Alert archive / Alabama / Flash Flood Warnings in 2012

Flash Flood Warning 13, NWS Birmingham, AL

June 11, 2012Shelby County, Talladega County, Alabama

NWS Birmingham, AL issued this flash flood warning at Jun 11, 2012, 8:18 PM CDT for Shelby County, Talladega 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: Jun 11, 2012, 8:18 PM CDT (01:18 UTC)
Expired: Jun 11, 2012, 11:30 PM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

Counties Shelby County, AL, Talladega County, AL

The radar

The Birmingham radar (KBMX), 39 km from the middle of the area, began a volume at 01:19 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
Jun 11, 9:00 PM CDT	FLASH FLOOD	Nne Harpersville, AL	FLASH FLOODING REPORTED ON HIGHWAY 25.

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, 1.3 hours before the alert went out and 40 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: 2695 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 779 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

401 
WGUS54 KBMX 120118
FFWBMX
ALC117-121-120430-
/O.NEW.KBMX.FF.W.0013.120612T0118Z-120612T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
818 PM CDT MON JUN 11 2012

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN SHELBY COUNTY IN ALABAMA...
  SOUTHWESTERN TALLADEGA COUNTY IN EAST CENTRAL ALABAMA...

* UNTIL 1130 PM CDT

* AT 817 PM CDT...THE PUBLIC REPORTED HEAVY RAINFALL WITH SLOW       
  MOVING THUNDERSTORMS ACROSS THE WARNED AREA.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CHELSEA...CHILDERSBURG...COLUMBIANA...SYLACAUGA...TALLADEGA
  SPRINGS...WILSONVILLE...ALPINE...FAYETTEVILLE...HARPERSVILLE...
  LOGAN MARTIN DAM...SYCAMORE...VINCENT...WESTOVER AND WINTERBORO.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXTREMELY DANGEROUS FLOODING IS OCCURRING. NUMEROUS ROADS...STREETS
AND HIGHWAYS ARE CLOSED DUE TO HIGH WATER. TRAVEL IS DISCOURAGED. DO
NOT ATTEMPT TO DRIVE UNTIL WEATHER AND TRAVEL CONDITIONS IMPROVE
LATER. CONDITIONS ARE LIFE THREATENING.

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 3319 8616 3319 8617 3311 8618 3310 8649
      3309 8651 3307 8670 3347 8661 3348 8660
      3345 8638 3339 8638 3344 8632 3341 8609

$$

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 7:17 PM CDT	Severe Thunderstorm Warning	BMX	Shelby, Talladega	43 min
Jun 11, 7:26 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Walker	64 min
Jun 11, 7:30 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Hale, Pickens, Sumter, Tuscaloosa	45 min
Jun 11, 7:51 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Walker	39 min
Jun 11, 7:56 PM CDT	Special Weather Statement	BMX	Shelby	49 min
Jun 11, 7:59 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Hale, Jefferson, Perry, Shelby and 1 more	46 min
Jun 11, 8:03 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Hale, Sumter	42 min
Jun 11, 8:06 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Jefferson, St. Clair, Shelby	54 min
Jun 11, 8:45 PM CDT	Special Weather Statement	BMX	Marengo	45 min
Jun 11, 8:53 PM CDT	Severe Thunderstorm Warning	BMX	Clay, Coosa, St. Clair, Shelby, Talladega	52 min
Jun 11, 8:54 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Chilton, Coosa, Dallas, Perry	51 min
Jun 11, 9:38 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Coosa, Elmore, Lowndes, Montgomery, Tallapoosa	52 min
Jun 11, 10:13 PM CDT	Special Weather Statement	BMX	Bullock, Lee, Macon, Montgomery	47 min
Jun 11, 10:54 PM CDT	Special Weather Statement	BMX	Barbour, Bullock, Lee, Pike, Russell	66 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.