Alert archive / Missouri / Flash Flood Warnings in 2012

Flash Flood Warning 13, NWS St. Louis, MO

March 17, 2012Osage County, Missouri

NWS St. Louis, MO issued this flash flood warning at Mar 17, 2012, 6:23 PM CDT for Osage County, Missouri. It was in force for 4 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: Mar 17, 2012, 6:23 PM CDT (23:23 UTC)
Expired: Mar 17, 2012, 10:13 PM CDT
In force: 4 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

County Osage County, MO

The radar

The St Louis radar (KLSX), 115 km from the middle of the area, began a volume at 23:26 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
Mar 17, 6:25 PM CDT	FLASH FLOOD	10 Se Rich Fountain, MO	CREEKS REMAIN OUT OF THEIR BANKS AND GRAVEL ROADS REMAIN FLOODED

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 12:00Z, 11.4 hours before the alert went out and 238 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: 1549 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 724 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 83 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.

149 
WGUS53 KLSX 172323
FFWLSX
MOC151-180530-
/O.NEW.KLSX.FF.W.0013.120317T2323Z-120318T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
623 PM CDT SAT MAR 17 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 1230 AM CDT

* AT 620 PM CDT...A CHECK WITH OSAGE COUNTY 911 CENTER INDICATED
  THAT FLOODING PROBLEMS WERE PERSISTING ACROSS THE COUNTY.  CREEKS
  REMAINED OUT OF THEIR BANKS AND NUMEROUS GRAVEL ROADS WERE UNDER 
  WATER NEAR BELLE...AND A CREEK SOUTHEAST OF CHAMOIS HAD ALSO
  BEGUN TO LEAVE ITS BANKS.   RADAR INDICATED THAT SCATTERED
  THUNDERSTORMS WILL BE PRODUCING ISOLATED DOWNPOURS ACROSS
  MOST OF THE COUNTY THROUGH 730 PM...HOWEVER THE FLASH FLOODING
  THREAT WILL CERTAINLY PERSIST SEVEARL HOURS AFTER THE RAIN ENDS.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  LINN...CHAMOIS...FREEBURG...RICH FOUNTAIN AND WESTPHALIA.

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.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

&&

LAT...LON 3837 9219 3838 9214 3841 9211 3844 9216
      3847 9217 3846 9209 3848 9202 3855 9203
      3862 9191 3866 9187 3868 9177 3871 9173
      3870 9164 3829 9164 3829 9165 3829 9220

$$

TRUETT

1 follow-up statement

738 
WGUS73 KLSX 180313
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1013 PM CDT SAT MAR 17 2012

MOC151-180325-
/O.CAN.KLSX.FF.W.0013.000000T0000Z-120318T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
OSAGE MO-
1013 PM CDT SAT MAR 17 2012

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

RAIN HAS ENDED OVER OSAGE COUNTY AND NO ADDITIONAL RAINFALL IS 
EXPECTED. AT 1007 PM...OSAGE COUNTY EMERGENCY MANAGEMENT INDICATED 
THAT THE FLASH FLOODING HAS SUBSIDED. SO THE FLASH FLOOD WARNING HAS 
BEEN CANCELLED.

LAT...LON 3837 9219 3838 9214 3841 9211 3844 9216
      3847 9217 3846 9209 3848 9202 3855 9203
      3862 9191 3866 9187 3868 9177 3871 9173
      3870 9164 3829 9164 3829 9165 3829 9220

$$

BYRD

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 17, 2:22 PM CDT	Flash Flood Warning	LSX	Osage	4 hr
Mar 17, 3:38 PM CDT	Flash Flood Watch	LSX	Crawford, Franklin, Gasconade, Jefferson, Osage, Saint Charles and 6 more	6 hr
Mar 17, 3:59 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	46 min
Mar 17, 4:54 PM CDT	Areal Flood Advisory	LSX	Saint Louis, City of Saint Louis	4 hr
Mar 17, 5:13 PM CDT	Areal Flood Advisory	LSX	Saint Charles	4 hr
Mar 17, 5:51 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	25 min
Mar 17, 6:13 PM CDT	Flash Flood Warning	LSX	Crawford	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.