Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 244, NWS Birmingham, AL

July 10, 20125 counties in Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jul 10, 2012, 4:17 PM CDT for 5 counties in Alabama. It was in force for 43 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: Jul 10, 2012, 4:17 PM CDT (21:17 UTC)
Expired: Jul 10, 2012, 5:00 PM CDT
In force: 43 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Bibb County, AL, Chilton County, AL, Coosa County, AL, Elmore County, AL, Shelby County, AL

The radar

The Birmingham radar (KBMX), 25 km from the middle of the area, began a volume at 21:17 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
Jul 10, 4:34 PM CDT	TSTM WND DMG	Clanton, AL	SEVERAL TREES AND POWER LINES WERE BLOWN DOWN IN AND AROUND CLANTON.
Jul 10, 5:10 PM CDT	TSTM WND DMG	Alabaster, AL	TREES AND POWER LINES DOWN ON INDEPENDENCE DRIVE.

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, 9.3 hours before the alert went out and 26 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: 923 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 611 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -32 m²/s²
0-3 km storm-relative helicity: 23 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.

245 
WUUS54 KBMX 102117
SVRBMX
ALC007-021-037-051-117-102200-
/O.NEW.KBMX.SV.W.0244.120710T2117Z-120710T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
417 PM CDT TUE JUL 10 2012

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BIBB COUNTY IN ALABAMA...
  CHILTON COUNTY IN ALABAMA...
  COOSA COUNTY IN EAST CENTRAL ALABAMA...
  NORTHWESTERN ELMORE COUNTY IN EAST CENTRAL ALABAMA...
  SOUTHERN SHELBY COUNTY IN ALABAMA...

* UNTIL 500 PM CDT

* AT 412 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
  EOLINE TO TALLADEGA NATIONAL FOREST TO BILLINGSLEY TO DEATSVILLE...
  AND MOVING NORTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CLANTON...JEMISON...MONTEVALLO...EQUALITY...CALERA...ROCKFORD...
  ALABASTER AND HELENA.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 200 THROUGH 242...

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 REPORTS OF 
50 TO 60 MPH...AND REPORTS OF TREES DOWN. THIS IS A DANGEROUS 
SITUATION. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY 
FROM WINDOWS.

&&

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

LAT...LON 3301 8732 3313 8728 3313 8720 3322 8717
      3325 8699 3333 8688 3312 8646 3310 8648
      3309 8601 3291 8601 3272 8611 3261 8624
      3265 8641 3271 8641 3266 8700 3284 8702
      3283 8731 3287 8732 3288 8742 3300 8742
TIME...MOT...LOC 2116Z 213DEG 27KT 3306 8716 3289 8697
          3271 8666 3263 8636

$$

56

1 follow-up statement

219 
WWUS54 KBMX 102136
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
436 PM CDT TUE JUL 10 2012

ALC007-021-037-051-117-102200-
/O.CON.KBMX.SV.W.0244.000000T0000Z-120710T2200Z/
BIBB AL-CHILTON AL-COOSA AL-ELMORE AL-SHELBY AL-
436 PM CDT TUE JUL 10 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
SHELBY...NORTHWESTERN ELMORE...COOSA...CHILTON AND BIBB COUNTIES
UNTIL 500 PM CDT...

AT 436 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 TANNEHILL IRONWORKS STATE PARK TO BRIERFIELD IRONWORKS PARK TO
CLANTON TO SPEED...MOVING NORTHEAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  MONTEVALLO...EQUALITY...CALERA...ROCKFORD...ALABASTER...HELENA...
  WEOGUFKA...COLUMBIANA...KELLYTON AND STEWARTVILLE.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 200 THROUGH 242...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

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

LAT...LON 3313 8728 3313 8720 3322 8717 3325 8699
      3333 8688 3312 8646 3310 8648 3309 8601
      3291 8601 3273 8610 3268 8620 3271 8641
      3273 8689 3284 8702 3293 8726 3301 8732
TIME...MOT...LOC 2136Z 213DEG 27KT 3319 8706 3302 8687
          3283 8656 3275 8626

$$

56

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 7:22 PM CDT	Special Weather Statement	BMX	Randolph	23 min
Jul 9, 7:29 PM CDT	Special Weather Statement	BMX	Coosa, Jefferson, Shelby, Talladega	61 min
Jul 9, 7:30 PM CDT	Special Weather Statement	BMX	Chambers, Lee, Russell, Tallapoosa	45 min
Jul 9, 8:00 PM CDT	Special Weather Statement	BMX	Cleburne	30 min
Jul 9, 8:30 PM CDT	Special Weather Statement	BMX	Calhoun, Cleburne, St. Clair	45 min
Jul 9, 9:15 PM CDT	Special Weather Statement	BMX	Calhoun, Cleburne, St. Clair	45 min
Jul 9, 9:57 PM CDT	Special Weather Statement	BMX	Calhoun, Cherokee, Cleburne, Etowah	48 min
Jul 9, 10:36 PM CDT	Areal Flood Advisory	BMX	Cleburne	114 min
Jul 10, 2:46 PM CDT	Special Weather Statement	BMX	Lowndes, Montgomery, Pike	59 min
Jul 10, 2:49 PM CDT	Special Weather Statement	BMX	Greene	26 min
Jul 10, 3:37 PM CDT	Special Weather Statement	BMX	Autauga, Chilton, Elmore, Montgomery	53 min
Jul 10, 3:44 PM CDT	Special Weather Statement	BMX	Tuscaloosa	46 min
Jul 10, 4:02 PM CDT	Severe Thunderstorm Warning	BMX	Tuscaloosa	28 min
Jul 10, 4:27 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Tuscaloosa, Walker	48 min
Jul 10, 4:35 PM CDT	Special Weather Statement	BMX	Fayette, Lamar, Marion, Walker, Winston	40 min
Jul 10, 4:37 PM CDT	Special Weather Statement	BMX	Elmore, Macon, Russell, Tallapoosa	38 min
Jul 10, 4:56 PM CDT	Severe Thunderstorm Warning	BMX	Chilton, Clay, Coosa, St. Clair, Shelby, Talladega and 1 more	49 min
Jul 10, 5:11 PM CDT	Special Weather Statement	BMX	Lee, Macon, Russell	49 min
Jul 10, 5:28 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Lee, Russell	50 min
Jul 10, 5:44 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Clay, Cleburne, Randolph, St. Clair, Shelby and 1 more	44 min
Jul 10, 6:27 PM CDT	Special Weather Statement	BMX	Blount, Calhoun, Cherokee, Clay, Cleburne, Etowah and 2 more	48 min
Jul 10, 6:47 PM CDT	Areal Flood Advisory	BMX	Blount	58 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.