Alert archive / Alabama / Flash Flood Warnings in 2013

Flash Flood Warning 40, NWS Mobile, AL

July 23, 2013Choctaw County, Alabama

NWS Mobile, AL issued this flash flood warning at Jul 23, 2013, 3:48 PM CDT for Choctaw County, Alabama. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 23, 2013, 3:48 PM CDT (20:48 UTC)
Expired: Jul 23, 2013, 9:45 PM CDT
In force: 6 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Choctaw County, AL

The radar

The Mobile radar (KMOB), 165 km from the middle of the area, began a volume at 20:51 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

Birmingham, AL (KBMX), launched 12:00Z, 8.8 hours before the alert went out and 166 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: 1182 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 535 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 42 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.8

Open this sounding in Storm Lab

The text

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

101 
WGUS54 KMOB 232048
FFWMOB
ALC023-240245-
/O.NEW.KMOB.FF.W.0040.130723T2048Z-130724T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
348 PM CDT TUE JUL 23 2013

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 945 PM CDT

* AT 343 PM CDT...VERY HEAVY RAINFALL WAS INDICATED OVER THE WARNED
  AREA AND RADAR ESTIMATES SHOW 1 TO 2 INCHES OF RAINFALL HAS
  OCCURRED OVER THE PAST HOUR WHICH HAS FALLEN ON SATURATED GROUND.
  THIS WILL LIKELY CAUSE FLASH FLOODING IN THE WARNED AREA.

* LOCATIONS IMPACTED INCLUDE...
  PENNINGTON...         NEEDHAM...            LISMAN...
  BUTLER...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS FLOODING IS IMMINENT OR OCCURRING. SEEK
HIGHER GROUND IMMEDIATELY. DO NOT DRIVE OR WALK INTO AREAS WHERE
WATER CROSSES A ROAD. TURN AROUND - DON'T DROWN!

NEVER TRY TO CROSS OR PLAY IN AN URBAN SPILLWAY OR FLOWING CREEK...
EVEN A SMALL ONE. URBAN FLASH FLOODING IS A MAJOR KILLER.

&&

LAT...LON 3228 8793 3230 8795 3230 8798 3228 8801
      3215 8801 3214 8804 3208 8804 3206 8807
      3205 8811 3201 8811 3200 8807 3198 8807
      3195 8847 3231 8842 3231 8792

$$

1 follow-up statement

666 
WGUS74 KMOB 232359
FFSMOB

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
659 PM CDT TUE JUL 23 2013

ALC023-240009-
/O.CAN.KMOB.FF.W.0040.000000T0000Z-130724T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHOCTAW AL-
659 PM CDT TUE JUL 23 2013

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHERN CHOCTAW
COUNTY...

AT 657 PM CDT...THE HEAVY RAINFALL THAT PROMPTED THE WARNING FOR
NORTHERN CHOCTAW COUNTY HAS ENDED...THUS THE FLASH FLOOD WARNING HAS
BEEN CANCELLED. HOWEVER...PONDING OF WATER MAY STILL BE ENCOUNTERED.

LAT...LON 3228 8793 3230 8795 3230 8798 3228 8801
      3215 8801 3214 8804 3208 8804 3206 8807
      3205 8811 3201 8811 3200 8807 3198 8807
      3195 8847 3231 8842 3231 8792

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 7:36 PM CDT	Special Marine Warning	MOB		84 min
Jul 22, 8:14 PM CDT	Special Marine Warning	MOB		91 min
Jul 23, 2:38 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Wilcox	67 min
Jul 23, 3:05 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Monroe, Washington, Wilcox	40 min
Jul 23, 3:09 PM CDT	Areal Flood Advisory	MOB	Choctaw	2 hr
Jul 23, 3:18 PM CDT	Areal Flood Advisory	MOB	Wilcox	117 min
Jul 23, 3:45 PM CDT	Flash Flood Warning	MOB	Clarke	3 hr
Jul 23, 3:45 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Choctaw, Clarke, Conecuh, Monroe, Washington and 1 more	60 min
Jul 23, 4:11 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Conecuh, Covington, Crenshaw	49 min
Jul 23, 4:22 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 3 more	53 min
Jul 23, 4:48 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Clarke, Conecuh, Covington, Escambia, Mobile and 2 more	42 min
Jul 23, 4:57 PM CDT	Areal Flood Advisory	MOB	Wilcox	2 hr
Jul 23, 5:35 PM CDT	Special Marine Warning	MOB		85 min
Jul 23, 5:46 PM CDT	Special Marine Warning	MOB		74 min
Jul 23, 6:20 PM CDT	Special Marine Warning	MOB		115 min
Jul 23, 6:58 PM CDT	Special Marine Warning	MOB		47 min

Nearby

Flash Flood Warnings in Alabama, 2013 Every flash flood warning in 2013

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.