Alert archive / Alabama / Flash Flood Warnings in 2011

Flash Flood Warning 18, NWS Birmingham, AL

April 20, 2011Lamar County, Alabama

NWS Birmingham, AL issued this flash flood warning at Apr 20, 2011, 8:54 PM CDT for Lamar County, Alabama. It was in force for 3 hr. 2 reports 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: Apr 20, 2011, 8:54 PM CDT (01:54 UTC)
Expired: Apr 21, 2011, 12:00 AM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

County Lamar County, AL

What was reported inside it

Time	Report	Where	Remark
Apr 20, 9:49 PM CDT	FLASH FLOOD	Sulligent, AL	FLOODING IN SULLIGENT ALONG HIGHWAY 278.
Apr 20, 9:49 PM CDT	FLASH FLOOD	Vernon, AL	FLOODING IN VERNON...SEVERAL ROADS IMPASSABLE.

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, 1.9 hours before the alert went out and 147 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: 1060 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 1220 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

361 
WGUS54 KBMX 210154
FFWBMX
ALC075-210500-
/O.NEW.KBMX.FF.W.0018.110421T0154Z-110421T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
854 PM CDT WED APR 20 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

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

* UNTIL MIDNIGHT CDT

* AT 852 PM CDT...NATIONAL WEATHER SERVICE INDICATED NUMEROUS   
THUNDERSTORMS WITH VERY HEAVY RAINFALL THAT WILL BE MOVING INTO 
LAMAR COUNTY FROM THE WEST. SOME AREAS COULD RECEIVE 1 TO 2 INCHES 
OF RAIN IN A SHORT PERIOD OF TIME. SEVERAL LOCAL CREEKS AND STREAMSS 
ARE ALREADY AT BANKFULL. THIS ADDITIONAL RAIN WILL PRODUCE FLOODING.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.

&&

TO REPORT SEVERE WEATHER...
CALL 1-800-856-0758.

LAT...LON 3405 8821 3406 8820 3406 8799 3403 8798
      3402 8795 3353 8794 3354 8828

$$

75

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 7:10 PM CDT	Special Weather Statement	BMX	Marion	50 min
Apr 20, 8:06 PM CDT	Severe Thunderstorm Warning	BMX	Lamar	39 min
Apr 20, 8:44 PM CDT	Severe Thunderstorm Warning	BMX	Lamar, Marion	46 min
Apr 20, 9:08 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Lamar, Marion, Pickens, Winston	52 min
Apr 20, 9:36 PM CDT	Flash Flood Warning	BMX	Fayette, Lamar, Marion, Pickens, Winston	3 hr
Apr 20, 9:54 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Lamar, Marion, Pickens, Tuscaloosa, Walker and 1 more	66 min
Apr 20, 10:12 PM CDT	Flash Flood Warning	BMX	Fayette, Pickens, Tuscaloosa, Walker, Winston	3 hr
Apr 20, 10:13 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Pickens, Sumter, Tuscaloosa	47 min
Apr 20, 10:36 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Blount, Jefferson, Tuscaloosa, Walker	54 min
Apr 20, 10:40 PM CDT	Areal Flood Advisory	BMX	Blount, Greene, Jefferson, Pickens, Sumter, Tuscaloosa and 1 more	3 hr
Apr 20, 11:26 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Etowah, Jefferson, St. Clair, Talladega	49 min
Apr 20, 11:52 PM CDT	Areal Flood Advisory	BMX	Calhoun, Cherokee, Cleburne, Etowah, St. Clair, Talladega	3 hr
Apr 20, 11:58 PM CDT	Special Weather Statement	BMX	Calhoun, Cherokee, Cleburne, Etowah	62 min
Apr 21, 12:12 AM CDT	Special Weather Statement	BMX	Chambers, Clay, Coosa, Randolph	63 min
Apr 21, 12:30 AM CDT	Flash Flood Warning	BMX	Lamar, Marion, Pickens	3 hr
Apr 21, 12:40 AM CDT	Severe Thunderstorm Warning	BMX	Cleburne	28 min
Apr 21, 12:50 AM CDT	Special Weather Statement	BMX	Pickens	40 min
Apr 21, 3:03 AM CDT	Special Weather Statement	BMX	Greene, Sumter	42 min
Apr 21, 7:36 AM CDT	River Flood Warning	BMX	Greene, Hale, Marengo, Pickens, Sumter	65 hr
Apr 21, 8:08 AM CDT	Areal Flood Warning	BMX	Lamar	36 hr
Apr 21, 9:23 AM CDT	River Flood Warning	BMX	Greene, Hale, Marengo	5 days
Apr 21, 2:09 PM CDT	Severe Thunderstorm Warning	BMX	Sumter	36 min
Apr 21, 2:43 PM CDT	Special Weather Statement	BMX	Greene, Sumter	32 min
Apr 21, 3:24 PM CDT	Special Weather Statement	BMX	Greene	51 min
Apr 21, 6:13 PM CDT	Special Weather Statement	BMX	Chilton	47 min

Nearby

Flash Flood Warnings in Alabama, 2011 Every flash flood warning in 2011

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.