Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 104, NWS Birmingham, AL

April 5, 2012Bibb County, Chilton County, Shelby County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 5, 2012, 6:33 PM CDT for Bibb County, Chilton County, Shelby County, Alabama. It was in force for 42 min. 5 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 5, 2012, 6:33 PM CDT (23:33 UTC)
Expired
Apr 5, 2012, 7:15 PM CDT
In force
42 min
Issued by
NWS Birmingham, AL
Area
Storm-based polygon

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

The radar

The Birmingham radar (KBMX), 21 km from the middle of the area, began a volume at 23:33 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 5, 6:47 PM CDTHAIL 1.253 W Jemison, ALHALF DOLLAR SIZE HAIL JUST WEST OF JEMISON ON COUNTY RD 42.
Apr 5, 6:55 PM CDTHAIL 0.5N Calera, ALNWS BMX
Apr 5, 6:56 PM CDTHAIL 1Jemison, ALQUARTER HAIL AND WINDS ESTIMATED AT 60 MPH NEAR INTERSTATE 65 AT EXIT 219.
Apr 5, 6:59 PM CDTHAIL 1Calera, ALQUARTER HAIL IN AND AROUND CALERA.
Apr 5, 7:14 PM CDTHAIL 1Jemison, ALQUARTER HAIL AND WINDS ESTIMATED AT 60 MPH NEAR INTERSTATE 65 AT EXIT 219.

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 5, 6:14 PM CDTSevere Thunderstorm WatchSPC3 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 11.6 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 12:00Z on 2012-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 315 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 12:00Z on 2012-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -91 square meters per square second.19395878Sfc1 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
315 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
754 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
-91 m²/s²
0-3 km storm-relative helicity
-43 m²/s²
Significant tornado parameter
0.0
Supercell composite
-1.5

Open this sounding in Storm Lab

The text

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

617 
WUUS54 KBMX 052333
SVRBMX
ALC007-021-117-060015-
/O.NEW.KBMX.SV.W.0104.120405T2333Z-120406T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
633 PM CDT THU APR 5 2012

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL BIBB COUNTY IN ALABAMA...
  NORTHERN CHILTON COUNTY IN ALABAMA...
  SOUTH CENTRAL SHELBY COUNTY IN ALABAMA...

* UNTIL 715 PM CDT

* AT 629 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  TALLADEGA NATIONAL FOREST...OR 9 MILES EAST OF CENTREVILLE...AND
  MOVING EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  JEMISON...ASHBY...THORSBY...UNION GROVE...LAY LAKE DAM...
  RANDOLPH...CAMPBELL AND MINOOKA PARK.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 219 THROUGH 228...

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 3320 8651 3312 8648 3309 8651 3306 8651
      3306 8652 3301 8652 3299 8651 3294 8652
      3287 8699 3299 8703
TIME...MOT...LOC 2333Z 253DEG 25KT 3294 8694

$$

GRANTHAM
3 follow-up statements
626 
WWUS54 KBMX 052343
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
643 PM CDT THU APR 5 2012

ALC007-021-117-060015-
/O.CON.KBMX.SV.W.0104.000000T0000Z-120406T0015Z/
BIBB AL-CHILTON AL-SHELBY AL-
643 PM CDT THU APR 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL
SHELBY...NORTHERN CHILTON AND EAST CENTRAL BIBB COUNTIES UNTIL 715 PM
CDT...

AT 638 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 5 MILES
SOUTH OF ASHBY...OR 9 MILES WEST OF JEMISON...MOVING EAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  JEMISON...THORSBY...UNION GROVE...LAY LAKE DAM...MINOOKA PARK...
  WAXAHATCHEE AT LAY LAKE...AL 145 AND CR 46...SPRING CREEK AT LAY
  LAKE AND SHELBY.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBER 219...

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

LAT...LON 3320 8651 3312 8648 3309 8651 3307 8651
      3305 8652 3301 8652 3299 8651 3294 8652
      3288 8693 3300 8694
TIME...MOT...LOC 2343Z 253DEG 25KT 3296 8686

$$

GRANTHAM
434 
WWUS54 KBMX 052349
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
649 PM CDT THU APR 5 2012

ALC007-060000-
/O.CAN.KBMX.SV.W.0104.000000T0000Z-120406T0015Z/
BIBB AL-
649 PM CDT THU APR 5 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BIBB 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 3302 8686 3320 8651 3312 8648 3309 8651
      3305 8652 3301 8652 3299 8651 3294 8652
      3291 8684
TIME...MOT...LOC 2350Z 253DEG 25KT 3297 8680

$$

ALC021-117-060015-
/O.CON.KBMX.SV.W.0104.000000T0000Z-120406T0015Z/
CHILTON AL-SHELBY AL-
649 PM CDT THU APR 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL
SHELBY AND NORTH CENTRAL CHILTON COUNTIES UNTIL 715 PM CDT...

AT 647 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
JEMISON...MOVING EAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  JEMISON...UNION GROVE...LAY LAKE DAM...MINOOKA PARK...WAXAHATCHEE
  AT LAY LAKE...AL 145 AND CR 46...SPRING CREEK AT LAY LAKE AND
  SHELBY.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBER 219...

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

LAT...LON 3302 8686 3320 8651 3312 8648 3309 8651
      3305 8652 3301 8652 3299 8651 3294 8652
      3291 8684
TIME...MOT...LOC 2350Z 253DEG 25KT 3297 8680

$$

GRANTHAM
099 
WWUS54 KBMX 060002
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
702 PM CDT THU APR 5 2012

ALC021-117-060015-
/O.CON.KBMX.SV.W.0104.000000T0000Z-120406T0015Z/
CHILTON AL-SHELBY AL-
702 PM CDT THU APR 5 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL
SHELBY AND NORTH CENTRAL CHILTON COUNTIES UNTIL 715 PM CDT...

AT 701 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
UNION GROVE...OR NEAR JEMISON...MOVING EAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  LAY LAKE DAM...WAXAHATCHEE AT LAY LAKE...AL 145 AND CR 46...SPRING
  CREEK AT LAY LAKE AND SHELBY.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBER 219...

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

LAT...LON 3302 8686 3320 8651 3312 8648 3309 8651
      3305 8652 3301 8652 3299 8651 3294 8652
      3291 8684
TIME...MOT...LOC 0002Z 253DEG 25KT 3301 8669

$$

GRANTHAM

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 5, 9:41 AM CDTSevere Thunderstorm WarningBMXGreene, Pickens, Sumter64 min
Apr 5, 10:26 AM CDTSevere Thunderstorm WarningBMXGreene, Hale, Tuscaloosa64 min
Apr 5, 11:07 AM CDTSevere Thunderstorm WarningBMXBibb, Perry53 min
Apr 5, 11:27 AM CDTSpecial Weather StatementBMXMarengo48 min
Apr 5, 11:44 AM CDTSevere Thunderstorm WarningBMXDallas, Marengo46 min
Apr 5, 12:03 PM CDTSpecial Weather StatementBMXChilton, Shelby57 min
Apr 5, 12:21 PM CDTSpecial Weather StatementBMXAutauga, Lowndes54 min
Apr 5, 12:28 PM CDTSpecial Weather StatementBMXDallas32 min
Apr 5, 12:49 PM CDTSpecial Weather StatementBMXCoosa, Elmore56 min
Apr 5, 12:56 PM CDTSpecial Weather StatementBMXMontgomery64 min
Apr 5, 3:56 PM CDTSpecial Weather StatementBMXMarion49 min
Apr 5, 4:17 PM CDTSevere Thunderstorm WarningBMXLamar28 min
Apr 5, 4:41 PM CDTSevere Thunderstorm WarningBMXFayette, Lamar, Marion49 min
Apr 5, 4:52 PM CDTSpecial Weather StatementBMXPickens38 min
Apr 5, 5:09 PM CDTSevere Thunderstorm WarningBMXMarion, Walker, Winston66 min
Apr 5, 5:24 PM CDTSpecial Weather StatementBMXHale51 min
Apr 5, 5:36 PM CDTSpecial Weather StatementBMXTuscaloosa39 min
Apr 5, 5:38 PM CDTSevere Thunderstorm WarningBMXWalker52 min
Apr 5, 5:59 PM CDTSpecial Weather StatementBMXJefferson46 min
Apr 5, 6:06 PM CDTSevere Thunderstorm WarningBMXJefferson39 min
Apr 5, 6:09 PM CDTSpecial Weather StatementBMXDallas51 min
Apr 5, 6:14 PM CDTSpecial Weather StatementBMXBlount46 min
Apr 5, 6:18 PM CDTSpecial Weather StatementBMXChilton42 min
Apr 5, 6:25 PM CDTSpecial Weather StatementBMXBibb65 min
Apr 5, 6:27 PM CDTSevere Thunderstorm WarningBMXAutauga, Dallas, Lowndes48 min
Apr 5, 6:28 PM CDTSpecial Weather StatementBMXShelby47 min
Apr 5, 6:37 PM CDTSevere Thunderstorm WarningBMXAutauga, Chilton, Dallas, Elmore, Perry53 min
Apr 5, 6:43 PM CDTSevere Thunderstorm WarningBMXJefferson, St. Clair, Shelby47 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2012Every severe thunderstorm warning in 2012

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.