Alert archive / Alabama / Flash Flood Warnings in 2012

Flash Flood Warning 30, NWS Birmingham, AL

August 13, 2012Lamar County, Alabama

NWS Birmingham, AL issued this flash flood warning at Aug 13, 2012, 9:06 PM CDT for Lamar 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: Aug 13, 2012, 9:06 PM CDT (02:06 UTC)
Expired: Aug 14, 2012, 12:00 AM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

County Lamar County, AL

The radar

The Columbus AFB radar (KGWX), 21 km from the middle of the area, began a volume at 02:09 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
Aug 13, 9:45 PM CDT	FLASH FLOOD	2 Ne Sulligent, AL	6 INCHES OF FLOWING WATER COVERING HIGHWAY 278. FLOOWING WATER ALSO COVERING U.S. HIGHWAY 18 IN VERNON.

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 00:00Z, 2.1 hours before the alert went out and 143 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: 40 J/kg
Mixed-layer CIN: -209 J/kg
Mixed-layer LCL: 1237 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 195 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

339 
WGUS54 KBMX 140206
FFWBMX
ALC075-140500-
/O.NEW.KBMX.FF.W.0030.120814T0206Z-120814T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
906 PM CDT MON AUG 13 2012

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  LAMAR COUNTY IN WEST CENTRAL ALABAMA...

* UNTIL MIDNIGHT CDT

* AT 905 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED SHOWERS 
AND THUNDERSTORMS OVER LAMAR COUNTY THAT COULD DROP 1 TO 3 INCHES 
OVER THE NEXT COUPLE OF HOURS.  THIS WILL CAUSE FLOODING ESPECIALLY 
IN AND AROUND THE CITIES OF VERNON AND SULLIGENT.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  SULLIGENT...VERNON...BEAVERTON...BEDFORD...BLOOMING GROVE...       
  CREWS...KENNEDY AND LAMAR COUNTY AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

&&

TO REPORT SEVERE WEATHER...
CALL 1-800-856-0758 OR TWEET YOUR REPORT USING HASHTAG ALWX

LAT...LON 3399 8822 3398 8795 3357 8795 3358 8827

$$

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 9:47 PM CDT	Special Weather Statement	BMX	Winston	43 min
Aug 13, 10:19 PM CDT	Special Weather Statement	BMX	Fayette	41 min
Aug 13, 11:04 PM CDT	Special Weather Statement	BMX	Fayette	56 min
Aug 14, 12:29 AM CDT	Special Weather Statement	BMX	Shelby	46 min
Aug 14, 1:02 AM CDT	Special Weather Statement	BMX	Etowah, St. Clair	43 min
Aug 14, 1:11 AM CDT	Special Weather Statement	BMX	Shelby	49 min
Aug 14, 1:38 AM CDT	Special Weather Statement	BMX	Cherokee	52 min
Aug 14, 1:51 AM CDT	Special Weather Statement	BMX	Bibb	39 min
Aug 14, 2:17 AM CDT	Special Weather Statement	BMX	Calhoun, Cleburne	43 min
Aug 14, 2:33 AM CDT	Special Weather Statement	BMX	Winston	42 min
Aug 14, 7:35 AM CDT	Special Weather Statement	BMX	Lee	25 min
Aug 14, 1:07 PM CDT	Special Weather Statement	BMX	Pike	23 min
Aug 14, 1:23 PM CDT	Special Weather Statement	BMX	Montgomery	37 min
Aug 14, 1:38 PM CDT	Special Weather Statement	BMX	Pike	37 min
Aug 14, 1:57 PM CDT	Special Weather Statement	BMX	Barbour, Pike	48 min
Aug 14, 2:12 PM CDT	Special Weather Statement	BMX	Bullock	33 min
Aug 14, 3:00 PM CDT	Special Weather Statement	BMX	Barbour	30 min
Aug 14, 3:03 PM CDT	Special Weather Statement	BMX	Russell	42 min
Aug 14, 3:34 PM CDT	Areal Flood Advisory	BMX	Barbour	116 min
Aug 14, 3:36 PM CDT	Special Weather Statement	BMX	Barbour	24 min

Nearby

Flash Flood Warnings in Alabama, 2012 Every flash flood warning in 2012

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.