Alert archive / Alabama / Tornado Warnings in 2011

Tornado Warning 40, NWS Birmingham, AL

April 11, 2011Blount County, Alabama

NWS Birmingham, AL issued this tornado warning at Apr 11, 2011, 6:52 PM CDT for Blount County, Alabama. It was in force for 38 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: Apr 11, 2011, 6:52 PM CDT (23:52 UTC)
Expired: Apr 11, 2011, 7:30 PM CDT
In force: 38 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

County Blount County, AL

The radar

The Birmingham radar (KBMX), 92 km from the middle of the area, began a volume at 23:52 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
Apr 11, 6:58 PM CDT	TSTM WND DMG	4 Wsw Blount Springs, AL	TREES DOWN NEAR MILE MARKER 288 ON INTERSTATE 65.
Apr 11, 7:09 PM CDT	TSTM WND DMG	Blountsville, AL	TREE DOWN ON ROSWELL CREEK RD IN BLOUNTSVILLE.

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
Apr 11, 4:05 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 11.9 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: 9 J/kg
Mixed-layer CIN: -684 J/kg
Mixed-layer LCL: 606 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 179 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.

177 
WFUS54 KBMX 112352
TORBMX
ALC009-120030-
/O.NEW.KBMX.TO.W.0040.110411T2352Z-110412T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
652 PM CDT MON APR 11 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* TORNADO WARNING FOR...
  BLOUNT COUNTY IN CENTRAL ALABAMA...

* UNTIL 730 PM CDT

* AT 648 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM
  WAS LOCATED 6 MILES WEST OF BLOUNT SPRINGS...OR 16 MILES SOUTH OF
  CULLMAN...AND MOVING EAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CLEVELAND...BLOUNTSVILLE...ONEONTA...BLOUNT SPRINGS...HAYDEN...
  BANGOR...NECTAR...LOCUST FORK...FAIRVIEW AND ALLGOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR OF A STURDY BUILDING.

&&

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

LAT...LON 3411 8630 3406 8633 3398 8633 3393 8637
      3392 8634 3389 8635 3384 8697 3387 8698
      3388 8693 3392 8692 3396 8680 3400 8674
      3407 8669 3410 8670 3418 8637
TIME...MOT...LOC 2352Z 255DEG 42KT 3396 8684

$$

27

1 follow-up statement

559 
WWUS54 KBMX 120013
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
713 PM CDT MON APR 11 2011

ALC009-120030-
/O.CON.KBMX.TO.W.0040.000000T0000Z-110412T0030Z/
BLOUNT AL-
713 PM CDT MON APR 11 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL BLOUNT COUNTY
UNTIL 730 PM CDT...

AT 709 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR CLEVELAND...MOVING EAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  ONEONTA...ROSA...SUSAN MOORE...SNEAD...HIGHLAND LAKE AND HENDRIX.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS LINE OF THUNDERSTORMS IS CAPABLE OF PRODUCING TORNADOES AND
WIDESPREAD SIGNIFICANT WIND DAMAGE. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. 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 3411 8630 3406 8633 3398 8633 3393 8637
      3392 8634 3389 8635 3385 8680 3407 8669
      3418 8637
TIME...MOT...LOC 0013Z 255DEG 42KT 3402 8655

$$

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 3:52 AM CDT	Wind Advisory	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	20 hr
Apr 11, 5:12 PM CDT	Special Weather Statement	BMX	Fayette, Lamar, Marion, Winston	48 min
Apr 11, 5:36 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Pickens, Sumter, Tuscaloosa	39 min
Apr 11, 5:42 PM CDT	Tornado Warning	BMX	Fayette, Walker	22 min
Apr 11, 6:08 PM CDT	Tornado Warning	BMX	Greene, Pickens, Tuscaloosa	37 min
Apr 11, 6:13 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Greene, Jefferson, Pickens, Tuscaloosa	47 min
Apr 11, 6:17 PM CDT	Special Weather Statement	BMX	Blount, Walker	43 min
Apr 11, 6:38 PM CDT	Tornado Warning	BMX	Bibb, Tuscaloosa	29 min
Apr 11, 6:43 PM CDT	Tornado Warning	BMX	Greene, Hale	15 min
Apr 11, 6:43 PM CDT	Tornado Warning	BMX	Bibb, Hale, Tuscaloosa	14 min
Apr 11, 6:48 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Dallas, Greene, Hale, Jefferson and 5 more	57 min
Apr 11, 6:53 PM CDT	Tornado Warning	BMX	Jefferson, Tuscaloosa	52 min

Nearby

Tornado Warnings in Alabama, 2011 Every tornado warning in 2011 Tornadoes 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.