Alert archive / Missouri / Flash Flood Warnings in 2011

Flash Flood Warning 74, NWS St. Louis, MO

July 12, 2011Knox County, Missouri

NWS St. Louis, MO issued this flash flood warning at Jul 12, 2011, 2:36 PM CDT for Knox County, Missouri. It was in force for 2 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 12, 2011, 2:36 PM CDT (19:36 UTC)
Expired: Jul 12, 2011, 5:02 PM CDT
In force: 2 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

County Knox County, MO

The radar

The St Louis radar (KLSX), 200 km from the middle of the area, began a volume at 19:36 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 12, 2:36 PM CDT	FLOOD	3 N Edina, MO	HIGHWAY 15 CURRENTLY IMPASSIBLE AND CLOSED THREE TO FOUR MILES NORTH OF EDINA DUE TO WATER OVER ROADWAY.

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 12:00Z, 7.6 hours before the alert went out and 213 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1234 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -49 m²/s²
0-3 km storm-relative helicity: 12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

746 
WGUS53 KLSX 121936
FFWLSX
MOC103-130130-
/O.NEW.KLSX.FF.W.0074.110712T1936Z-110713T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
236 PM CDT TUE JUL 12 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  KNOX COUNTY IN NORTHEAST MISSOURI...

* UNTIL 830 PM CDT

* AT 236 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE      
  WARNED AREA. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  EDINA...COLONY...KNOX CITY AND PLEVNA.

HIGHWAY 15 HAS WATER RUNNING OVER IT NORTH OF EDINA...OTHER ROADS 
ARE LIKELY TO BECOME FLOODED DUE TO THE HEAVY RAINFALL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

LAT...LON 3995 9195 3995 9234 4030 9235 4030 9200
      4031 9196

$$

CVKING

1 follow-up statement

428 
WGUS73 KLSX 122202
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
502 PM CDT TUE JUL 12 2011

MOC103-122217-
/O.CAN.KLSX.FF.W.0074.000000T0000Z-110713T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KNOX MO-
502 PM CDT TUE JUL 12 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR KNOX 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 3995 9195 3995 9234 4030 9235 4030 9200
      4031 9196

$$

CVKING

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 1:58 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis	47 min
Jul 12, 2:08 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis, Shelby	52 min
Jul 12, 2:25 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	26 min
Jul 12, 2:31 PM CDT	Flash Flood Warning	LSX	City of Saint Louis	3 hr
Jul 12, 2:54 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis, Marion, Shelby	51 min
Jul 12, 3:44 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Ralls	46 min
Jul 12, 4:09 PM CDT	Severe Thunderstorm Warning	LSX	Madison	40 min
Jul 12, 4:21 PM CDT	Areal Flood Advisory	LSX	Saint Louis, City of Saint Louis	42 min
Jul 12, 4:21 PM CDT	Severe Thunderstorm Warning	LSX	Callaway	39 min
Jul 12, 4:31 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Pike	44 min
Jul 12, 4:45 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Osage	45 min
Jul 12, 5:03 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Saint Louis	57 min

Nearby

Flash Flood Warnings in Missouri, 2011 Every flash flood warning in 2011

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.