Alert archive / Alabama / Tornado Warnings in 2011

Tornado Warning 138, NWS Birmingham, AL

April 27, 2011Chilton County, Coosa County, Tallapoosa County, Alabama

NWS Birmingham, AL issued this tornado warning at Apr 27, 2011, 9:46 PM CDT for Chilton County, Coosa County, Tallapoosa County, Alabama. It was in force for 37 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 27, 2011, 9:46 PM CDT (02:46 UTC)
Expired: Apr 27, 2011, 10:23 PM CDT
In force: 37 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Chilton County, AL, Coosa County, AL, Tallapoosa County, AL

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 27, 1:42 PM CDT	Tornado Watch PDS	SPC	8 hr
Apr 27, 5:52 PM CDT	Tornado Watch PDS	SPC	9 hr
Apr 27, 9:42 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 2.8 hours before the alert went out and 65 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: 3065 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 711 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: 448 m²/s²
0-3 km storm-relative helicity: 480 m²/s²
Significant tornado parameter: 9.6
Supercell composite: 33.6

Open this sounding in Storm Lab

The text

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

412 
WFUS54 KBMX 280246
TORBMX
ALC021-037-123-280345-
/O.NEW.KBMX.TO.W.0138.110428T0246Z-110428T0345Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
946 PM CDT WED APR 27 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL CHILTON COUNTY IN CENTRAL ALABAMA...
  COOSA COUNTY IN EAST CENTRAL ALABAMA...
  NORTHERN TALLAPOOSA COUNTY IN EAST CENTRAL ALABAMA...

* UNTIL 1045 PM CDT

* AT 944 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM
  WAS LOCATED NEAR VERBENA...OR 5 MILES SOUTHEAST OF CLANTON...AND
  MOVING EAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WEOGUFKA...ROCKFORD...STEWARTVILLE...KELLYTON...GOODWATER...
  ALEXANDER CITY...DADEVILLE...LAY LAKE DAM...HIGGINS FERRY PARK AND
  DOLLAR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.

&&

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

LAT...LON 3281 8565 3275 8621 3275 8631 3277 8631
      3278 8634 3276 8634 3275 8641 3273 8641
      3272 8647 3298 8657 3309 8645 3311 8600
      3309 8600 3309 8598 3311 8598 3312 8581
TIME...MOT...LOC 0246Z 254DEG 44KT 3280 8654

$$

03

3 follow-up statements

884 
WWUS54 KBMX 280301
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1001 PM CDT WED APR 27 2011

ALC021-280311-
/O.CAN.KBMX.TO.W.0138.000000T0000Z-110428T0345Z/
CHILTON AL-
1001 PM CDT WED APR 27 2011

...THE TORNADO WARNING FOR EAST CENTRAL CHILTON COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

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

LAT...LON 3275 8620 3275 8630 3278 8634 3276 8634
      3276 8638 3280 8643 3287 8646 3295 8653
      3301 8653 3309 8645 3311 8600 3309 8600
      3309 8598 3311 8598 3312 8581 3281 8565
TIME...MOT...LOC 0301Z 255DEG 34KT 3282 8640

$$

ALC037-123-280345-
/O.CON.KBMX.TO.W.0138.000000T0000Z-110428T0345Z/
COOSA AL-TALLAPOOSA AL-
1001 PM CDT WED APR 27 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN TALLAPOOSA AND
COOSA COUNTIES UNTIL 1045 PM CDT...

AT 958 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR HIGGINS FERRY PARK...OR 12 MILES EAST OF
CLANTON...MOVING EAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  WEOGUFKA...ROCKFORD...STEWARTVILLE...EQUALITY...KELLYTON...
  GOODWATER...ALEXANDER CITY...DADEVILLE...MARBLE VALLEY AND LYLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.

&&

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

LAT...LON 3275 8620 3275 8630 3278 8634 3276 8634
      3276 8638 3280 8643 3287 8646 3295 8653
      3301 8653 3309 8645 3311 8600 3309 8600
      3309 8598 3311 8598 3312 8581 3281 8565
TIME...MOT...LOC 0301Z 255DEG 34KT 3282 8640

$$

435 
WWUS54 KBMX 280316
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1016 PM CDT WED APR 27 2011

ALC037-123-280345-
/O.CON.KBMX.TO.W.0138.000000T0000Z-110428T0345Z/
COOSA AL-TALLAPOOSA AL-
1016 PM CDT WED APR 27 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN TALLAPOOSA AND
EASTERN COOSA COUNTIES UNTIL 1045 PM CDT...

AT 1012 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR ROCKFORD...MOVING EAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  KELLYTON...GOODWATER...ALEXANDER CITY...DADEVILLE...HANOVER...
  NIXBURG...COTTAGE GROVE...CREWSVILLE...HIGHWAY 9 AND HIGHWAY 22 AND
  HATCHET.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.

&&

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

LAT...LON 3276 8625 3306 8634 3311 8601 3309 8600
      3309 8598 3311 8598 3311 8581 3281 8565
TIME...MOT...LOC 0317Z 251DEG 37KT 3290 8619

$$

03

025 
WWUS54 KBMX 280323
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1023 PM CDT WED APR 27 2011

ALC037-123-280333-
/O.CAN.KBMX.TO.W.0138.000000T0000Z-110428T0345Z/
COOSA AL-TALLAPOOSA AL-
1023 PM CDT WED APR 27 2011

...THE TORNADO WARNING FOR NORTHERN TALLAPOOSA AND EASTERN COOSA
COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED ACROSS THE WARNED 
AREA.

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

LAT...LON 3276 8625 3306 8634 3311 8601 3309 8600
      3309 8598 3311 8598 3311 8581 3281 8565
TIME...MOT...LOC 0323Z 255DEG 34KT 3287 8616

$$

03

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 7:07 PM CDT	Tornado Warning Emergency	BMX	Bibb, Chilton, Shelby	53 min
Apr 27, 7:17 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Marion, Walker, Winston	43 min
Apr 27, 7:17 PM CDT	Tornado Warning Emergency	BMX	Calhoun, Cherokee, Etowah	43 min
Apr 27, 7:28 PM CDT	Tornado Warning	BMX	Hale, Marengo, Sumter	62 min
Apr 27, 7:31 PM CDT	Tornado Warning	BMX	Calhoun, Cleburne, Etowah, St. Clair, Shelby, Talladega	59 min
Apr 27, 7:33 PM CDT	Tornado Warning	BMX	Autauga, Coosa, Elmore, Tallapoosa	57 min
Apr 27, 7:54 PM CDT	Tornado Warning	BMX	St. Clair, Shelby, Talladega	51 min
Apr 27, 8:02 PM CDT	Tornado Warning	BMX	Clay, Cleburne, Coosa, Randolph, Tallapoosa	58 min
Apr 27, 8:03 PM CDT	Tornado Warning	BMX	Blount	15 min
Apr 27, 8:11 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Sumter	64 min
Apr 27, 8:17 PM CDT	Tornado Warning	BMX	Dallas, Hale, Marengo, Perry	58 min
Apr 27, 8:18 PM CDT	Tornado Warning	BMX	Calhoun, Cherokee, Cleburne	42 min
Apr 27, 8:20 PM CDT	Tornado Warning Emergency	BMX	Chambers, Elmore, Lee, Tallapoosa	55 min
Apr 27, 8:21 PM CDT	Tornado Warning	BMX	Calhoun, St. Clair, Talladega	21 min
Apr 27, 9:00 PM CDT	Tornado Warning Emergency	BMX	Chambers	60 min
Apr 27, 9:03 PM CDT	Severe Thunderstorm Warning	BMX	Cherokee	42 min
Apr 27, 9:03 PM CDT	Tornado Warning	BMX	Autauga, Chilton, Dallas, Perry	57 min
Apr 27, 9:36 PM CDT	Severe Thunderstorm Warning	BMX	Dallas, Hale, Marengo, Perry	54 min
Apr 27, 9:37 PM CDT	Tornado Warning	BMX	Chambers, Lee, Tallapoosa	38 min
Apr 27, 9:51 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Etowah	39 min
Apr 27, 9:55 PM CDT	Areal Flood Advisory	BMX	Dallas, Marengo, Perry	3 hr
Apr 27, 10:18 PM CDT	Severe Thunderstorm Warning	BMX	Lee	27 min
Apr 27, 10:31 PM CDT	Tornado Warning	BMX	Lee	12 min
Apr 27, 10:39 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Clay, Coosa, Elmore, Randolph, Tallapoosa	49 min
Apr 27, 11:15 PM CDT	Severe Thunderstorm Warning	BMX	Dallas, Lowndes	45 min
Apr 27, 11:31 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Elmore, Lowndes, Montgomery	44 min
Apr 28, 12:01 AM CDT	Severe Thunderstorm Warning	BMX	Autauga, Bullock, Elmore, Lee, Lowndes, Macon and 3 more	49 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.