Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 12, NWS Birmingham, AL

February 24, 20117 counties in Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Feb 24, 2011, 10:41 PM CST for 7 counties in Alabama. It was in force for 49 min. 6 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, 10:41 PM CST (04:41 UTC)
Expired: Feb 24, 2011, 11:30 PM CST
In force: 49 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Fayette County, AL, Greene County, AL, Jefferson County, AL, Lamar County, AL, Pickens County, AL, Tuscaloosa County, AL, Walker County, AL

The radar

The Columbus AFB radar (KGWX), 71 km from the middle of the area, began a volume at 04:43 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, 11:00 PM CST	TSTM WND DMG	5 N Boley Springs, AL	TREES DOWN BLOCKING ROAD ON HWY 18 AT THE FAYETTE/WALKER COUNTY LINE.
Feb 24, 11:09 PM CST	TSTM WND DMG	1 Se Jasper, AL	DAMAGE TO EASTSIDE BAPTIST CHURCH ON HIGHWAY 118 NEXT TO THE JASPER MALL.
Feb 24, 11:12 PM CST	TSTM WND DMG	Sipsey, AL	TREES DOWN.
Feb 24, 11:22 PM CST	TSTM WND DMG	2 Ne Gorgas, AL	POWER LINES BLOWN DOWN IN COPELAND FERRY.
Feb 24, 11:28 PM CST	TSTM WND DMG	Northport, AL	TREE BLOWN DOWN ON KICKER ROAD. TREE BLOWN DOWN ON NEW WATERMELON ROAD.
Feb 24, 11:28 PM CST	TSTM WND GST 60	Northport, AL	WINDS ESTIMATED AROUND 60 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, 4.7 hours before the alert went out and 97 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.

845 
WUUS54 KBMX 250441
SVRBMX
ALC057-063-073-075-107-125-127-250530-
/O.NEW.KBMX.SV.W.0012.110225T0441Z-110225T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1041 PM CST THU FEB 24 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  FAYETTE COUNTY IN WEST CENTRAL ALABAMA...
  NORTHERN GREENE COUNTY IN WEST CENTRAL ALABAMA...
  WEST CENTRAL JEFFERSON COUNTY IN CENTRAL ALABAMA...
  SOUTHEASTERN LAMAR COUNTY IN WEST CENTRAL ALABAMA...
  PICKENS COUNTY IN WEST CENTRAL ALABAMA...
  TUSCALOOSA COUNTY IN WEST CENTRAL ALABAMA...
  SOUTHERN WALKER COUNTY IN CENTRAL ALABAMA...

* UNTIL 1130 PM CST

* AT 1039 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
  GLEN ALLEN TO ASHCRAFT CORNER TO PICKENSVILLE...AND MOVING EAST AT
  60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  REFORM...CARROLLTON...GORDO...CORDOVA...NORTHPORT...TUSCALOOSA...
  HOLT AND DORA.

THIS INCLUDES...
US 78 EXIT NUMBERS 61 THROUGH 78...
INTERSTATE 20 EXIT NUMBERS 62 THROUGH 86...

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.

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 3352 8805 3383 8783 3386 8697 3301 8739
      3300 8835
TIME...MOT...LOC 0441Z 270DEG 53KT 3382 8770 3352 8791
          3324 8818

$$

27

1 follow-up statement

974 
WWUS54 KBMX 250457
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1057 PM CST THU FEB 24 2011

ALC075-250507-
/O.CAN.KBMX.SV.W.0012.000000T0000Z-110225T0530Z/
LAMAR AL-
1057 PM CST THU FEB 24 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LAMAR 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 3342 8794 3378 8767 3386 8697 3301 8739
      3300 8835
TIME...MOT...LOC 0457Z 270DEG 53KT 3381 8741 3351 8763
          3324 8790

$$

ALC057-063-073-107-125-127-250530-
/O.CON.KBMX.SV.W.0012.000000T0000Z-110225T0530Z/
GREENE AL-PICKENS AL-TUSCALOOSA AL-JEFFERSON AL-FAYETTE AL-WALKER AL-
1057 PM CST THU FEB 24 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
WALKER...SOUTHEASTERN FAYETTE...WEST CENTRAL JEFFERSON...
TUSCALOOSA...SOUTHERN PICKENS AND NORTHERN GREENE COUNTIES UNTIL 1130
PM CST...

AT 1053 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 6 MILES SOUTH OF CARBON HILL TO 8 MILES NORTHWEST OF SAMANTHA TO
7 MILES SOUTHWEST OF GORDO...MOVING EAST AT 60 MPH.

LOCATIONS IMPACTED INCLUDE...
  CORDOVA...NORTHPORT...TUSCALOOSA...HOLT...DORA...SUMITON...JENA...
  OAKMAN...SAMANTHA AND LAKE TUSCALOOSA BINION CREEK LANDING.

THIS INCLUDES...
US 78 EXIT NUMBERS 61 THROUGH 78...
INTERSTATE 20 EXIT NUMBERS 62 THROUGH 79...

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.

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS.

&&

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

LAT...LON 3342 8794 3378 8767 3386 8697 3301 8739
      3300 8835
TIME...MOT...LOC 0457Z 270DEG 53KT 3381 8741 3351 8763
          3324 8790

$$

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, 10:44 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, 11:25 PM CST	Severe Thunderstorm Warning	BMX	Blount, Etowah, Jefferson, St. Clair, Walker	50 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.