Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 308, NWS Birmingham, AL

June 21, 20114 counties in Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jun 21, 2011, 4:06 PM CDT for 4 counties in Alabama. It was in force for 39 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 21, 2011, 4:06 PM CDT (21:06 UTC)
Expired: Jun 21, 2011, 4:45 PM CDT
In force: 39 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

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

The radar

The Birmingham radar (KBMX), 117 km from the middle of the area, began a volume at 21:08 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 21, 4:23 PM CDT	TSTM WND DMG	Ohatchee, AL	TREE BLOCKED MOHAWK CLIFF ROAD NEAR OHATCHEE.

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, 9.1 hours before the alert went out and 117 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: 1519 J/kg
Mixed-layer CIN: -112 J/kg
Mixed-layer LCL: 1076 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -80 m²/s²
0-3 km storm-relative helicity: -76 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.

267 
WUUS54 KBMX 212106
SVRBMX
ALC015-055-115-121-212145-
/O.NEW.KBMX.SV.W.0308.110621T2106Z-110621T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
406 PM CDT TUE JUN 21 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CALHOUN COUNTY IN EAST CENTRAL ALABAMA...
  SOUTHEASTERN ETOWAH COUNTY IN NORTHEAST ALABAMA...
  EAST CENTRAL ST. CLAIR COUNTY IN ALABAMA...
  NORTH CENTRAL TALLADEGA COUNTY IN EAST CENTRAL ALABAMA...

* UNTIL 445 PM CDT

* AT 403 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
  MPH.  THIS STORM WAS LOCATED NEAR LINCOLN...OR 10 MILES NORTHEAST
  OF PELL CITY...AND MOVING NORTHEAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SAKS...MARKTON...JACKSONVILLE...HOKES BLUFF...RAGLAND...OHATCHEE...
  BLUE MOUNTAIN AND WEAVER.

THIS INCLUDES...
INTERSTATE 20 EXIT NUMBER 173...

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.

LAT...LON 3408 8587 3388 8562 3387 8564 3385 8564
      3384 8560 3355 8606 3374 8624
TIME...MOT...LOC 2106Z 222DEG 38KT 3368 8612

$$

03

1 follow-up statement

435 
WWUS54 KBMX 212134
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
434 PM CDT TUE JUN 21 2011

ALC121-212144-
/O.CAN.KBMX.SV.W.0308.000000T0000Z-110621T2145Z/
TALLADEGA AL-
434 PM CDT TUE JUN 21 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL TALLADEGA COUNTY
IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

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

LAT...LON 3388 8562 3387 8564 3385 8564 3384 8560
      3363 8594 3384 8613 3408 8587
TIME...MOT...LOC 2134Z 221DEG 35KT 3382 8599

$$

ALC015-055-115-212145-
/O.CON.KBMX.SV.W.0308.000000T0000Z-110621T2145Z/
CALHOUN AL-ETOWAH AL-ST. CLAIR AL-
434 PM CDT TUE JUN 21 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EXTREME EAST
CENTRAL ST. CLAIR...SOUTHEASTERN ETOWAH AND CALHOUN COUNTIES UNTIL
445 PM CDT...

AT 431 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED NEAR OHATCHEE...OR 5 MILES SOUTH OF
MARKTON...MOVING NORTHEAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  MARKTON...HOKES BLUFF...JACKSONVILLE...WEAVER...GLENCOE...
  SOUTHSIDE...COBB CITY AND REAVES.

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

LAT...LON 3388 8562 3387 8564 3385 8564 3384 8560
      3363 8594 3384 8613 3408 8587
TIME...MOT...LOC 2134Z 221DEG 35KT 3382 8599

$$

03

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 9:50 PM CDT	Special Weather Statement	BMX	Lamar	25 min
Jun 20, 10:04 PM CDT	Special Weather Statement	BMX	Fayette	26 min
Jun 21, 12:09 PM CDT	Special Weather Statement	BMX	Etowah, St. Clair	51 min
Jun 21, 1:00 PM CDT	Special Weather Statement	BMX	Etowah	30 min
Jun 21, 1:14 PM CDT	Severe Thunderstorm Warning	BMX	Lamar, Pickens	26 min
Jun 21, 1:19 PM CDT	Special Weather Statement	BMX	Calhoun	41 min
Jun 21, 1:30 PM CDT	Special Weather Statement	BMX	Greene, Pickens	45 min
Jun 21, 1:37 PM CDT	Special Weather Statement	BMX	Tallapoosa	38 min
Jun 21, 1:48 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Pickens, Tuscaloosa	20 min
Jun 21, 2:01 PM CDT	Special Weather Statement	BMX	Calhoun	44 min
Jun 21, 2:08 PM CDT	Special Weather Statement	BMX	Blount	52 min
Jun 21, 2:19 PM CDT	Special Weather Statement	BMX	Elmore	41 min
Jun 21, 2:23 PM CDT	Special Weather Statement	BMX	Fayette, Tuscaloosa	52 min
Jun 21, 2:35 PM CDT	Special Weather Statement	BMX	Bibb, Shelby	40 min
Jun 21, 2:40 PM CDT	Special Weather Statement	BMX	Etowah	50 min
Jun 21, 3:03 PM CDT	Special Weather Statement	BMX	Blount, Jefferson	57 min
Jun 21, 3:24 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Jefferson, St. Clair, Shelby	51 min
Jun 21, 3:36 PM CDT	Severe Thunderstorm Warning	BMX	St. Clair, Shelby, Talladega	39 min
Jun 21, 3:53 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Etowah, St. Clair	52 min
Jun 21, 4:43 PM CDT	Special Weather Statement	BMX	Cherokee	47 min
Jun 21, 5:14 PM CDT	Special Weather Statement	BMX	Talladega	46 min
Jun 21, 5:26 PM CDT	Severe Thunderstorm Warning	BMX	St. Clair, Shelby, Talladega	24 min
Jun 21, 6:32 PM CDT	Special Weather Statement	BMX	Etowah	43 min
Jun 21, 6:57 PM CDT	Special Weather Statement	BMX	Lowndes	48 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2011 Every severe thunderstorm warning in 2011

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.