Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 272, NWS Birmingham, AL

August 10, 2012Bibb County, Tuscaloosa County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Aug 10, 2012, 5:36 PM CDT for Bibb County, Tuscaloosa County, Alabama. It was in force for 39 min. 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: Aug 10, 2012, 5:36 PM CDT (22:36 UTC)
Expired: Aug 10, 2012, 6:15 PM CDT
In force: 39 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Bibb County, AL, Tuscaloosa County, AL

The radar

The Birmingham radar (KBMX), 33 km from the middle of the area, began a volume at 22:39 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
Aug 10, 5:45 PM CDT	HAIL 0.75	3 Ne Coaling, AL	UP TO PENNY SIZE HAIL REPORTED AT EXIT 86 OFF INTERSTATE 20/59.
Aug 10, 6:00 PM CDT	HAIL 0.5	2 S Lake View, AL	DIME SIZE HAIL REPORTED ALONG INTERSTATE 20/59 NEAR EXIT 97. TIME ESTIMATED FROM RADAR.

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, 10.6 hours before the alert went out and 32 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: 99 J/kg
Mixed-layer CIN: -153 J/kg
Mixed-layer LCL: 615 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

181 
WUUS54 KBMX 102236
SVRBMX
ALC007-125-102315-
/O.NEW.KBMX.SV.W.0272.120810T2236Z-120810T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
536 PM CDT FRI AUG 10 2012

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN BIBB COUNTY IN ALABAMA...
  EAST CENTRAL TUSCALOOSA COUNTY IN WEST CENTRAL ALABAMA...

* UNTIL 615 PM CDT

* AT 536 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
  WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR COALING...
  OR 13 MILES SOUTHEAST OF HOLT...AND MOVING EAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BROOKWOOD...BEVILLE LOCK AND DAM...VANCE...ABERNANT...WOODSTOCK
  JUNCTION...WEST BLOCTON...TANNEHILL IRONWORKS STATE PARK AND LAKE
  VIEW.

THIS INCLUDES...
INTERSTATE 20 EXIT NUMBERS 79 THROUGH 100...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS.

&&

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

LAT...LON 3334 8719 3330 8715 3330 8713 3329 8712
      3328 8707 3325 8706 3324 8703 3317 8702
      3316 8697 3310 8697 3310 8695 3305 8738
      3324 8744
TIME...MOT...LOC 2236Z 256DEG 14KT 3316 8730

$$

56

1 follow-up statement

085 
WWUS54 KBMX 102250
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
550 PM CDT FRI AUG 10 2012

ALC007-125-102315-
/O.CON.KBMX.SV.W.0272.000000T0000Z-120810T2315Z/
BIBB AL-TUSCALOOSA AL-
550 PM CDT FRI AUG 10 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
TUSCALOOSA AND NORTHERN BIBB COUNTIES UNTIL 615 PM CDT...

AT 548 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
VANCE...OR 15 MILES NORTHWEST OF CENTREVILLE...MOVING EAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  VANCE...ABERNANT...WOODSTOCK JUNCTION...WEST BLOCTON...TANNEHILL
  IRONWORKS STATE PARK...LAKE VIEW...GREEN POND...CAFFEE JUNCTION...
  HEBRON AND BUCKSVILLE.

THIS INCLUDES...
INTERSTATE 20 EXIT NUMBERS 86 THROUGH 100...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

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

LAT...LON 3334 8719 3330 8715 3328 8707 3325 8706
      3324 8703 3317 8702 3316 8697 3310 8697
      3310 8695 3306 8732 3326 8737
TIME...MOT...LOC 2249Z 256DEG 14KT 3317 8724

$$

56

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 3:54 PM CDT	Special Weather Statement	BMX	Greene	36 min
Aug 10, 4:37 PM CDT	Special Weather Statement	BMX	Hale	23 min
Aug 10, 5:11 PM CDT	Special Weather Statement	BMX	Bibb	34 min
Aug 10, 5:30 PM CDT	Special Weather Statement	BMX	Bibb	30 min
Aug 10, 6:08 PM CDT	Special Weather Statement	BMX	Jefferson	52 min
Aug 10, 6:12 PM CDT	Special Weather Statement	BMX	Shelby	48 min
Aug 10, 6:47 PM CDT	Special Weather Statement	BMX	Chilton	43 min
Aug 10, 6:57 PM CDT	Special Weather Statement	BMX	Shelby	48 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2012 Every severe thunderstorm 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.