Alert archive / Alabama / Tornado Warnings in 2011

Tornado Warning 123, NWS Birmingham, AL

April 27, 2011Bibb County, Chilton County, Shelby County, Alabama

NWS Birmingham, AL issued this tornado warning at Apr 27, 2011, 7:07 PM CDT for Bibb County, Chilton County, Shelby County, Alabama. It was in force for 53 min. 1 report 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 27, 2011, 7:07 PM CDT (00:07 UTC)
Expired
Apr 27, 2011, 8:00 PM CDT
In force
53 min
Issued by
NWS Birmingham, AL
Area
Storm-based polygon
Emergency
Tornado emergency

Counties Bibb County, AL, Chilton County, AL, Shelby County, AL

The radar

The Birmingham radar (KBMX), 23 km from the middle of the area, began a volume at 00:08 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

TimeReportWhereRemark
Apr 27, 7:32 PM CDTTORNADO 12 S Marvel, ALAN EF-1 TORNADO TOUCHED DOWN IN NORTHEAST BIBB COUNTY JUST SOUTH OF MARVEL AND MOVED NORTHEAST INTO SOUTHWEST SHELBY COUNTY SNAPPING OFF DOZENS OF PINE TREES. NO STRUCTURAL DAMAGE WAS NOTED ALONG THE PATH. THE TRACK WAS 5.4 MILES LONG...50 YARDS WIDE...WITH PE

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.

IssuedProductOfficeLasted
Apr 27, 1:42 PM CDTTornado Watch PDSSPC8 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 0.1 hours before the alert went out and 22 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-pSkew-T log-p diagram, Birmingham, AL at 00:00Z on 2011-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3065 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 00:00Z on 2011-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 448 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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.

397 
WFUS54 KBMX 280007
TORBMX
ALC007-021-117-280100-
/O.NEW.KBMX.TO.W.0123.110428T0007Z-110428T0100Z/

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

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* TORNADO WARNING FOR...
  BIBB COUNTY IN CENTRAL ALABAMA...
  NORTH CENTRAL CHILTON COUNTY IN CENTRAL ALABAMA...
  SHELBY COUNTY IN CENTRAL ALABAMA...

* UNTIL 800 PM CDT

* AT 704 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM
  WAS LOCATED NEAR MERTZ...OR 10 MILES WEST OF BRENT...AND MOVING
  NORTHEAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BRENT...CENTREVILLE...MONTEVALLO...CALERA...HELENA...ALABASTER...
  PELHAM...COLUMBIANA...CHELSEA AND HARRISBURG.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 228 THROUGH 247...

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 3301 8739 3301 8731 3310 8731 3314 8728
      3314 8719 3320 8718 3323 8715 3323 8710
      3325 8698 3337 8682 3338 8678 3345 8668
      3314 8646 3310 8651 3305 8652 3284 8728
TIME...MOT...LOC 0007Z 241DEG 42KT 3294 8730

$$

17
3 follow-up statements
074 
WWUS54 KBMX 280023
SVSBMX

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

ALC007-021-117-280100-
/O.CON.KBMX.TO.W.0123.000000T0000Z-110428T0100Z/
CHILTON AL-BIBB AL-SHELBY AL-
723 PM CDT WED APR 27 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SHELBY...BIBB AND NORTH
CENTRAL CHILTON COUNTIES UNTIL 800 PM CDT...

...TORNADO EMERGENCY CONTINUES FOR SIX MILE...MARVEL...AND  
MONTEVALLO...

AT 718 PM CDT...EMERGENCY MANAGEMENT REPORTED A TORNADO.  THIS
TORNADO WAS LOCATED NEAR EOLINE...OR NEAR CENTREVILLE...MOVING
NORTHEAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  MONTEVALLO...CALERA...HELENA...ALABASTER...PELHAM...COLUMBIANA...
  CHELSEA...WEST BLOCTON...ASHBY AND BRIERFIELD IRONWORKS PARK.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 228 THROUGH 247...

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

LAT...LON 3314 8728 3314 8719 3320 8718 3323 8715
      3325 8698 3334 8686 3334 8684 3336 8683
      3337 8680 3345 8668 3314 8646 3310 8651
      3305 8652 3288 8720 3299 8726
TIME...MOT...LOC 0023Z 241DEG 38KT 3303 8713

$$

17
638 
WWUS54 KBMX 280038
SVSBMX

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

ALC007-021-117-280100-
/O.CON.KBMX.TO.W.0123.000000T0000Z-110428T0100Z/
CHILTON AL-BIBB AL-SHELBY AL-
738 PM CDT WED APR 27 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SHELBY...NORTHEASTERN BIBB
AND EXTREME NORTH CENTRAL CHILTON COUNTIES UNTIL 800 PM CDT...

...TORNADO EMERGENCY CONTINUES FOR MAYLENE...AMERICAN VILLAGE... 
SHELBY COUNTY AIRPORT AND ALABASTER...

AT 736 PM CDT...EMERGENCY MANAGEMENT REPORTED A TORNADO.  THIS
TORNADO WAS LOCATED NEAR WILTON...OR 6 MILES WEST OF MONTEVALLO...
MOVING NORTHEAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  MONTEVALLO...CALERA...HELENA...ALABASTER...PELHAM...COLUMBIANA...
  CHELSEA...WILTON...UNIVERSITY OF MONTEVALLO AND AMERICAN VILLAGE.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 228 THROUGH 247...

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

LAT...LON 3314 8646 3310 8651 3305 8652 3305 8700
      3306 8707 3317 8710 3320 8710 3325 8698
      3334 8686 3334 8684 3336 8683 3338 8678
      3345 8668
TIME...MOT...LOC 0037Z 242DEG 44KT 3312 8693

$$

17
748 
WWUS54 KBMX 280051
SVSBMX

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

ALC007-021-280101-
/O.CAN.KBMX.TO.W.0123.000000T0000Z-110428T0100Z/
CHILTON AL-BIBB AL-
751 PM CDT WED APR 27 2011

...THE TORNADO WARNING FOR NORTHEASTERN BIBB AND EXTREME NORTH
CENTRAL CHILTON COUNTIES 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 3320 8650 3309 8683 3325 8696 3334 8686
      3334 8684 3336 8683 3338 8677 3345 8668
TIME...MOT...LOC 0051Z 237DEG 45KT 3323 8675

$$

ALC117-280100-
/O.CON.KBMX.TO.W.0123.000000T0000Z-110428T0100Z/
SHELBY AL-
751 PM CDT WED APR 27 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SHELBY COUNTY UNTIL 800 PM
CDT...

...TORNADO EMERGENCY CONTINUES FOR ALABASTER...CHELSEA...

AT 750 PM CDT...A ***YOU FORGOT TO SELECT A DEFAULT OPTION***.  THIS
TORNADO WAS LOCATED NEAR ALABASTER...MOVING NORTHEAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  COLUMBIANA...CHELSEA...RIVERCHASE...VERIZON MUSIC CENTER AT OAK
  MOUNTAIN...INDIAN SPRINGS VILLAGE...OAK MOUNTAIN STATE PARK...
  HIGHLAND LAKES...MEADOWBROOK AND LAKE PURDY.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 231 THROUGH 247...

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 3320 8650 3309 8683 3325 8696 3334 8686
      3334 8684 3336 8683 3338 8677 3345 8668
TIME...MOT...LOC 0051Z 237DEG 45KT 3323 8675

$$

03

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 27, 7:17 PM CDTSevere Thunderstorm WarningBMXFayette, Marion, Walker, Winston43 min
Apr 27, 7:17 PM CDTTornado Warning EmergencyBMXCalhoun, Cherokee, Etowah43 min
Apr 27, 7:28 PM CDTTornado WarningBMXHale, Marengo, Sumter62 min
Apr 27, 7:31 PM CDTTornado WarningBMXCalhoun, Cleburne, Etowah, St. Clair, Shelby, Talladega59 min
Apr 27, 7:33 PM CDTTornado WarningBMXAutauga, Coosa, Elmore, Tallapoosa57 min
Apr 27, 7:54 PM CDTTornado WarningBMXSt. Clair, Shelby, Talladega51 min
Apr 27, 8:02 PM CDTTornado WarningBMXClay, Cleburne, Coosa, Randolph, Tallapoosa58 min
Apr 27, 8:03 PM CDTTornado WarningBMXBlount15 min
Apr 27, 8:11 PM CDTSevere Thunderstorm WarningBMXGreene, Sumter64 min
Apr 27, 8:17 PM CDTTornado WarningBMXDallas, Hale, Marengo, Perry58 min
Apr 27, 8:18 PM CDTTornado WarningBMXCalhoun, Cherokee, Cleburne42 min
Apr 27, 8:20 PM CDTTornado Warning EmergencyBMXChambers, Elmore, Lee, Tallapoosa55 min
Apr 27, 8:21 PM CDTTornado WarningBMXCalhoun, St. Clair, Talladega21 min
Apr 27, 9:00 PM CDTTornado Warning EmergencyBMXChambers60 min
Apr 27, 9:03 PM CDTSevere Thunderstorm WarningBMXCherokee42 min
Apr 27, 9:03 PM CDTTornado WarningBMXAutauga, Chilton, Dallas, Perry57 min
Apr 27, 9:36 PM CDTSevere Thunderstorm WarningBMXDallas, Hale, Marengo, Perry54 min
Apr 27, 9:37 PM CDTTornado WarningBMXChambers, Lee, Tallapoosa38 min
Apr 27, 9:46 PM CDTTornado WarningBMXChilton, Coosa, Tallapoosa37 min
Apr 27, 9:51 PM CDTSevere Thunderstorm WarningBMXCalhoun, Cherokee, Etowah39 min
Apr 27, 9:55 PM CDTAreal Flood AdvisoryBMXDallas, Marengo, Perry3 hr
Apr 27, 10:18 PM CDTSevere Thunderstorm WarningBMXLee27 min
Apr 27, 10:31 PM CDTTornado WarningBMXLee12 min
Apr 27, 10:39 PM CDTSevere Thunderstorm WarningBMXChambers, Clay, Coosa, Elmore, Randolph, Tallapoosa49 min
Apr 27, 11:15 PM CDTSevere Thunderstorm WarningBMXDallas, Lowndes45 min
Apr 27, 11:31 PM CDTSevere Thunderstorm WarningBMXAutauga, Elmore, Lowndes, Montgomery44 min
Apr 28, 12:01 AM CDTSevere Thunderstorm WarningBMXAutauga, Bullock, Elmore, Lee, Lowndes, Macon and 3 more49 min

Nearby

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