Alert archive / Missouri / Flash Flood Warnings in 2012

Flash Flood Warning 23, NWS St. Louis, MO

July 8, 2012Gasconade County, Missouri

NWS St. Louis, MO issued this flash flood warning at Jul 8, 2012, 9:55 PM CDT for Gasconade 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: Jul 8, 2012, 9:55 PM CDT (02:55 UTC)
Expired: Jul 9, 2012, 2:28 AM CDT
In force: 5 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

County Gasconade County, MO

The radar

The St Louis radar (KLSX), 81 km from the middle of the area, began a volume at 02:53 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
Jul 8, 10:12 PM CDT	HEAVY RAIN 3.5	Rosebud, MO	SINCE 845 PM

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, 2.9 hours before the alert went out and 259 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: 156 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 2059 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: -6 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.

398 
WGUS53 KLSX 090255
FFWLSX
MOC073-090900-
/O.NEW.KLSX.FF.W.0023.120709T0255Z-120709T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
955 PM CDT SUN JUL 8 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  GASCONADE COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 400 AM CDT MONDAY

* AT 952 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE   
  WARNED AREA. RADAR HAS ESTIMATED BETWEEN 2 AND 3 INCHES OF 
  RAINFALL HAS FALLEN OVER PORTIONS OF SOUTHEAST GASCONADE COUNTY 
  FROM 830 PM UNTIL CLOSE TO 10 PM. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  OWENSVILLE AND ROSEBUD.

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.

ADDITIONAL RAINFALL AMOUNTS OF AN INCH OR TWO ARE POSSIBLE AS 
ADDITIONAL THUNDERSTORMS CONTINUE TO DEVELOP TO THE NORTH AND HEAD 
SOUTH INTO THIS 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.

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 3845 9150 3850 9137 3827 9136 3821 9137
      3821 9153 3819 9153 3818 9154

$$

TES

1 follow-up statement

138 
WGUS73 KLSX 090728
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
228 AM CDT MON JUL 9 2012

MOC073-090744-
/O.CAN.KLSX.FF.W.0023.000000T0000Z-120709T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GASCONADE MO-
228 AM CDT MON JUL 9 2012

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

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 3845 9150 3850 9137 3827 9136 3821 9137
      3821 9153 3819 9153 3818 9154

$$

GLASS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 7:29 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis	46 min
Jul 8, 8:35 PM CDT	Areal Flood Advisory	LSX	Saint Louis, City of Saint Louis	6 hr
Jul 9, 12:05 AM CDT	Areal Flood Advisory	LSX	Cole, Moniteau, Osage	6 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.