Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 409, NWS Birmingham, AL

September 14, 2011Walker County, Winston County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Sep 14, 2011, 7:10 PM CDT for Walker County, Winston County, Alabama. It was in force for 35 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: Sep 14, 2011, 7:10 PM CDT (00:10 UTC)
Expired: Sep 14, 2011, 7:45 PM CDT
In force: 35 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Walker County, AL, Winston County, AL

The radar

The Columbus AFB radar (KGWX), 88 km from the middle of the area, began a volume at 00:12 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
Sep 14, 7:10 PM CDT	TSTM WND DMG	Haleyville, AL	SEVERAL TREES REPORTED DOWN AROUND THE CITY OF HALEYVILLE. TIME ESTIMATED FROM RADAR.
Sep 14, 7:18 PM CDT	TSTM WND DMG	2 E Natural Bridge, AL	TREES DOWN BLOCKING ONE LANE OF U.S. HIGHWAY 278.

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 00:00Z, 0.2 hours before the alert went out and 110 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2073 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 82 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.

016 
WUUS54 KBMX 150010
SVRBMX
ALC127-133-150045-
/O.NEW.KBMX.SV.W.0409.110915T0010Z-110915T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
710 PM CDT WED SEP 14 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN WALKER COUNTY IN ALABAMA...
  SOUTHWESTERN WINSTON COUNTY IN NORTHWEST ALABAMA...

* UNTIL 745 PM CDT

* AT 707 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
  MPH.  THIS STORM WAS LOCATED 5 MILES EAST OF LAKE BUTTAHATCHEE...OR
  7 MILES NORTHWEST OF LYNN...AND MOVING SOUTHEAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  LYNN...CARBON HILL...ARLEY...ELDRIDGE...WINSTON FREE STATE BARN...
  DOUBLE SPRINGS...HOUSTON RECREATIONAL AREA AND ASHBANK.

THIS INCLUDES...
US 78 EXIT NUMBERS 39 THROUGH 52...

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 3410 8717 3399 8722 3386 8727 3388 8763
      3401 8764 3428 8763
TIME...MOT...LOC 0010Z 303DEG 37KT 3412 8758

$$

27

1 follow-up statement

263 
WWUS54 KBMX 150023
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
723 PM CDT WED SEP 14 2011

ALC127-133-150045-
/O.CON.KBMX.SV.W.0409.000000T0000Z-110915T0045Z/
WALKER AL-WINSTON AL-
723 PM CDT WED SEP 14 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WINSTON AND
NORTHWESTERN WALKER COUNTIES UNTIL 745 PM CDT...

AT 721 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 ASHBANK...OR NEAR LYNN...MOVING
SOUTHEAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  CARBON HILL...ARLEY...POPLAR SPRINGS...CORINTH REC AREA...MCDOWELL
  CAMP GROUNDS...FALLS CITY...WINSTON COUNTY AIRPORT...BLACK POND...
  CURTIS CROSSROADS AND LUPTON.

THIS INCLUDES...
US 78 EXIT NUMBERS 39 THROUGH 52...

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

LAT...LON 3401 8762 3426 8758 3410 8717 3399 8722
      3386 8727 3388 8763
TIME...MOT...LOC 0024Z 303DEG 37KT 3404 8744

$$

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 14, 7:02 PM CDT	Special Weather Statement	BMX	Winston	43 min
Sep 14, 7:16 PM CDT	Special Weather Statement	BMX	Fayette	44 min
Sep 14, 7:21 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Walker	39 min
Sep 14, 7:35 PM CDT	Special Weather Statement	BMX	Marion	40 min
Sep 14, 7:42 PM CDT	Special Weather Statement	BMX	Walker	48 min
Sep 14, 7:49 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Marion, Walker	41 min
Sep 14, 8:29 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Jefferson, Tuscaloosa, Walker	46 min
Sep 14, 8:42 PM CDT	Special Weather Statement	BMX	Jefferson, Shelby	33 min
Sep 14, 9:17 PM CDT	Special Weather Statement	BMX	Jefferson, St. Clair, Shelby	43 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.