Alert archive / Alabama / Flash Flood Warnings in 2009

Flash Flood Warning 33, NWS Mobile, AL

May 7, 2009Choctaw County, Alabama

NWS Mobile, AL issued this flash flood warning at May 7, 2009, 8:47 PM CDT for Choctaw County, Alabama. It was in force for 3 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
May 7, 2009, 8:47 PM CDT (01:47 UTC)
Expired
May 8, 2009, 12:15 AM CDT
In force
3 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

County Choctaw County, AL

The radar

The Mobile radar (KMOB), 129 km from the middle of the area, began a volume at 01:49 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

TimeReportWhereRemark
May 7, 10:00 PM CDTFLASH FLOODSilas, ALNUMEROUS ROADS AND SEVERAL HOMES FLOODED IN SOUTHERN CHOCTAW COUNTY

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 1.8 hours before the alert went out and 187 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-pSkew-T log-p diagram, Jackson, MS at 00:00Z on 2009-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1769 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 00:00Z on 2009-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1769 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
1309 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.9

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KMOB 080147
FFWMOB
ALC023-080345-
/O.NEW.KMOB.FF.W.0033.090508T0147Z-090508T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
847 PM CDT THU MAY 7 2009

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 1045 PM CDT

* AT 844 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING FROM THUNDERSTORMS OVER THE WARNED AREA. DOPPLER    
  RADAR INDICATED 3 TO 5 INCHES OF RAIN HAS FALLEN ACROSS THE WARNED 
  AREA. ADDITIONAL THUNDERSTORMS CONTINUE TO DEVELOP AND MOVE ACROSS 
  THE SAME AREAS. THIS COULD LEAD TO ADDITIONAL RAINFALL AMOUNTS OF  
  1 TO 3 INCHES.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WOMACK
  HILL...WIMBLY...WATER VALLEY...TOXEY...SERVICE...PARAGON...LOU...
  HODGEWOOD...GILBERTOWN...CHAPPELL HILL AND BARRYTOWN

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

LAT...LON 3194 8811 3191 8811 3190 8813 3187 8813
      3186 8816 3182 8818 3176 8815 3176 8811
      3176 8810 3171 8809 3171 8846 3196 8844

$$
1 follow-up statement
000 
WGUS54 KMOB 080323
FFWMOB
ALC023-080515-
/O.EXT.KMOB.FF.W.0033.000000T0000Z-090508T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1023 PM CDT THU MAY 7 2009

THE NATIONAL WEATHER SERVICE IN MOBILE HAS EXTENDED THE

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

* UNTIL 1215 AM CDT

* AT 1013 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR ALONG WITH 
  EMERGENCY MANAGEMENT REPORTS CONTINUED TO INDICATE FLASH FLOODING     
  FROM THUNDERSTORMS ACROSS SOUTHERN CHOCTAW COUNTY. EMERGENCY       
  MANAGEMENT REPORTED 6 INCHES OF RAIN HAS FALLEN IN PORTIONS OF     
  SOUTHERN CHOCTAW COUNTY WHILE DOPPLER RADAR ESTIMATES AS MUCH AS 9 
  INCHES HAS FALLEN ACROSS PORTIONS OF THE WARNED AREA. NUMEROUS     
  ROADS HAVE BEEN CLOSED AND SEVERAL HOMES HAVE BEEN FLOODED.        
  AN ADDITIONAL 1 TO 2 INCHES IS POSSIBLE BEFORE THE                 
  THUNDERSTORMS DISSIPATE. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WOMACK
  HILL...WIMBLY...WATER VALLEY...TOXEY...PARAGON...LOU...HODGEWOOD...
  GILBERTOWN...CHAPPELL HILL AND BARRYTOWN

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

LAT...LON 3194 8811 3191 8811 3190 8813 3187 8813
      3186 8816 3182 8818 3176 8815 3176 8811
      3176 8810 3171 8809 3171 8846 3196 8844

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 7, 8:19 PM CDTAreal Flood AdvisoryMOBChoctaw, Clarke, Washington, Wilcox56 min

Nearby

Flash Flood Warnings in Alabama, 2009Every flash flood warning in 2009

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.