Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 15, NWS Birmingham, AL

February 24, 20115 counties in Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Feb 24, 2011, 11:25 PM CST for 5 counties in Alabama. It was in force for 50 min. 12 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: Feb 24, 2011, 11:25 PM CST (05:25 UTC)
Expired: Feb 25, 2011, 12:15 AM CST
In force: 50 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Blount County, AL, Etowah County, AL, Jefferson County, AL, St. Clair County, AL, Walker County, AL

The radar

The Birmingham radar (KBMX), 93 km from the middle of the area, began a volume at 05:27 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
Feb 24, 11:41 PM CST	TSTM WND DMG	4 Wsw Turkey Creek Morr, AL	TREES DOWN ON THOMAS LOOP RD.
Feb 24, 11:47 PM CST	TSTM WND DMG	2 N Dallas, AL	TREE DOWN BLOCKING HWY 79 AT DALLAS SELFVILLE FIRE DEPARTMENT.
Feb 24, 11:47 PM CST	TSTM WND DMG	5 Wsw Cleveland, AL	POWERLINES DOWN ON MOUNT VIEW TRAIL AND CO HWY 11.
Feb 24, 11:50 PM CST	TSTM WND DMG	Gardendale, AL	SEVERAL POWER POLES KNOCKED DOWN.
Feb 24, 11:54 PM CST	TSTM WND DMG	5 Sse Cleveland, AL	TREE DOWN ACROSS CO HWY 1.
Feb 24, 11:57 PM CST	TSTM WND DMG	Pinson, AL	POWER POLE KNOCKED DOWN
Feb 24, 11:58 PM CST	TSTM WND DMG	Allgood, AL	ROOF BLOWN OFF BARN
Feb 25, 12:08 AM CST	TSTM WND DMG	Gallant, AL	WIDESPREAD TREES AND POWERLINES DOWN IN AND AROUND GALLANT.
Feb 25, 12:13 AM CST	TSTM WND DMG	3 E Gallant, AL	TREES BLOWN DOWN ON ROCKY HOLLOW ROAD.
Feb 25, 12:15 AM CST	TSTM WND DMG	Sardis City, AL	SEVERAL TREES UPROOTED AND DAMAGE TO A SHED AND BARN ALONG JACK FLOYD ST, BROADWELL RD, AND HORTON CIRCLE. ESTIMATED WINDS OF 70-75 MPH.
Feb 25, 12:17 AM CST	TSTM WND DMG	3 N Wattsville, AL	POWERLINES DOWN ON 231 AT RATTLESNAKE HILL.
Feb 25, 12:25 AM CST	TSTM WND DMG	Gadsden, AL	LARGE TREE DOWN ON POWERLINES ALONG MEIGHAN BLVD. WINDS EST AT 58 MPH.

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
Feb 24, 8:30 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 5.4 hours before the alert went out and 92 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: 52 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1096 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

770 
WUUS54 KBMX 250525
SVRBMX
ALC009-055-073-115-127-250615-
/O.NEW.KBMX.SV.W.0015.110225T0525Z-110225T0615Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1125 PM CST THU FEB 24 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BLOUNT COUNTY IN CENTRAL ALABAMA...
  ETOWAH COUNTY IN NORTHEAST ALABAMA...
  NORTHEASTERN JEFFERSON COUNTY IN CENTRAL ALABAMA...
  NORTHERN ST. CLAIR COUNTY IN CENTRAL ALABAMA...
  EAST CENTRAL WALKER COUNTY IN CENTRAL ALABAMA...

* UNTIL 1215 AM CST

* AT 1121 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
  11 MILES NORTH OF CULLMAN TO 7 MILES NORTH OF ARKADELPHIA TO GORGAS
  STEAM PLANT...AND MOVING EAST AT 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BLOUNTSVILLE...CLEVELAND...ONEONTA...PINSON-CLAY-CHALKVILLE...
  SPRINGVILLE...ODENVILLE...GADSDEN AND RAINBOW CITY.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 272 THROUGH 282...
US 78 EXIT NUMBER 78...
INTERSTATE 59 EXIT NUMBERS 148 THROUGH 188...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

THESE STORMS HAVE A HISTORY OF PRODUCING DESTRUCTIVE WINDS. SEEK 
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 AM CST FRIDAY MORNING FOR
NORTHERN ALABAMA.

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

LAT...LON 3411 8630 3420 8618 3421 8584 3397 8594
      3385 8606 3368 8616 3370 8617 3369 8620
      3366 8617 3367 8719 3390 8704 3387 8695
      3392 8692 3396 8680 3405 8670 3409 8670
      3413 8660 3426 8652 3427 8645
TIME...MOT...LOC 0525Z 270DEG 53KT 3432 8671 3397 8687
          3362 8712

$$

27

1 follow-up statement

566 
WWUS54 KBMX 250605
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1205 AM CST FRI FEB 25 2011

ALC127-250615-
/O.CAN.KBMX.SV.W.0015.000000T0000Z-110225T0615Z/
WALKER AL-
1205 AM CST FRI FEB 25 2011

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WALKER COUNTY IS
CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA.

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

LAT...LON 3423 8643 3411 8630 3420 8618 3421 8584
      3397 8594 3385 8606 3368 8616 3370 8617
      3369 8620 3366 8617 3367 8678
TIME...MOT...LOC 0605Z 270DEG 53KT 3432 8600 3397 8616
          3362 8641

$$

ALC009-055-073-115-250615-
/O.CON.KBMX.SV.W.0015.000000T0000Z-110225T0615Z/
JEFFERSON AL-ST. CLAIR AL-ETOWAH AL-BLOUNT AL-
1205 AM CST FRI FEB 25 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
BLOUNT...ETOWAH...NORTHERN ST. CLAIR AND NORTHEASTERN JEFFERSON
COUNTIES UNTIL 1215 AM CST...

AT 1202 AM 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 10 MILES EAST OF ALBERTVILLE TO STEELE TO MOODY...MOVING EAST AT
60 MPH.

LOCATIONS IMPACTED INCLUDE...
  GADSDEN...RAINBOW CITY...ATTALLA...REECE CITY...NOCCALULA FALLS...
  GADSDEN MALL...RAGLAND...ANDERSON...TABOR ROAD AND RIDGEVILLE.

THIS INCLUDES...
INTERSTATE 59 EXIT NUMBERS 148 THROUGH 188...

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 3423 8643 3411 8630 3420 8618 3421 8584
      3397 8594 3385 8606 3368 8616 3370 8617
      3369 8620 3366 8617 3367 8678
TIME...MOT...LOC 0605Z 270DEG 53KT 3432 8600 3397 8616
          3362 8641

$$

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 24, 9:35 PM CST	Severe Thunderstorm Warning	BMX	Fayette, Lamar, Marion	40 min
Feb 24, 9:57 PM CST	Tornado Warning	BMX	Marion	33 min
Feb 24, 10:04 PM CST	Severe Thunderstorm Warning	BMX	Greene, Pickens	41 min
Feb 24, 10:10 PM CST	Severe Thunderstorm Warning	BMX	Fayette, Lamar, Marion, Walker, Winston	50 min
Feb 24, 10:30 PM CST	Tornado Warning	BMX	Fayette, Walker	45 min
Feb 24, 10:41 PM CST	Severe Thunderstorm Warning	BMX	Fayette, Greene, Jefferson, Lamar, Pickens, Tuscaloosa and 1 more	49 min
Feb 24, 10:44 PM CST	Severe Thunderstorm Warning	BMX	Fayette, Walker, Winston	46 min
Feb 24, 11:16 PM CST	Tornado Warning	BMX	Blount, Walker	44 min
Feb 24, 11:21 PM CST	Tornado Warning	BMX	Blount, Jefferson, Walker	39 min
Feb 24, 11:24 PM CST	Severe Thunderstorm Warning	BMX	Bibb, Greene, Hale, Jefferson, St. Clair, Shelby and 3 more	66 min
Feb 24, 11:26 PM CST	Severe Thunderstorm Warning	BMX	Blount, Etowah, Jefferson, St. Clair	49 min
Feb 24, 11:38 PM CST	Severe Thunderstorm Warning	BMX	Dallas, Greene, Hale, Marengo, Perry, Sumter	67 min
Feb 25, 12:09 AM CST	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Cleburne, Etowah, St. Clair	57 min
Feb 25, 12:12 AM CST	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Clay, Coosa, Shelby, Talladega	63 min
Feb 25, 12:29 AM CST	Tornado Warning	BMX	Cherokee, Etowah	46 min
Feb 25, 1:17 AM CST	Severe Thunderstorm Warning	BMX	Calhoun, Clay, Cleburne, Randolph, Talladega	43 min
Feb 25, 2:06 AM CST	Special Weather Statement	BMX	Bullock, Chambers, Elmore, Lee, Lowndes, Macon and 3 more	39 min
Feb 25, 2:45 AM CST	Special Weather Statement	BMX	Barbour, Bullock, Lee, Macon, Russell	45 min
Feb 25, 3:35 AM CST	Special Weather Statement	BMX	Barbour, Pike, Russell	40 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.