Alert archive / Alabama / Flash Flood Warnings in 2013

Flash Flood Warning 4, NWS Mobile, AL

February 12, 2013Choctaw County, Clarke County, Wilcox County, Alabama; Wayne County, Mississippi

NWS Mobile, AL issued this flash flood warning at Feb 12, 2013, 9:28 AM CST for Choctaw County, Clarke County, Wilcox County, Alabama; Wayne County, Mississippi. 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: Feb 12, 2013, 9:28 AM CST (15:28 UTC)
Expired: Feb 12, 2013, 3:15 PM CST
In force: 6 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

Counties Choctaw County, AL, Clarke County, AL, Wilcox County, AL, Wayne County, MS

The radar

The Mobile radar (KMOB), 157 km from the middle of the area, began a volume at 15:31 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, 3.5 hours before the alert went out and 167 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: 1446 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: -67 m²/s²
0-3 km storm-relative helicity: 91 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.

359 
WGUS54 KMOB 121528
FFWMOB
ALC023-025-131-MSC153-122115-
/O.NEW.KMOB.FF.W.0004.130212T1528Z-130212T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
928 AM CST TUE FEB 12 2013

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN WILCOX COUNTY IN SOUTH CENTRAL ALABAMA...
  NORTHERN WAYNE COUNTY IN SOUTHEAST MISSISSIPPI...
  CHOCTAW COUNTY IN SOUTHWEST ALABAMA...
  NORTHERN CLARKE COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 315 PM CST

* AT 925 AM CST...RADAR PRECIPITATION ESTIMATES INDICATE 1 TO 3
  INCHES OF ADDITIONAL RAINFALL HAS FALLEN SINCE 6 AM CST OVER
  PORTIONS OF THE WARNED AREA. ADDITIONAL SHOWERS AND THUNDERSTORMS
  MOVING IN FROM THE WEST COULD PRODUCE ANOTHER 1 TO 2 INCHES
  BEFORE EARLY AFTERNOON WITH ADDITIONAL RAINFALL LATER THIS
  AFTERNOON AS A SURFACE LOW DEVELOPS AND APPROACHES FROM THE SOUTH.

  THIS IS A SERIOUS SITUATION. CHOCTAW COUNTY EMERGENCY MANAGEMENT 
  ADVISES THAT NUMEROUS ROADS REMAIN CLOSED AND SEVERAL BRIDGES
  COULD BE BREACHED IF WATER LEVELS CONTINUE TO RISE.

  AREAL FLOOD WARNINGS REMAIN IN EFFECT ALSO FOR THIS AREA TO ADDRESS
  STEADILY RISING RIVER AND CREEK LEVELS AS WELL AS THE GENERAL
  INUNDATION OF LOW LYING AREAS.

* LOCATIONS IMPACTED INCLUDE...
  BOYKIN...             WAYNESBORO...         TOXEY...
  SILAS...              PENNINGTON...         NEEDHAM...
  LISMAN...             GILBERTOWN...         BUTLER...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3231 8793 3228 8794 3228 8801 3218 8800
      3208 8804 3205 8811 3200 8810 3199 8806
      3201 8763 3213 8763 3214 8753 3228 8750
      3228 8745 3205 8717 3185 8731 3170 8846
      3159 8895 3183 8894 3190 8848 3231 8842

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 11, 8:38 PM CST	Small Craft Advisory	MOB		9 hr
Feb 12, 6:01 AM CST	Areal Flood Warning	MOB	Choctaw, Clarke, Monroe, Washington, Wilcox	6 hr
Feb 12, 11:45 AM CST	Areal Flood Warning	MOB	Choctaw, Clarke, Monroe, Washington, Wilcox	24 hr
Feb 12, 1:35 PM CST	Areal Flood Advisory	MOB	Mobile	115 min
Feb 12, 3:02 PM CST	Wind Advisory	MOB		7 hr
Feb 12, 3:17 PM CST	Small Craft Advisory	MOB		24 hr

Nearby

Flash Flood Warnings in Alabama, 2013 Flash Flood Warnings in Mississippi, 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.