Alert archive / Alabama / Flash Flood Warnings in 2011

Flash Flood Warning 24, NWS Birmingham, AL

June 25, 2011Jefferson County, Shelby County, Alabama

NWS Birmingham, AL issued this flash flood warning at Jun 25, 2011, 6:33 PM CDT for Jefferson County, Shelby 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 25, 2011, 6:33 PM CDT (23:33 UTC)
Expired: Jun 25, 2011, 9:30 PM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

Counties Jefferson County, AL, Shelby County, AL

The radar

The Birmingham radar (KBMX), 22 km from the middle of the area, began a volume at 23:35 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 25, 7:00 PM CDT	FLASH FLOOD	Riverchase, AL	HWY 119 AT THE INTERSECTION WITH INTERSTATE 65 FLOODED AND 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 12:00Z, 11.6 hours before the alert went out and 21 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: 536 J/kg
Mixed-layer CIN: -157 J/kg
Mixed-layer LCL: 1207 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

384 
WGUS54 KBMX 252333
FFWBMX
ALC073-117-260230-
/O.NEW.KBMX.FF.W.0024.110625T2333Z-110626T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
633 PM CDT SAT JUN 25 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL SHELBY COUNTY IN ALABAMA...
  SOUTH CENTRAL JEFFERSON COUNTY IN ALABAMA...

* UNTIL 930 PM CDT

* AT 633 PM CDT...THE PUBLIC REPORTED SLOW MOVING THUNDERSTORMS 
WITH   VERY HEAVY RAINFALL ACROSS THE WARNED AREA. 2 TO 3 INCHES 
HAVE FALLEN OVER THE LAST 30 MINUTES.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  HELENA...HOOVER...PELHAM...VESTAVIA HILLS...BLUFF PARK...INDIAN
  SPRINGS VILLAGE...OAK MOUNTAIN STATE PARK...REGIONS PARK OR HOOVER
  MET...RIVERCHASE...RIVERCHASE GALLERIA...ROSS BRIDGE AND VERIZON
  MUSIC CENTER AT OAK MOUNTAIN.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3345 8675 3332 8667 3324 8686 3338 8693

$$

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 7:07 PM CDT	Special Weather Statement	BMX	Autauga, Chambers, Elmore, Lee, Lowndes, Macon and 2 more	38 min
Jun 24, 7:11 PM CDT	Severe Thunderstorm Warning	BMX	Marengo, Sumter	34 min
Jun 24, 7:39 PM CDT	Special Weather Statement	BMX	Marengo	51 min
Jun 25, 4:35 AM CDT	Dense Fog Advisory	BMX	Blount, Calhoun, Cherokee, Clay, Cleburne, Etowah and 3 more	3 hr
Jun 25, 5:15 PM CDT	Special Weather Statement	BMX	Shelby	30 min
Jun 25, 5:32 PM CDT	Special Weather Statement	BMX	Shelby	28 min
Jun 25, 5:53 PM CDT	Areal Flood Advisory	BMX	Jefferson	3 hr
Jun 25, 5:56 PM CDT	Special Weather Statement	BMX	Shelby	34 min
Jun 25, 5:59 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Shelby	31 min
Jun 25, 6:25 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Shelby	50 min
Jun 25, 6:31 PM CDT	Special Weather Statement	BMX	Tuscaloosa	44 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; radar from the NEXRAD Level II archive.