Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 171, NWS Birmingham, AL

June 11, 20127 counties in Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jun 11, 2012, 7:59 PM CDT for 7 counties in Alabama. It was in force for 46 min. 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, 7:59 PM CDT (00:59 UTC)
Expired: Jun 11, 2012, 8:45 PM CDT
In force: 46 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Bibb County, AL, Chilton County, AL, Hale County, AL, Jefferson County, AL, Perry County, AL, Shelby County, AL, Tuscaloosa County, AL

The radar

The Birmingham radar (KBMX), 69 km from the middle of the area, began a volume at 01:01 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, 8:03 PM CDT	TSTM WND DMG	1 Ese Woodstock Junctio, AL	NUMEROUS TREES DOWN ACROSS THE COUNTY WITH SOME ROADS BLOCKED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 11, 5:17 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 1.0 hours before the alert went out and 68 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.

689 
WUUS54 KBMX 120059
SVRBMX
ALC007-021-065-073-105-117-125-120145-
/O.NEW.KBMX.SV.W.0171.120612T0059Z-120612T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
759 PM CDT MON JUN 11 2012

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BIBB COUNTY IN ALABAMA...
  NORTHWESTERN CHILTON COUNTY IN ALABAMA...
  NORTHEASTERN HALE COUNTY IN WEST CENTRAL ALABAMA...
  SOUTHWESTERN JEFFERSON COUNTY IN ALABAMA...
  NORTHERN PERRY COUNTY IN ALABAMA...
  SOUTHWESTERN SHELBY COUNTY IN ALABAMA...
  SOUTHERN TUSCALOOSA COUNTY IN WEST CENTRAL ALABAMA...

* UNTIL 845 PM CDT

* AT 756 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A LINE OF
  SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
  NORTH JOHNS TO COALING TO MOUNDVILLE...AND MOVING SOUTHEAST AT 40
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  CENTREVILLE...BRENT...GREENSBORO...MONTEVALLO...CALERA...JEMISON...
  MARION AND VANCE.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBER 228...
INTERSTATE 20 EXIT NUMBERS 62 THROUGH 100...

WINDS OF 60 TO 70 MPH WILL BREAK LARGE TREE LIMBS AND CAUSE SOME
DAMAGE...ESPECIALLY TO SMALLER STRUCTURES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS HAVE A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE 
ACROSS TUSCALOOSA COUNTY. THIS IS AN EXTREMELY DANGEROUS SITUATION. 
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM 
WINDOWS.

INTENSE SQUALL LINES CAN OCCASIONALLY PRODUCE BRIEF TORNADOES IN
ADDITION TO WIDESPREAD SIGNIFICANT WIND DAMAGE. ALTHOUGH NOT
IMMEDIATELY LIKELY...FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON
THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. THIS STORM HAS THE
POTENTIAL TO CAUSE SERIOUS INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

&&

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

LAT...LON 3324 8751 3340 8723 3307 8664 3272 8692
      3269 8701 3272 8702 3269 8704 3257 8752
      3290 8778 3291 8776 3293 8778 3294 8773
      3298 8775 3299 8771 3302 8771 3302 8784
      3311 8784
TIME...MOT...LOC 0058Z 316DEG 37KT 3331 8705 3311 8736
          3297 8769

$$

27

1 follow-up statement

010 
WWUS54 KBMX 120126
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
826 PM CDT MON JUN 11 2012

ALC073-120134-
/O.CAN.KBMX.SV.W.0171.000000T0000Z-120612T0145Z/
JEFFERSON AL-
826 PM CDT MON JUN 11 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN JEFFERSON COUNTY
IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF 
SOUTHWESTERN JEFFERSON COUNTY.  A WARNING IS STILL IN EFFECT FOR 
EASTERN PORTIONS OF THE COUNTY.

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

LAT...LON 3303 8738 3327 8709 3325 8706 3320 8693
      3307 8664 3272 8692 3269 8701 3272 8702
      3269 8705 3257 8750 3259 8753 3290 8778
TIME...MOT...LOC 0124Z 316DEG 37KT 3312 8683 3292 8714
          3278 8747

$$

ALC007-021-065-105-117-125-120145-
/O.CON.KBMX.SV.W.0171.000000T0000Z-120612T0145Z/
BIBB AL-CHILTON AL-HALE AL-PERRY AL-SHELBY AL-TUSCALOOSA AL-
826 PM CDT MON JUN 11 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
TUSCALOOSA...SOUTHWESTERN SHELBY...NORTHERN PERRY...NORTHEASTERN
HALE...NORTHWESTERN CHILTON AND BIBB COUNTIES UNTIL 845 PM CDT...

AT 820 PM CDT...A THUNDERSTORM WITH DAMAGING WINDS IN EXCESS OF 60 
MPH CONTINUES TO MOVE SOUTHWARD.  THESE STORMS WERE LOCATED ALONG A 
LINE EXTENDING FROM AMERICAN VILLAGE TO BRENT TO 9 MILES NORTHEAST 
OF GREENSBORO...MOVING SOUTHEAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  CALERA...JEMISON...MARION...ASHBY...HEIBERGER...TALLADEGA NATIONAL
  FOREST...LAWLEY...CHILTON COUNTY MOTOR SPORTS PARK...MAPLESVILLE
  AND ELLARDS.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBER 228...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE ACROSS 
TUSCALOOSA COUNTY. THIS IS AN EXTREMELY DANGEROUS SITUATION. SEEK 
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

INTENSE SQUALL LINES CAN OCCASIONALLY PRODUCE BRIEF TORNADOES IN
ADDITION TO WIDESPREAD SIGNIFICANT WIND DAMAGE. ALTHOUGH NOT
IMMEDIATELY LIKELY...FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON
THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. THIS STORM HAS THE
POTENTIAL TO CAUSE SERIOUS INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

&&

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

LAT...LON 3303 8738 3327 8709 3325 8706 3320 8693
      3307 8664 3272 8692 3269 8701 3272 8702
      3269 8705 3257 8750 3259 8753 3290 8778
TIME...MOT...LOC 0124Z 316DEG 37KT 3312 8683 3292 8714
          3278 8747

$$

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, 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, 8:18 PM CDT	Flash Flood Warning	BMX	Shelby, Talladega	3 hr
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

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.