Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 263, NWS Birmingham, AL

July 31, 2012Autauga County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jul 31, 2012, 3:01 AM CDT for Autauga County, Alabama. It was in force for 74 min. 3 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
Jul 31, 2012, 3:01 AM CDT (08:01 UTC)
Expired
Jul 31, 2012, 4:15 AM CDT
In force
74 min
Issued by
NWS Birmingham, AL
Area
Storm-based polygon

County Autauga County, AL

The radar

The Birmingham radar (KBMX), 79 km from the middle of the area, began a volume at 08:00 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
Jul 31, 3:15 AM CDTTSTM WND DMG3 Sw Mountain Creek, ALTREE DOWN BLOCKING THE ROADWAY ON COUNTY ROAD 20 WEST AT THE INTERSTATE 65 OVERPASS. TIME ESTIMATED FROM RADAR.
Jul 31, 3:15 AM CDTTSTM WND DMG4 Ene Billingsley, ALTREE WAS DOWN BLOCKING THE ROADWAY NEAR THE INTERSECTION OF COUNTY ROADS 24 AND 19. TREE HAS BEEN CLEARED BY THE VFD. TIME ESTIMATED FROM RADAR.
Jul 31, 3:18 AM CDTTSTM WND DMG5 Sw Mountain Creek, ALLARGE TREE BLOCKING THE ROADWAY NEAR THE INTERSECTION OF COUNTY ROADS 57 AND 20.

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
Jul 31, 1:23 AM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 8.0 hours before the alert went out and 80 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 2012-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 771 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 2012-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.193958Sfc1 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
771 J/kg
Mixed-layer CIN
-144 J/kg
Mixed-layer LCL
1852 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
145 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.

704 
WUUS54 KBMX 310801
SVRBMX
ALC001-310915-
/O.NEW.KBMX.SV.W.0263.120731T0801Z-120731T0915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
301 AM CDT TUE JUL 31 2012

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  AUTAUGA COUNTY IN ALABAMA...

* UNTIL 415 AM CDT

* AT 300 AM CDT...THE NATIONAL WEATHER SERVICE INDICATED A LINE OF
  SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN
  EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM CLANTON TO PLECHER TO 8 MILES SOUTHWEST OF TALLADEGA NATIONAL
  FOREST...AND MOVING SOUTH AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  PRATTVILLE...BILLINGSLEY...MARBURY...VIDA JUNCTION...MULBERRY...
  BOOTH...AUTAUGAVILLE AND AUTAUGA COUNTY AIRPORT.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 186 THROUGH 193...

WINDS OF 70 TO 80 MPH WILL UPROOT TREES...DOWN POWER LINES AND CAUSE
DAMAGE TO HOMES AND STRUCTURES.

THIS IS A DANGEROUS STORM. IF YOUR ARE IN ITS PATH...PREPARE
IMMEDAITELY FOR DAMAGING WINDS AND DEADLY CLOUD TO GROUND LIGHTNING.

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 OR TWEET YOUR REPORT USING HASHTAG ALWX

LAT...LON 3242 8683 3244 8686 3254 8691 3266 8692
      3266 8672 3271 8671 3271 8641 3270 8641
      3241 8641 3241 8646 3234 8653 3237 8655
      3237 8661 3241 8662 3235 8668 3236 8671
      3241 8672 3240 8678 3233 8678 3231 8681
TIME...MOT...LOC 0801Z 343DEG 33KT 3285 8659 3275 8681
          3277 8707

$$

GRANTHAM
2 follow-up statements
217 
WWUS54 KBMX 310825
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
325 AM CDT TUE JUL 31 2012

ALC001-310915-
/O.CON.KBMX.SV.W.0263.000000T0000Z-120731T0915Z/
AUTAUGA AL-
325 AM CDT TUE JUL 31 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR AUTAUGA COUNTY
UNTIL 415 AM CDT...

AT 324 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM MARBURY TO VIDA JUNCTION TO PAUL M GRIST STATE PARK...MOVING
SOUTH AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  PRATTVILLE...BOOTH...MULBERRY...AUTAUGAVILLE...AUTAUGA COUNTY
  AIRPORT AND ROBERT F. HENRY LOCK AND DAM.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 186 THROUGH 193...

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

LAT...LON 3242 8683 3244 8686 3254 8691 3266 8692
      3266 8672 3271 8671 3271 8641 3270 8641
      3241 8641 3241 8646 3234 8653 3237 8655
      3237 8661 3241 8662 3235 8668 3236 8671
      3241 8672 3240 8678 3233 8678 3231 8681
TIME...MOT...LOC 0825Z 343DEG 33KT 3264 8643 3254 8665
          3256 8691

$$

GRANTHAM
280 
WWUS54 KBMX 310847
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
347 AM CDT TUE JUL 31 2012

ALC001-310915-
/O.CON.KBMX.SV.W.0263.000000T0000Z-120731T0915Z/
AUTAUGA AL-
347 AM CDT TUE JUL 31 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
AUTAUGA COUNTY UNTIL 415 AM CDT...

AT 344 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM MILLBROOK TO AUTAUGAVILLE TO GARDNER ISLAND...MOVING SOUTH AT 40
MPH.

LOCATIONS IMPACTED INCLUDE...
  ROBERT F. HENRY LOCK AND DAM.

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

LAT...LON 3231 8681 3242 8683 3244 8686 3253 8691
      3251 8643 3241 8641 3241 8646 3234 8653
      3237 8655 3237 8661 3241 8662 3239 8666
      3235 8668 3236 8671 3241 8672 3240 8678
      3233 8678
TIME...MOT...LOC 0847Z 343DEG 33KT 3248 8637 3238 8659
          3240 8685

$$

GRANTHAM

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 7:18 PM CDTSevere Thunderstorm WarningBMXPike27 min
Jul 30, 7:25 PM CDTAreal Flood AdvisoryBMXPike3 hr
Jul 30, 8:13 PM CDTFlash Flood WarningBMXPike3 hr
Jul 30, 11:57 PM CDTSevere Thunderstorm WarningBMXMarion78 min
Jul 31, 12:15 AM CDTSpecial Weather StatementBMXWalker, Winston45 min
Jul 31, 12:27 AM CDTSpecial Weather StatementBMXSt. Clair48 min
Jul 31, 12:32 AM CDTSevere Thunderstorm WarningBMXBlount43 min
Jul 31, 12:34 AM CDTSevere Thunderstorm WarningBMXWinston56 min
Jul 31, 12:48 AM CDTSevere Thunderstorm WarningBMXJefferson, St. Clair57 min
Jul 31, 12:57 AM CDTSevere Thunderstorm WarningBMXJefferson, Walker48 min
Jul 31, 1:01 AM CDTSevere Thunderstorm WarningBMXFayette, Walker74 min
Jul 31, 1:24 AM CDTAreal Flood AdvisoryBMXWinston2 hr
Jul 31, 1:36 AM CDTAreal Flood AdvisoryBMXJefferson, St. Clair, Shelby, Walker3 hr
Jul 31, 1:40 AM CDTSevere Thunderstorm WarningBMXJefferson, Shelby, Talladega65 min
Jul 31, 1:53 AM CDTFlash Flood WarningBMXJefferson3 hr
Jul 31, 2:10 AM CDTFlash Flood WarningBMXShelby3 hr
Jul 31, 2:20 AM CDTSevere Thunderstorm WarningBMXBibb, Chilton, Coosa70 min
Jul 31, 2:40 AM CDTSpecial Weather StatementBMXMarion, Winston65 min
Jul 31, 3:06 AM CDTSpecial Weather StatementBMXWinston24 min
Jul 31, 3:14 AM CDTSevere Thunderstorm WarningBMXElmore44 min
Jul 31, 3:20 AM CDTSevere Thunderstorm WarningBMXMarion, Walker, Winston55 min
Jul 31, 3:37 AM CDTSpecial Weather StatementBMXLowndes, Montgomery53 min
Jul 31, 4:09 AM CDTSevere Thunderstorm WarningBMXJefferson, Shelby, Walker71 min
Jul 31, 4:38 AM CDTFlash Flood WarningBMXJefferson, Shelby3 hr
Jul 31, 4:40 AM CDTSevere Thunderstorm WarningBMXChilton, Jefferson, Shelby, Walker39 min
Jul 31, 6:11 AM CDTSpecial Weather StatementBMXDallas, Hale, Perry49 min
Jul 31, 6:36 AM CDTSpecial Weather StatementBMXBlount, Etowah, St. Clair39 min
Jul 31, 7:28 AM CDTFlash Flood WarningBMXJefferson, Shelby3 hr
Jul 31, 8:32 AM CDTFlash Flood WarningBMXLowndes2 hr
Jul 31, 8:44 AM CDTSevere Thunderstorm WarningBMXJefferson, St. Clair, Shelby, Talladega, Walker46 min
Jul 31, 9:08 AM CDTSevere Thunderstorm WarningBMXChilton, Coosa, Shelby, Talladega26 min
Jul 31, 10:30 AM CDTAreal Flood WarningBMXJefferson, Shelby6 hr

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.