Alert archive / Missouri / Flash Flood Warnings in 2012

Flash Flood Warning 16, NWS St. Louis, MO

April 29, 2012Audrain County, Boone County, Missouri

NWS St. Louis, MO issued this flash flood warning at Apr 29, 2012, 10:43 PM CDT for Audrain County, Boone County, Missouri. It was in force for 8 hr. 2 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, 2012, 10:43 PM CDT (03:43 UTC)
Expired
Apr 30, 2012, 6:30 AM CDT
In force
8 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

Counties Audrain County, MO, Boone County, MO

The radar

The St Louis radar (KLSX), 126 km from the middle of the area, began a volume at 03:44 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, 3:00 AM CDTFLASH FLOOD8 N Mexico, MOWATER OVER ROAD 8 MILES NORTH OF MEXICO ON HIGHWAY 15.
Apr 30, 4:32 AM CDTFLASH FLOOD1 Nw Centralia, MOROAD CLOSED DUE TO FLOODING AT INTERSECTION OF SCHUNEMEYER ROAD AND HIGHWAY 22.

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, 3.7 hours before the alert went out and 298 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 2012-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 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 2012-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 353 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
437 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
353 m²/s²
0-3 km storm-relative helicity
432 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.

512 
WGUS53 KLSX 300343
FFWLSX
MOC007-019-301130-
/O.NEW.KLSX.FF.W.0016.120430T0343Z-120430T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1043 PM CDT SUN APR 29 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  AUDRAIN COUNTY IN CENTRAL MISSOURI...
  NORTHERN BOONE COUNTY IN CENTRAL MISSOURI...

* UNTIL 630 AM CDT MONDAY

* AT 1036 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL
  EXTENDED FROM 5 MILES NORTH OF MEXICO TO HARRISBURG.  RADAR
  ESTIMATES THAT BETWEEN 1 AND 3 INCHES OF RAINFALL HAS FALLEN IN 
  THIS AREA SINCE 930 PM CDT.  RADAR INDICATES ADDITIONAL STORMS
  OVER WEST CENTRAL MISSOURI WILL MOVE ACROSS THE WARNING AREA
  THROUGH MIDNIGHT BRINGING ADDITIONAL HEAVY RAINFALL.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CENTRALIA...MEXICO...VANDALIA...FARBER...HALLSVILLE...LADDONIA... 
  MARTINSBURG...MURRY AND STURGEON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3924 9244 3925 9232 3935 9231 3934 9172
      3932 9172 3931 9143 3914 9141 3915 9162
      3906 9163 3907 9213 3901 9214 3901 9256

$$

BRITT
1 follow-up statement
449 
WGUS73 KLSX 300803
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
303 AM CDT MON APR 30 2012

MOC007-019-301130-
/O.CON.KLSX.FF.W.0016.000000T0000Z-120430T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BOONE MO-AUDRAIN MO-
303 AM CDT MON APR 30 2012

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR AUDRAIN AND NORTHERN
BOONE COUNTIES UNTIL 630 AM CDT...

AT 301 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
MODERATE RAIN CONTINUING OVER THE WARNED AREA. RAINFALL AMOUNTS OF 2 
TO 3 INCHES HAVE FALLEN OVERNIGHT...AND AN ADDITIONAL HALF TO THREE 
QUARTERS OF AN INCH IS LIKELY BY DAYBREAK.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO 
OCCUR ALONG STREAMS AND CREEKS. HIGHWAY 15 NORTH OF MEXICO HAS BEEN 
FLOODED DUE TO THE HEAVY RAINFALL...AND MANY OTHER ROADS MAY HAVE 
WATER FLOWING ACROSS THEM.

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.

&&

LAT...LON 3924 9244 3925 9232 3935 9231 3934 9172
      3932 9172 3931 9143 3914 9141 3915 9162
      3906 9163 3907 9213 3901 9214 3901 9256

$$

CVKING

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 29, 8:11 PM CDTRiver Flood WarningLSXCole45 hr
Apr 29, 10:10 PM CDTRiver Flood WarningLSXLincoln11 hr
Apr 29, 10:13 PM CDTSevere Thunderstorm WarningLSXKnox, Lewis47 min
Apr 29, 10:45 PM CDTSevere Thunderstorm WarningLSXAudrain, Monroe, Ralls45 min
Apr 30, 12:02 AM CDTFlash Flood WarningLSXBoone7 hr
Apr 30, 2:40 AM CDTFlash Flood WarningLSXCallaway6 hr
Apr 30, 6:29 AM CDTFlash Flood WarningLSXAudrain, Boone5 hr
Apr 30, 8:31 AM CDTAreal Flood WarningLSXCallaway6 hr
Apr 30, 10:48 AM CDTAreal Flood WarningLSXBoone6 hr
Apr 30, 4:51 PM CDTAreal Flood WarningLSXBoone6 hr
Apr 30, 5:27 PM CDTRiver Flood WarningLSXLincoln17 hr

Nearby

Flash Flood Warnings in Missouri, 2012Every flash flood warning in 2012

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.