Alert archive / Alabama / Flash Flood Warnings in 2011

Flash Flood Warning 21, NWS Birmingham, AL

April 21, 2011Lamar County, Marion County, Pickens County, Alabama

NWS Birmingham, AL issued this flash flood warning at Apr 21, 2011, 12:30 AM CDT for Lamar County, Marion County, Pickens County, Alabama. It was in force for 3 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 21, 2011, 12:30 AM CDT (05:30 UTC)
Expired: Apr 21, 2011, 3:30 AM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

Counties Lamar County, AL, Marion County, AL, Pickens County, AL

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 5.5 hours before the alert went out and 125 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.

726 
WGUS54 KBMX 210530
FFWBMX
ALC075-093-107-210830-
/O.NEW.KBMX.FF.W.0021.110421T0530Z-110421T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1230 AM CDT THU APR 21 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

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

* UNTIL 330 AM CDT

* AT 1225 AM CDT...EMERGENCY MANAGEMENT REPORTED SEVERAL CREEKS AND 
STREAMS OUT OF THEIR BANKS IN LAMAR COUNTY. SOME ROADS ARE ALSO 
FLOODED. RAINFALL OVER THE PAST 6 HOURS OF SO WAS ESTIMATED BY RADAR 
BETWEEN 3 TO 4 INCHES. ADDITIONAL SHOWERS AND THUNDERSTORMS WILL 
OCCUR OVERNIGHT WITH THE POTENTIAL FOR RUNOFF AND FLOODING FOR 
SEVERAL MORE HOURS. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  ALICEVILLE...CARROLLTON...GORDO...HAMILTON...MILLPORT...
  PICKENSVILLE...REFORM...SULLIGENT...VERNON...WINFIELD...ASHCRAFT
  CORNER...BEAVERTON...BEDFORD...BENEVOLA...BLOOMING GROVE...
  BRILLIANT...BRINN...CREWS...DETROIT...ETHELSVILLE...GARDEN...
  GU-WIN...GUIN...HACKLEBURG...KENNEDY...LAKE BUTTAHATCHEE...LAMAR
  COUNTY AIRPORT...MCMULLEN...MEMPHIS AND WESTON.

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.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

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

LAT...LON 3432 8817 3431 8764 3391 8764 3392 8795
      3353 8794 3353 8784 3316 8784 3299 8824
      3299 8834

$$

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, 8:54 PM CDT	Flash Flood Warning	BMX	Lamar	3 hr
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, 12:40 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; the sounding from the Mesonet's radiosonde archive.