Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 271, NWS Birmingham, AL

August 9, 20124 counties in Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Aug 9, 2012, 11:37 AM CDT for 4 counties in Alabama. It was in force for 38 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 9, 2012, 11:37 AM CDT (16:37 UTC)
Expired: Aug 9, 2012, 12:15 PM CDT
In force: 38 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Calhoun County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL

The radar

The Birmingham radar (KBMX), 65 km from the middle of the area, began a volume at 16:38 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 9, 11:52 AM CDT	TSTM WND DMG	Wattsville, AL	SEVERAL TREES DOWN.
Aug 9, 12:01 PM CDT	TSTM WND DMG	Ragland, AL	SEVERAL TREES DOWN.

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, 4.6 hours before the alert went out and 66 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: 1967 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 780 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

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

235 
WUUS54 KBMX 091637
SVRBMX
ALC015-115-117-121-091715-
/O.NEW.KBMX.SV.W.0271.120809T1637Z-120809T1715Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1137 AM CDT THU AUG 9 2012

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN CALHOUN COUNTY IN EAST CENTRAL ALABAMA...
  SOUTHERN ST. CLAIR COUNTY IN ALABAMA...
  NORTHEASTERN SHELBY COUNTY IN ALABAMA...
  NORTHERN TALLADEGA COUNTY IN EAST CENTRAL ALABAMA...

* UNTIL 1215 PM CDT

* AT 1137 AM CDT...EMERGENCY MANAGEMENT REPORTED A LINE OF SEVERE    
  THUNDERSTORMS PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. DAMAGE 
  HAS BEEN REPORTED IN MOODY. THESE STORMS WERE LOCATED ALONG        
  A LINE EXTENDING FROM MOODY TO 6 MILES   SOUTH OF BALD ROCK        
  TO HARPERSVILLE...AND MOVING EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ODENVILLE...PELL CITY...TALLADEGA...BRANCHVILLE...LOGAN MARTIN
  DAM...COOSA ISLAND...ALPINE BAY RESORT AND ALPINE.

THIS INCLUDES...
INTERSTATE 20 EXIT NUMBERS 147 THROUGH 173...
INTERSTATE 59 EXIT NUMBER 148...

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.

&&

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

LAT...LON 3363 8598 3339 8594 3338 8595 3338 8598
      3337 8598 3325 8653 3337 8657 3350 8649
      3370 8652 3383 8609
TIME...MOT...LOC 1637Z 253DEG 26KT 3363 8645 3353 8637
          3337 8640

$$

77/GLEASON

2 follow-up statements

040 
WWUS54 KBMX 091653
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1153 AM CDT THU AUG 9 2012

ALC015-115-117-121-091715-
/O.CON.KBMX.SV.W.0271.000000T0000Z-120809T1715Z/
CALHOUN AL-ST. CLAIR AL-SHELBY AL-TALLADEGA AL-
1153 AM CDT THU AUG 9 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
TALLADEGA...NORTHEASTERN SHELBY...SOUTHERN ST. CLAIR AND SOUTHWESTERN
CALHOUN COUNTIES UNTIL 1215 PM CDT...

AT 1152 AM CDT...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 ODENVILLE TO COOSA ISLAND TO HARPERSVILLE...MOVING EAST AT 30 
MPH.

IN ADDITION...AT 1135 AM CDT THE EMERGENCY MANAGER IN ST CLAIR 
COUNTY REPORTED SEVERAL TREES DOWN IN THE MOODY AREA ASSOCIATED WITH 
THIS LINE OF STORMS.

LOCATIONS IMPACTED INCLUDE...
  PELL CITY...TALLADEGA...ALPINE BAY RESORT...RIVERSIDE...ALPINE...
  LINCOLN...HONDA MANUFACTURING OF ALABAMA...TALLADEGA
  SUPERSPEEDWAY...RAGLAND AND TALLADEGA MUNICIPAL AIRPORT.

THIS INCLUDES...
INTERSTATE 20 EXIT NUMBERS 152 THROUGH 173...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

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

LAT...LON 3325 8652 3351 8643 3370 8650 3383 8609
      3363 8598 3339 8594 3338 8595 3338 8598
      3337 8598
TIME...MOT...LOC 1651Z 253DEG 26KT 3371 8637 3351 8626
          3335 8637

$$

77/GLEASON

939 
WWUS54 KBMX 091706
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1206 PM CDT THU AUG 9 2012

ALC117-091716-
/O.CAN.KBMX.SV.W.0271.000000T0000Z-120809T1715Z/
SHELBY AL-
1206 PM CDT THU AUG 9 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SHELBY COUNTY IS
CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF 
SHELBY COUNTY.

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

LAT...LON 3338 8598 3337 8598 3335 8605 3329 8636
      3354 8628 3375 8634 3383 8609 3363 8598
      3339 8594
TIME...MOT...LOC 1706Z 253DEG 26KT 3375 8622 3354 8612
          3335 8618

$$

ALC015-115-121-091715-
/O.CON.KBMX.SV.W.0271.000000T0000Z-120809T1715Z/
CALHOUN AL-ST. CLAIR AL-TALLADEGA AL-
1206 PM CDT THU AUG 9 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL
TALLADEGA...SOUTHEASTERN ST. CLAIR AND SOUTHWESTERN CALHOUN COUNTIES
UNTIL 1215 PM CDT...

AT 1201 PM CDT...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 6 MILES WEST OF RAGLAND TO LINCOLN TO ALPINE...MOVING EAST AT 30
MPH.

LOCATIONS IMPACTED INCLUDE...
  TALLADEGA...LINCOLN...HONDA MANUFACTURING OF ALABAMA...RAGLAND...
  TALLADEGA SUPERSPEEDWAY...TALLADEGA MUNICIPAL AIRPORT...WALDO...
  JACKSON SHOALS...EASTABOGA AND IRONATON.

THIS INCLUDES...
INTERSTATE 20 EXIT NUMBERS 158 THROUGH 173...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

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

LAT...LON 3338 8598 3337 8598 3335 8605 3329 8636
      3354 8628 3375 8634 3383 8609 3363 8598
      3339 8594
TIME...MOT...LOC 1706Z 253DEG 26KT 3375 8622 3354 8612
          3335 8618

$$

77/GLEASON

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 7:45 PM CDT	Special Weather Statement	BMX	Walker	30 min
Aug 9, 9:29 AM CDT	Special Weather Statement	BMX	Tuscaloosa	46 min
Aug 9, 10:17 AM CDT	Areal Flood Advisory	BMX	Fayette, Lamar, Pickens, Tuscaloosa	3 hr
Aug 9, 10:26 AM CDT	Special Weather Statement	BMX	Jefferson	49 min
Aug 9, 10:36 AM CDT	Special Weather Statement	BMX	Cherokee	39 min
Aug 9, 11:07 AM CDT	Special Weather Statement	BMX	Jefferson	38 min
Aug 9, 11:12 AM CDT	Special Weather Statement	BMX	Clay	48 min
Aug 9, 11:21 AM CDT	Areal Flood Advisory	BMX	Blount, Jefferson, St. Clair, Shelby	114 min
Aug 9, 11:46 AM CDT	Areal Flood Advisory	BMX	Etowah	119 min
Aug 9, 12:02 PM CDT	Special Weather Statement	BMX	Etowah	43 min
Aug 9, 12:15 PM CDT	Special Weather Statement	BMX	Calhoun, Clay, Cleburne, Talladega	45 min
Aug 9, 12:24 PM CDT	Areal Flood Advisory	BMX	Calhoun, Clay, Talladega	111 min
Aug 9, 1:49 PM CDT	Areal Flood Advisory	BMX	Marengo, Sumter	116 min
Aug 9, 3:43 PM CDT	Special Weather Statement	BMX	Dallas	47 min
Aug 9, 4:33 PM CDT	Areal Flood Advisory	BMX	Elmore, Macon, Montgomery	3 hr
Aug 9, 4:42 PM CDT	Areal Flood Advisory	BMX	Autauga, Lowndes	3 hr
Aug 9, 5:01 PM CDT	Special Weather Statement	BMX	Lee	44 min
Aug 9, 5:13 PM CDT	Areal Flood Advisory	BMX	Lee	2 hr
Aug 9, 5:21 PM CDT	Areal Flood Advisory	BMX	Shelby	114 min
Aug 9, 5:41 PM CDT	Flash Flood Warning	BMX	Shelby	3 hr
Aug 9, 6:39 PM CDT	Special Weather Statement	BMX	Talladega	51 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.