Alert archive / Alabama / Flash Flood Warnings in 2013

Flash Flood Warning 10, NWS Mobile, AL

April 11, 2013Clarke County, Alabama

NWS Mobile, AL issued this flash flood warning at Apr 11, 2013, 5:27 PM CDT for Clarke 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: Apr 11, 2013, 5:27 PM CDT (22:27 UTC)
Expired: Apr 11, 2013, 11:30 PM CDT
In force: 6 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Clarke County, AL

The radar

The Mobile radar (KMOB), 104 km from the middle of the area, began a volume at 22:30 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, 10.5 hours before the alert went out and 209 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: 35 J/kg
Mixed-layer CIN: -291 J/kg
Mixed-layer LCL: 635 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 169 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.

579 
WGUS54 KMOB 112227
FFWMOB
ALC025-120430-
/O.NEW.KMOB.FF.W.0010.130411T2227Z-130412T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
527 PM CDT THU APR 11 2013

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEST CENTRAL CLARKE COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 1130 PM CDT

* AT 525 PM CDT...EMERGENCY MANAGEMENT REPORTED FLOODING ACROSS
  HIGHWAY 69 IN CLARKE COUNTY. VERY HEAVY RAINFALL WAS INDICATED
  OVER THE WARNED AREA AND RADAR ESTIMATES SHOW 1 TO 2 INCHES OF
  RAINFALL HAS OCCURRED OVER THE PAST TWO HOURS.

* LOCATIONS IMPACTED INCLUDE...
  JACKSON...            GROVE HILL...

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!

&&

LAT...LON 3172 8775 3147 8789 3148 8791 3149 8791
      3153 8795 3153 8797 3155 8802 3157 8804
      3158 8802 3158 8805 3161 8808 3175 8809

$$

1 follow-up statement

510 
WGUS74 KMOB 120114
FFSMOB

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
814 PM CDT THU APR 11 2013

ALC025-120123-
/O.CAN.KMOB.FF.W.0010.000000T0000Z-130412T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARKE AL-
814 PM CDT THU APR 11 2013

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL CLARKE
COUNTY...

AT 810 PM CDT...THE HEAVY RAINFALL THAT PROMPTED THE WARNING FOR CENTRAL CLARKE 
COUNTY HAS MOVED OUT OF THE COUNTY...THUS THE FLASH FLOOD WARNING HAS BEEN 
CANCELLED. HOWEVER...PONDING OF WATER MAY STILL BE ENCOUNTERED.

LAT...LON 3172 8775 3147 8789 3148 8791 3149 8791
      3153 8795 3153 8797 3155 8802 3157 8804
      3158 8802 3158 8805 3161 8808 3175 8809

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 3:47 AM CDT	Rip Current Statement	MOB		20 hr
Apr 11, 3:49 AM CDT	Wind Advisory	MOB	Butler, Choctaw, Clarke, Conecuh, Covington, Crenshaw and 4 more	15 hr
Apr 11, 1:41 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw	64 min
Apr 11, 2:16 PM CDT	Tornado Warning	MOB	Choctaw	44 min
Apr 11, 2:18 PM CDT	Tornado Warning	MOB	Washington	42 min
Apr 11, 2:36 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke	39 min
Apr 11, 2:44 PM CDT	Severe Thunderstorm Warning	MOB	Washington	31 min
Apr 11, 4:06 PM CDT	Special Marine Warning	MOB		84 min
Apr 11, 5:21 PM CDT	Special Marine Warning	MOB		84 min
Apr 11, 5:27 PM CDT	Severe Thunderstorm Warning	MOB	Mobile	33 min
Apr 11, 5:43 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Mobile	32 min
Apr 11, 6:06 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Escambia	24 min
Apr 11, 6:32 PM CDT	Special Marine Warning	MOB		88 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.