Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 313, NWS Birmingham, AL

December 25, 20125 counties in Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Dec 25, 2012, 7:38 PM CST for 5 counties in Alabama. It was in force for 41 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: Dec 25, 2012, 7:38 PM CST (01:38 UTC)
Expired: Dec 25, 2012, 8:19 PM CST
In force: 41 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Autauga County, AL, Chilton County, AL, Clay County, AL, Coosa County, AL, Talladega County, AL

The radar

The Birmingham radar (KBMX), 36 km from the middle of the area, began a volume at 01:41 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
Dec 25, 7:58 PM CST	TSTM WND DMG	3 S Alpine, AL	POWER LINES WERE BLOWN DOWN IN THE ALPINE COMMUNITY.
Dec 25, 8:09 PM CST	TSTM WND DMG	Weogufka, AL	A FEW TREES WERE BLOWN DOWN IN NORTHERN COOSA COUNTY AROUND WEOGUFKA.

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
Dec 25, 12:58 PM CST	Tornado Watch PDS	SPC	9 hr
Dec 25, 4:38 PM CST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 1.6 hours before the alert went out and 37 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: 22 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 563 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 696 m²/s²
0-3 km storm-relative helicity: 921 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

144 
WUUS54 KBMX 260138
SVRBMX
ALC001-021-027-037-121-260245-
/O.NEW.KBMX.SV.W.0313.121226T0138Z-121226T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
738 PM CST TUE DEC 25 2012

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN AUTAUGA COUNTY IN ALABAMA...
  CHILTON COUNTY IN ALABAMA...
  SOUTHWESTERN CLAY COUNTY IN EAST CENTRAL ALABAMA...
  COOSA COUNTY IN EAST CENTRAL ALABAMA...
  SOUTHERN TALLADEGA COUNTY IN EAST CENTRAL ALABAMA...

* UNTIL 845 PM CST

* AT 738 PM CST...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
  WILSONVILLE TO LAY LAKE DAM TO PARNELL...AND MOVING EAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  TALLADEGA SPRINGS...CLANTON...CHILDERSBURG...WEOGUFKA...
  SYLACAUGA...STEWARTVILLE...ROCKFORD AND GOODWATER.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 193 THROUGH 212...

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CST TUESDAY EVENING
FOR SOUTHEASTERN ALABAMA.

TO REPORT SEVERE WEATHER...
CALL 1-800-856-0758 OR TWEET YOUR REPORT USING HASHTAG ALWX

LAT...LON 3275 8622 3277 8633 3275 8641 3259 8642
      3257 8690 3266 8692 3267 8696 3298 8662
      3305 8660 3302 8656 3303 8652 3309 8651
      3312 8646 3318 8651 3320 8646 3328 8644
      3329 8637 3332 8636 3333 8601 3298 8601
TIME...MOT...LOC 0138Z 268DEG 31KT 3328 8643 3299 8650
          3264 8688

$$

27

2 follow-up statements

101 
WWUS54 KBMX 260201
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
801 PM CST TUE DEC 25 2012

ALC001-021-027-037-121-260245-
/O.CON.KBMX.SV.W.0313.000000T0000Z-121226T0245Z/
CHILTON AL-CLAY AL-COOSA AL-TALLADEGA AL-AUTAUGA AL-
801 PM CST TUE DEC 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
AUTAUGA...SOUTHERN TALLADEGA...COOSA...SOUTHWESTERN CLAY AND EAST
CENTRAL CHILTON COUNTIES UNTIL 845 PM CST...

AT 758 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR 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 SYCAMORE TO WEOGUFKA TO BILLINGSLEY...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  STEWARTVILLE...ROCKFORD...GOODWATER...KELLYTON...SYCAMORE...
  VERBENA...LYLE...BENTLEYVILLE...HANOVER AND WOODSTOCK.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 193 THROUGH 205...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

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

LAT...LON 3298 8601 3275 8622 3277 8633 3275 8641
      3259 8642 3258 8677 3296 8644 3308 8636
      3330 8628 3333 8601
TIME...MOT...LOC 0201Z 268DEG 30KT 3328 8622 3299 8629
          3264 8667

$$

27

442 
WWUS54 KBMX 260219
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
819 PM CST TUE DEC 25 2012

ALC001-021-027-037-121-260230-
/O.CAN.KBMX.SV.W.0313.000000T0000Z-121226T0245Z/
CHILTON AL-CLAY AL-COOSA AL-TALLADEGA AL-AUTAUGA AL-
819 PM CST TUE DEC 25 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN AUTAUGA...SOUTHERN
TALLADEGA...COOSA...SOUTHWESTERN CLAY AND EAST CENTRAL CHILTON
COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY.

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

LAT...LON 3298 8601 3275 8622 3277 8633 3275 8641
      3259 8642 3258 8677 3296 8644 3308 8636
      3330 8628 3333 8601
TIME...MOT...LOC 0220Z 268DEG 30KT 3328 8603 3299 8610
          3265 8648

$$

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 25, 6:10 PM CST	Severe Thunderstorm Warning	BMX	Dallas, Marengo, Perry	37 min
Dec 25, 6:15 PM CST	Severe Thunderstorm Warning	BMX	Chilton, Hale, Perry	45 min
Dec 25, 6:33 PM CST	Special Weather Statement	BMX	Bibb, Chilton, Jefferson, Shelby	57 min
Dec 25, 6:40 PM CST	Special Weather Statement	BMX	Pike	35 min
Dec 25, 6:44 PM CST	Tornado Warning	BMX	Barbour, Bullock, Pike	46 min
Dec 25, 6:45 PM CST	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Perry, Shelby	30 min
Dec 25, 7:00 PM CST	Areal Flood Advisory	BMX	Bibb, Chilton, Dallas, Jefferson, Perry, Shelby	3 hr
Dec 25, 7:08 PM CST	Severe Thunderstorm Warning	BMX	Autauga, Bibb, Chilton, Dallas, Perry, Shelby	52 min
Dec 25, 7:31 PM CST	Severe Thunderstorm Warning	BMX	Dallas, Lowndes	59 min
Dec 25, 7:34 PM CST	River Flood Warning	BMX	Sumter	7 hr
Dec 25, 7:58 PM CST	Special Weather Statement	BMX	Clay, Talladega	47 min
Dec 25, 8:07 PM CST	Tornado Warning	BMX	Lowndes	46 min
Dec 25, 8:40 PM CST	Tornado Warning	BMX	Autauga, Elmore, Montgomery	65 min
Dec 25, 9:51 PM CST	Severe Thunderstorm Warning	BMX	Montgomery	39 min
Dec 25, 10:18 PM CST	Tornado Warning	BMX	Pike	42 min
Dec 25, 10:22 PM CST	Severe Thunderstorm Warning	BMX	Bullock	38 min
Dec 25, 10:45 PM CST	Severe Thunderstorm Warning	BMX	Macon	45 min
Dec 25, 10:48 PM CST	Severe Thunderstorm Warning	BMX	Bullock, Pike	42 min
Dec 25, 11:24 PM CST	Special Weather Statement	BMX	Barbour, Lee, Russell	66 min
Dec 26, 12:14 AM CST	Special Weather Statement	BMX	Barbour	31 min
Dec 26, 8:57 AM CST	River Flood Warning	BMX	Greene, Hale, Marengo	24 hr

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.