Alert archive / Alabama / Tornado Warnings in 2011

Tornado Warning 37, NWS Birmingham, AL

April 11, 2011Bibb County, Tuscaloosa County, Alabama

NWS Birmingham, AL issued this tornado warning at Apr 11, 2011, 6:38 PM CDT for Bibb County, Tuscaloosa County, Alabama. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 11, 2011, 6:38 PM CDT (23:38 UTC)
Expired: Apr 11, 2011, 7:07 PM CDT
In force: 29 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Bibb County, AL, Tuscaloosa County, AL

The radar

The Birmingham radar (KBMX), 40 km from the middle of the area, began a volume at 23:39 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.

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, 11.6 hours before the alert went out and 39 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.

180 
WFUS54 KBMX 112338
TORBMX
ALC007-125-120030-
/O.NEW.KBMX.TO.W.0037.110411T2338Z-110412T0030Z/

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

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN BIBB COUNTY IN CENTRAL ALABAMA...
  SOUTHERN TUSCALOOSA COUNTY IN WEST CENTRAL ALABAMA...

* UNTIL 730 PM CDT

* AT 634 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM
  WAS LOCATED 7 MILES WEST OF MCFARLAND MALL...OR 8 MILES SOUTH OF
  NORTHPORT...AND MOVING EAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  TUSCALOOSA...HOLT...BRYANT DENNY STADIUM...MCFARLAND MALL...
  UNIVERSITY MALL...DEERLICK CREEK CAMPGROUNDS...LAKE WILDWOOD...
  COALING...BROOKWOOD AND BEVILLE LOCK AND DAM.

THIS INCLUDES...
INTERSTATE 20 EXIT NUMBERS 62 THROUGH 100...

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 3322 8771 3332 8716 3331 8715 3330 8708
      3328 8706 3325 8706 3325 8702 3317 8702
      3317 8698 3316 8697 3306 8697 3304 8768
TIME...MOT...LOC 2338Z 260DEG 43KT 3314 8758

$$

27

2 follow-up statements

603 
WWUS54 KBMX 112355
SVSBMX

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

ALC007-125-120030-
/O.CON.KBMX.TO.W.0037.000000T0000Z-110412T0030Z/
BIBB AL-TUSCALOOSA AL-
655 PM CDT MON APR 11 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN TUSCALOOSA
AND NORTHERN BIBB COUNTIES UNTIL 730 PM CDT...

AT 652 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR LAKE WILDWOOD...OR 9 MILES SOUTHEAST OF
HOLT...MOVING EAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  BROOKWOOD...BEVILLE LOCK AND DAM...VANCE...ABERNANT...WOODSTOCK
  JUNCTION...WEST BLOCTON...LAKE VIEW...TANNEHILL IRONWORKS STATE
  PARK...CEDAR COVE AND I 20 REST AREA NEAR TUSCALOOSA.

THIS INCLUDES...
INTERSTATE 20 EXIT NUMBERS 76 THROUGH 100...

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

LAT...LON 3332 8716 3331 8715 3330 8708 3328 8706
      3325 8706 3325 8702 3317 8702 3317 8698
      3316 8697 3306 8697 3305 8751 3325 8753
TIME...MOT...LOC 2355Z 260DEG 43KT 3317 8734

$$

27

077 
WWUS54 KBMX 120007
SVSBMX

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

ALC007-125-120018-
/O.CAN.KBMX.TO.W.0037.000000T0000Z-110412T0030Z/
BIBB AL-TUSCALOOSA AL-
707 PM CDT MON APR 11 2011

...THE TORNADO WARNING FOR SOUTHEASTERN TUSCALOOSA AND NORTHERN BIBB
COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 11 PM CDT.

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

LAT...LON 3332 8716 3331 8715 3330 8708 3328 8706
      3325 8706 3325 8702 3317 8702 3317 8698
      3316 8697 3306 8697 3305 8751 3325 8753
TIME...MOT...LOC 0008Z 260DEG 43KT 3319 8716

$$

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, 6:43 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, 6:52 PM CDT	Tornado Warning	BMX	Blount	38 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.