Alert archive / Alabama / Flash Flood Warnings in 2013

Flash Flood Warning 39, NWS Mobile, AL

July 23, 2013Clarke County, Alabama

NWS Mobile, AL issued this flash flood warning at Jul 23, 2013, 3:45 PM CDT for Clarke 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: Jul 23, 2013, 3:45 PM CDT (20:45 UTC)
Expired: Jul 23, 2013, 6:45 PM CDT
In force: 3 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Clarke County, AL

The radar

The Mobile radar (KMOB), 141 km from the middle of the area, began a volume at 20:47 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

Time	Report	Where	Remark
Jul 23, 3:48 PM CDT	FLASH FLOOD	Thomasville, AL	EM REPORTS 5 TO 6 INCHES OF WATER OVER BASHI RD. IN THOMASVILLE.

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

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 8.8 hours before the alert went out and 177 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.

884 
WGUS54 KMOB 232045
FFWMOB
ALC025-232345-
/O.NEW.KMOB.FF.W.0039.130723T2045Z-130723T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 645 PM CDT

* AT 339 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...
  THOMASVILLE...

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 3188 8767 3187 8762 3183 8762 3184 8813
      3190 8813 3193 8805 3194 8807 3192 8809
      3195 8812 3196 8810 3195 8808 3199 8807
      3200 8767

$$

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	Severe Thunderstorm Warning	MOB	Butler, Choctaw, Clarke, Conecuh, Monroe, Washington and 1 more	60 min
Jul 23, 3:48 PM CDT	Flash Flood Warning	MOB	Choctaw	6 hr
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.