30, 2:56 AM CDTRiver Flood WarningLSXLewis9 hr
Apr 30, 2:56 AM CDTRiver Flood WarningLSXMarion24 hr
Apr 30, 3:05 AM CDTRiver Flood WarningLSXMarion50 hr
Apr 30, 5:33 AM CDTAreal Flood WarningLSXAudrain, Boone, Callaway, Monroe6 hr
Apr 30, 6:59 AM CDTAreal Flood WarningLSXLewis, Marion, Pike, Ralls, Shelby5 hr
Apr 30, 9:13 AM CDTRiver Flood WarningLSXCole28 hr
Apr 30, 11:30 AM CDTAreal Flood WarningLSXAudrain, Boone, Callaway, Cole, Marion, Moniteau and 4 more6 hr
Apr 30, 2:40 PM CDTRiver Flood WarningLSXLewis5 days
Apr 30, 2:40 PM CDTRiver Flood WarningLSXMarion4 days
Apr 30, 2:40 PM CDTRiver Flood WarningLSXMarion69 hr
Apr 30, 2:40 PM CDTRiver Flood WarningLSXMarion9 days
Apr 30, 2:40 PM CDTRiver Flood WarningLSXRalls6 days
Apr 30, 2:40 PM CDTRiver Flood WarningLSXPike10 days
Apr 30, 2:40 PM CDTRiver Flood WarningLSXLincoln10 days
Apr 30, 2:40 PM CDTRiver Flood WarningLSXSaint Louis, City of Saint Louis7 days
Apr 30, 3:56 PM CDTRiver Flood WarningLSXLewis41 hr
Apr 30, 5:13 PM CDTAreal Flood WarningLSXAudrain, Boone, Callaway, Marion, Monroe, Shelby12 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.