Alert archive / Missouri / Flash Flood Warnings in 2012

Flash Flood Warning 20, NWS St. Louis, MO

April 30, 2012Audrain County, Boone County, Missouri

NWS St. Louis, MO issued this flash flood warning at Apr 30, 2012, 6:29 AM CDT for Audrain County, Boone County, Missouri. It was in force for 5 hr. 1 report 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 30, 2012, 6:29 AM CDT (11:29 UTC)
Expired
Apr 30, 2012, 11:00 AM CDT
In force
5 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), 130 km from the middle of the area, began a volume at 11:29 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, 10:37 AM CDTHEAVY RAIN 3.7Columbia, MO48 HOUR TOTAL SINCE 1230 AM EARLY SUNDAY MORNING. 1.58 INCHES FROM 1230 AM EARLY SUNDAY MORNING TO 200 PM SUNDAY AFTERNOON... THEN ANOTHER 2.12 INCHES FROM 1100 PM LATE SUNDAY EVENING UNTIL 800 AM MONDAY MORNING

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

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 11.5 hours before the alert went out and 274 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, Springfield, MO at 00:00Z on 2012-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 913 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, Springfield, MO at 00:00Z on 2012-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 177 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
913 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
985 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
177 m²/s²
0-3 km storm-relative helicity
159 m²/s²
Significant tornado parameter
0.7
Supercell composite
4.3

Open this sounding in Storm Lab

The text

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

893 
WGUS53 KLSX 301129
FFWLSX
MOC007-019-301600-
/O.NEW.KLSX.FF.W.0020.120430T1129Z-120430T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
629 AM CDT MON APR 30 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 1100 AM CDT

* AT 619 AM CDT...LAW ENFORCMENT REPORTED ROAD CLOSURES OVER 
  PARTS OF MID MISSOURI...DUE TO THE HEAVY RAINS THAT FELL LATE
  SUNDAY NIGHT AND EARLY THIS MORNING.  SOME FLOODING PROBLEMS WERE
  REPORTED EARLIER THIS MORNING ALONG HIGHWAY 15 OVER AUDRAIN
  COUNTY...AND FLOODING HAS ALSO CLOSED SEVERAL ROADS OVER
  BOONE COUNTY...INCLUDING HIGHWAY Y NEAR THE BOONE-CALLAWAY COUNTY
  LINE.  

  THE LIGHT RAIN THAT IS LINGERING OVER THE AREA WILL BE
  ENDING OVER THE NEXT FEW HOURS...WITH ADDITIONAL RAINFALLS OF  
  LESS THAN ONE-QUARTER INCH.  HOWEVER...THE RUNOFF FROM THE HEAVY
  OVERNIGHT RAINS WILL ALLOW THE FLASH FLOOD THREAT TO CONTINUE 
  EVEN AFTER THE RAIN COMES TO AN END.  SOUTHERN SECTIONS OF 
  BOONE COUNTY...SOUTH OF INTERSTATE 70...ARE OF PARTICULAR
  CONCERN...WITH RAINFALL ESTIMATES IN EXCESS OF 3 INCHES IN
  THIS AREA.
 
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...ASHLAND...
  CENTRALIA...COLUMBIA...MEXICO...VANDALIA...FARBER...HALLSVILLE...
  LADDONIA...MARTINSBURG...MIDWAY...MURRY...ROCHEPORT 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.

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.

&&

LAT...LON 3924 9243 3925 9231 3935 9231 3934 9172
      3931 9143 3914 9141 3915 9162 3906 9163
      3907 9213 3890 9217 3881 9214 3871 9222
      3864 9222 3868 9235 3868 9236 3872 9234
      3876 9241 3881 9238 3883 9244 3899 9257

$$

TRUETT
1 follow-up statement
469 
WGUS73 KLSX 301554
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1054 AM CDT MON APR 30 2012

MOC007-019-301607-
/O.EXP.KLSX.FF.W.0020.000000T0000Z-120430T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BOONE MO-AUDRAIN MO-
1054 AM CDT MON APR 30 2012

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR AUDRAIN AND BOONE
COUNTIES WILL BE ALLOWED TO EXPIRE AT 1100 AM CDT...

THE FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE FOR AUDRAIN AND 
BOONE COUNTIES. HOWEVER...AN AREAL FLOOD WARNING HAS BEEN ISSUED FOR 
BOONE COUNTY TIL 5 PM DUE TO CONTINUED FLOODING OF SEVERAL SECONDARY 
ROADS. LITTLE ADDITIONAL RAINFALL IS EXPECTED TODAY.

LAT...LON 3924 9243 3925 9231 3935 9231 3934 9172
      3931 9143 3914 9141 3915 9162 3906 9163
      3907 9213 3890 9217 3881 9214 3871 9222
      3864 9222 3868 9235 3868 9236 3872 9234
      3876 9241 3881 9238 3883 9244 3899 9257

$$

BYRD

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, 10:43 PM CDTFlash Flood WarningLSXAudrain, Boone8 hr
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, 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.