Alert archive / Alabama / Flash Flood Warnings in 2011

Flash Flood Warning 43, NWS Birmingham, AL

August 10, 2011Lamar County, Alabama

NWS Birmingham, AL issued this flash flood warning at Aug 10, 2011, 4:08 PM CDT for Lamar County, Alabama. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 10, 2011, 4:08 PM CDT (21:08 UTC)
Expired: Aug 10, 2011, 5:05 PM CDT
In force: 57 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

County Lamar County, AL

The radar

The Columbus AFB radar (KGWX), 30 km from the middle of the area, began a volume at 21:10 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, 9.1 hours before the alert went out and 138 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: 386 J/kg
Mixed-layer CIN: -103 J/kg
Mixed-layer LCL: 912 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

451 
WGUS54 KBMX 102108
FFWBMX
ALC075-110000-
/O.NEW.KBMX.FF.W.0043.110810T2108Z-110811T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
408 PM CDT WED AUG 10 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

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

* UNTIL 700 PM CDT

* AT 408 PM CDT...NATIONAL WEATHER SERVICE INDICATED SLOW MOVING   
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA WITHIN 
THE NEXT HOUR.  THESE STORMS COULD CAUSE FLOODING ACROSS THE 
AREA...ESPECIALLY IN AND AROUND THE CITY OF VERNON.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...     
  MILLPORT...VERNON AND KENNEDY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. RAINFALL FROM PERSISTENT RAINBANDS
WILL PRODUCE FLOODING IN LOW LYING AREAS AND ALONG STREETS. MANY
ROADS WILL BE CLOSED DUE TO HIGH WATER AND DRIVING IS NOT RECOMMENDED
DURING THE NEXT SEVERAL HOURS.

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 FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
BIRMINGHAM.

&&

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

LAT...LON 3379 8825 3379 8794 3353 8794 3354 8828

$$

27

1 follow-up statement

475 
WGUS74 KBMX 102205
FFSBMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
505 PM CDT WED AUG 10 2011

ALC075-102221-
/O.CAN.KBMX.FF.W.0043.000000T0000Z-110811T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LAMAR AL-
505 PM CDT WED AUG 10 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHERN LAMAR
COUNTY IS CANCELLED...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 3379 8825 3379 8794 3353 8794 3354 8828

$$

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 2:10 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Pickens	50 min
Aug 10, 3:10 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Hale, Perry	50 min
Aug 10, 3:17 PM CDT	Special Weather Statement	BMX	Hale	43 min
Aug 10, 3:33 PM CDT	Special Weather Statement	BMX	Bibb	42 min
Aug 10, 3:42 PM CDT	Severe Thunderstorm Warning	BMX	Perry	48 min
Aug 10, 3:52 PM CDT	Special Weather Statement	BMX	Lowndes	38 min
Aug 10, 4:12 PM CDT	Special Weather Statement	BMX	Dallas	48 min
Aug 10, 4:18 PM CDT	Special Weather Statement	BMX	Autauga	42 min
Aug 10, 4:23 PM CDT	Severe Thunderstorm Warning	BMX	Dallas	52 min
Aug 10, 4:34 PM CDT	Special Weather Statement	BMX	Lamar, Pickens	41 min
Aug 10, 4:40 PM CDT	Severe Thunderstorm Warning	BMX	Pickens	50 min
Aug 10, 5:02 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Pickens, Sumter	43 min
Aug 10, 5:21 PM CDT	Special Weather Statement	BMX	Montgomery	39 min
Aug 10, 5:43 PM CDT	Special Weather Statement	BMX	Greene	47 min
Aug 10, 6:20 PM CDT	Special Weather Statement	BMX	Sumter	40 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; radar from the NEXRAD Level II archive.