Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 261, NWS Birmingham, AL

July 31, 2012Jefferson County, Shelby County, Talladega County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jul 31, 2012, 1:40 AM CDT for Jefferson County, Shelby County, Talladega County, Alabama. It was in force for 65 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, 1:40 AM CDT (06:40 UTC)
Expired: Jul 31, 2012, 2:45 AM CDT
In force: 65 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Jefferson County, AL, Shelby County, AL, Talladega County, AL

The radar

The Birmingham radar (KBMX), 17 km from the middle of the area, began a volume at 06:39 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.

What was reported inside it

Time	Report	Where	Remark
Jul 31, 1:50 AM CDT	TSTM WND DMG	3 N Alabaster, AL	LARGE GAS CANOPY PARTIALLY COLLAPSED AT THE JET PEP IN PELHAM. TIME ESTIMATED FROM RADAR. CORRECTED.
Jul 31, 1:50 AM CDT	NON-TSTM WND DMG	3 N Alabaster, AL	LARGE GAS CANOPY PARTIALLY COLLAPSED AT THE JET PEP IN PELHAM. TIME ESTIMATED FROM RADAR.
Jul 31, 2:15 AM CDT	TSTM WND DMG	Saginaw, AL	LARGE TREE LIMBS AND TREE TOPS SNAPPED ALONG CR 339 BETWEEN CR 340 AND CR 26. TREE DOWN ON CAR. TIME ESTIMATED BY RADAR.

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.

Issued	Product	Office	Lasted
Jul 31, 1:23 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 6.7 hours before the alert went out and 17 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: 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.

014 
WUUS54 KBMX 310640
SVRBMX
ALC073-117-121-310745-
/O.NEW.KBMX.SV.W.0261.120731T0640Z-120731T0745Z/

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

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JEFFERSON COUNTY IN ALABAMA...
  SHELBY COUNTY IN ALABAMA...
  SOUTHWESTERN TALLADEGA COUNTY IN EAST CENTRAL ALABAMA...

* UNTIL 245 AM CDT

* AT 139 AM CDT...THE NATIONAL WEATHER SERVICE INDICATED A LINE OF
  SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM GORGAS STEAM PLANT TO 5 MILES NORTHEAST
  OF FAYETTEVILLE...AND MOVING SOUTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CHELSEA...WILSONVILLE...SYLACAUGA...HOOVER...HUEYTOWN...PELHAM...
  BESSEMER AND TALLADEGA SPRINGS.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 228 THROUGH 272...
INTERSTATE 459 EXIT NUMBERS 1 THROUGH 32...
US 78 EXIT NUMBERS 81 THROUGH 91...
INTERSTATE 20 EXIT NUMBERS 104 THROUGH 140...
INTERSTATE 59 EXIT NUMBERS 130 THROUGH 137...

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 3345 8638 3340 8638 3343 8634 3319 8612
      3319 8617 3310 8618 3310 8649 3302 8655
      3307 8662 3305 8689 3316 8697 3317 8702
      3324 8703 3332 8718 3347 8734 3348 8729
      3355 8719 3360 8720 3366 8706 3378 8700
TIME...MOT...LOC 0640Z 333DEG 28KT 3362 8722 3320 8635

$$

GRANTHAM

4 follow-up statements

276 
WWUS54 KBMX 310659
SVSBMX

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

ALC073-117-121-310745-
/O.CON.KBMX.SV.W.0261.000000T0000Z-120731T0745Z/
JEFFERSON AL-SHELBY AL-TALLADEGA AL-
159 AM CDT TUE JUL 31 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
TALLADEGA...SHELBY AND JEFFERSON COUNTIES UNTIL 245 AM CDT...

AT 158 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 5 MILES NORTHWEST OF OAK GROVE TO
TALLADEGA SPRINGS...MOVING SOUTHEAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  COLUMBIANA...SYLACAUGA...HELENA...ALABASTER...CALERA...
  MONTEVALLO...WOODSTOCK...NORTH JOHNS...SHELBY COUNTY AIRPORT AND
  MAYLENE.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 228 THROUGH 272...
INTERSTATE 459 EXIT NUMBERS 1 THROUGH 32...
US 78 EXIT NUMBERS 81 THROUGH 91...
INTERSTATE 20 EXIT NUMBERS 104 THROUGH 140...
INTERSTATE 59 EXIT NUMBERS 130 THROUGH 134...

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

LAT...LON 3345 8638 3340 8638 3343 8634 3319 8612
      3319 8617 3310 8618 3310 8649 3302 8655
      3307 8662 3305 8689 3316 8697 3317 8702
      3324 8703 3332 8718 3347 8734 3348 8729
      3355 8719 3360 8720 3366 8706 3378 8700
TIME...MOT...LOC 0659Z 335DEG 37KT 3345 8718 3311 8645

$$

GRANTHAM

824 
WWUS54 KBMX 310708
SVSBMX

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

ALC073-117-121-310745-
/O.CON.KBMX.SV.W.0261.000000T0000Z-120731T0745Z/
JEFFERSON AL-SHELBY AL-TALLADEGA AL-
208 AM CDT TUE JUL 31 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
TALLADEGA...SHELBY AND SOUTHERN JEFFERSON COUNTIES UNTIL 245 AM
CDT...

AT 205 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM HUEYTOWN TO BLUE SPRINGS...MOVING
SOUTHEAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  ALABASTER...CALERA...MONTEVALLO...SHELBY COUNTY AIRPORT...
  MAYLENE...AMERICAN VILLAGE...UNIVERSITY OF MONTEVALLO...WILTON...
  WELLER AND BESSEMER AIRPORT.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 228 THROUGH 261...
INTERSTATE 459 EXIT NUMBERS 1 THROUGH 19...
INTERSTATE 20 EXIT NUMBERS 104 THROUGH 125...

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

LAT...LON 3320 8613 3319 8617 3310 8618 3310 8649
      3302 8655 3307 8663 3307 8688 3305 8689
      3316 8697 3317 8702 3325 8703 3332 8718
      3342 8725 3347 8734 3348 8728 3355 8719
      3359 8720 3361 8717 3366 8705
TIME...MOT...LOC 0708Z 335DEG 37KT 3340 8704 3309 8650

$$

GRANTHAM

420 
WWUS54 KBMX 310723
SVSBMX

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

ALC073-117-121-310745-
/O.CON.KBMX.SV.W.0261.000000T0000Z-120731T0745Z/
JEFFERSON AL-SHELBY AL-TALLADEGA AL-
223 AM CDT TUE JUL 31 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
TALLADEGA...SOUTHERN SHELBY AND SOUTHERN JEFFERSON COUNTIES UNTIL 245
AM CDT...

AT 218 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM OAK GROVE TO MAYLENE TO
FAYETTEVILLE...MOVING SOUTHEAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  CALERA...MONTEVALLO...AMERICAN VILLAGE...UNIVERSITY OF
  MONTEVALLO...WILTON...SPRING CREEK AT LAY LAKE...AL 145 AND CR
  46...DOGWOOD...WAXAHATCHEE AT LAY LAKE AND WELLER.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 228 THROUGH 247...
INTERSTATE 459 EXIT NUMBERS 1 THROUGH 10...
INTERSTATE 20 EXIT NUMBERS 104 THROUGH 113...

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

LAT...LON 3348 8728 3355 8719 3311 8619 3310 8649
      3302 8655 3307 8662 3307 8688 3305 8689
      3316 8697 3317 8702 3325 8703 3332 8718
      3342 8725 3347 8733
TIME...MOT...LOC 0723Z 335DEG 37KT 3342 8718 3315 8682
          3310 8638

$$

GRANTHAM

900 
WWUS54 KBMX 310736 RRA
SVSBMX

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

ALC073-117-121-310745-
/O.CON.KBMX.SV.W.0261.000000T0000Z-120731T0745Z/
JEFFERSON AL-SHELBY AL-TALLADEGA AL-
236 AM CDT TUE JUL 31 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
TALLADEGA...SOUTHERN SHELBY AND SOUTHERN JEFFERSON COUNTIES UNTIL 245
AM CDT...

AT 235 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM NORTH JOHNS TO CALERA TO
WEOGUFKA...MOVING SOUTHEAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  MONTEVALLO...UNIVERSITY OF MONTEVALLO AND WILTON.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 228 THROUGH 247...
INTERSTATE 459 EXIT NUMBERS 1 THROUGH 13...
INTERSTATE 20 EXIT NUMBERS 104 THROUGH 113...

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

LAT...LON 3348 8728 3355 8719 3311 8619 3310 8649
      3302 8655 3307 8662 3307 8688 3305 8689
      3316 8697 3317 8702 3325 8703 3332 8718
      3342 8725 3347 8733
TIME...MOT...LOC 0736Z 335DEG 37KT 3330 8711 3303 8675
          3298 8631

$$

GRANTHAM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 7:18 PM CDT	Severe Thunderstorm Warning	BMX	Pike	27 min
Jul 30, 7:25 PM CDT	Areal Flood Advisory	BMX	Pike	3 hr
Jul 30, 8:13 PM CDT	Flash Flood Warning	BMX	Pike	3 hr
Jul 30, 11:57 PM CDT	Severe Thunderstorm Warning	BMX	Marion	78 min
Jul 31, 12:15 AM CDT	Special Weather Statement	BMX	Walker, Winston	45 min
Jul 31, 12:27 AM CDT	Special Weather Statement	BMX	St. Clair	48 min
Jul 31, 12:32 AM CDT	Severe Thunderstorm Warning	BMX	Blount	43 min
Jul 31, 12:34 AM CDT	Severe Thunderstorm Warning	BMX	Winston	56 min
Jul 31, 12:48 AM CDT	Severe Thunderstorm Warning	BMX	Jefferson, St. Clair	57 min
Jul 31, 12:57 AM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Walker	48 min
Jul 31, 1:01 AM CDT	Severe Thunderstorm Warning	BMX	Fayette, Walker	74 min
Jul 31, 1:24 AM CDT	Areal Flood Advisory	BMX	Winston	2 hr
Jul 31, 1:36 AM CDT	Areal Flood Advisory	BMX	Jefferson, St. Clair, Shelby, Walker	3 hr
Jul 31, 1:53 AM CDT	Flash Flood Warning	BMX	Jefferson	3 hr
Jul 31, 2:10 AM CDT	Flash Flood Warning	BMX	Shelby	3 hr
Jul 31, 2:20 AM CDT	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Coosa	70 min
Jul 31, 2:40 AM CDT	Special Weather Statement	BMX	Marion, Winston	65 min
Jul 31, 3:01 AM CDT	Severe Thunderstorm Warning	BMX	Autauga	74 min
Jul 31, 3:06 AM CDT	Special Weather Statement	BMX	Winston	24 min
Jul 31, 3:14 AM CDT	Severe Thunderstorm Warning	BMX	Elmore	44 min
Jul 31, 3:20 AM CDT	Severe Thunderstorm Warning	BMX	Marion, Walker, Winston	55 min
Jul 31, 3:37 AM CDT	Special Weather Statement	BMX	Lowndes, Montgomery	53 min
Jul 31, 4:09 AM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Shelby, Walker	71 min
Jul 31, 4:38 AM CDT	Flash Flood Warning	BMX	Jefferson, Shelby	3 hr
Jul 31, 4:40 AM CDT	Severe Thunderstorm Warning	BMX	Chilton, Jefferson, Shelby, Walker	39 min
Jul 31, 6:11 AM CDT	Special Weather Statement	BMX	Dallas, Hale, Perry	49 min
Jul 31, 6:36 AM CDT	Special Weather Statement	BMX	Blount, Etowah, St. Clair	39 min
Jul 31, 7:28 AM CDT	Flash Flood Warning	BMX	Jefferson, Shelby	3 hr
Jul 31, 8:32 AM CDT	Flash Flood Warning	BMX	Lowndes	2 hr
Jul 31, 8:44 AM CDT	Severe Thunderstorm Warning	BMX	Jefferson, St. Clair, Shelby, Talladega, Walker	46 min
Jul 31, 9:08 AM CDT	Severe Thunderstorm Warning	BMX	Chilton, Coosa, Shelby, Talladega	26 min
Jul 31, 10:30 AM CDT	Areal Flood Warning	BMX	Jefferson, Shelby	6 hr

Nearby

Severe Thunderstorm Warnings in Alabama, 2012 Every 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.