Alert archive / Alabama / Flash Flood Warnings in 2008

Flash Flood Warning 7, NWS Mobile, AL

April 11, 2008Choctaw County, Clarke County, Washington County, Alabama

NWS Mobile, AL issued this flash flood warning at Apr 11, 2008, 5:52 PM CDT for Choctaw County, Clarke County, Washington County, Alabama. It was in force for 113 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 11, 2008, 5:52 PM CDT (22:52 UTC)
Expired: Apr 11, 2008, 7:45 PM CDT
In force: 113 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

Counties Choctaw County, AL, Clarke County, AL, Washington County, AL

The radar

The Mobile radar (KMOB), 123 km from the middle of the area, began a volume at 22:52 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

Jackson, MS (KJAN), launched 12:00Z, 10.9 hours before the alert went out and 192 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: 1611 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 542 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 332 m²/s²
0-3 km storm-relative helicity: 358 m²/s²
Significant tornado parameter: 3.5
Supercell composite: 13.4

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KMOB 112253
FFWMOB
ALC023-025-129-120045-
/O.NEW.KMOB.FF.W.0007.080411T2252Z-080412T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
552 PM CDT FRI APR 11 2008

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN CHOCTAW COUNTY IN SOUTHWEST ALABAMA...
  NORTHWESTERN CLARKE COUNTY IN SOUTHWEST ALABAMA...
  NORTHWESTERN WASHINGTON COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 745 PM CDT

* AT 544 PM CDT...FLASH FLOODING WAS REPORTED FROM A THUNDERSTORM
  OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WOODS
  BLUFF...WOMACK HILL...WEST BEND...TALLAHATTA SPRINGS...SOUWILPA...
  SILAS...SERVICE...OPINE...MORVIN...HOLTAMVILLE...COFFEEVILLE...
  CHILTON...BOLINGER...BLADON SPRINGS...BASHI AND BARRYTOWN

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...
EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER
GROUND.

LAT...LON 3174 8846 3199 8805 3200 8784 3179 8776
      3162 8799 3157 8845
TIME...MOT...LOC 2252Z 180DEG 0KT 3173 8834

$$

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 11, 11:45 AM CDT	Flash Flood Watch	MOB	Covington, Escambia	11 hr
Apr 11, 2:07 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke	38 min
Apr 11, 4:22 PM CDT	Tornado Warning	MOB	Choctaw, Washington	53 min
Apr 11, 4:53 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Washington	52 min
Apr 11, 5:15 PM CDT	Tornado Warning	MOB	Choctaw, Washington	30 min
Apr 11, 5:34 PM CDT	Tornado Warning	MOB	Clarke	41 min
Apr 11, 6:09 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw	27 min

Nearby

Flash Flood Warnings in Alabama, 2008 Every flash flood warning in 2008

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.