Alert archive / Missouri / Flash Flood Warnings in 2012

Flash Flood Warning 24, NWS St. Louis, MO

August 31, 2012Audrain County, Missouri

NWS St. Louis, MO issued this flash flood warning at Aug 31, 2012, 7:13 PM CDT for Audrain County, Missouri. It was in force for 3 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 31, 2012, 7:13 PM CDT (00:13 UTC)
Expired: Aug 31, 2012, 10:05 PM CDT
In force: 3 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

County Audrain County, MO

The radar

The St Louis radar (KLSX), 125 km from the middle of the area, began a volume at 00:13 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 00:00Z, 0.2 hours before the alert went out and 293 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 384 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 1448 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: -24 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.

813 
WGUS53 KLSX 010013
FFWLSX
MOC007-010400-
/O.NEW.KLSX.FF.W.0024.120901T0013Z-120901T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
713 PM CDT FRI AUG 31 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 1100 PM CDT

* AT 712 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  THAT RAINFALLS IN EXCESS OF 3 INCHES HAVE OCCURRED SINCE 545 PM 
  IN A NARROW NORTHWEST-SOUTHEAST BAND CENTERED ON MEXICO.

* ALTHOUGH THE HEAVIEST RAIN WILL BE ENDING SHORTLY...RUNOFF FROM 
  THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME
  LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE AREAS IN AND NEAR
  MEXICO.

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.

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.

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.

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

&&

LAT...LON 3934 9209 3934 9173 3906 9174 3907 9211

$$

TRUETT

1 follow-up statement

491 
WGUS73 KLSX 010305
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1005 PM CDT FRI AUG 31 2012

MOC007-010317-
/O.CAN.KLSX.FF.W.0024.000000T0000Z-120901T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
AUDRAIN MO-
1005 PM CDT FRI AUG 31 2012

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR CENTRAL AUDRAIN
COUNTY IS CANCELLED...

EXCESS RUNOFF FROM HEAVY RAIN IS DIMINISHING...AND A CHECK WITH 
AUDRAIN COUNTY SHERIFFS OFFICE INDICATED THAT NO FLOODING PROBLEMS 
HAD BEEN REPORTED IN AND AROUND THE MEXICO AREA.

HOWEVER...THOSE IN THE MEXICO AREA SHOULD BE AWARE THAT THERE IS 
POTENTIAL FOR ADDITIONAL HEAVY RAIN OVERNIGHT.

LAT...LON 3934 9209 3934 9173 3906 9174 3907 9211

$$

TRUETT

Nearby

Flash Flood Warnings in Missouri, 2012 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.