Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 77, NWS Birmingham, AL

March 31, 20124 counties in Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 31, 2012, 6:08 PM CDT for 4 counties in Alabama. It was in force for 52 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
Mar 31, 2012, 6:08 PM CDT (23:08 UTC)
Expired
Mar 31, 2012, 7:00 PM CDT
In force
52 min
Issued by
NWS Birmingham, AL
Area
Storm-based polygon

Counties Blount County, AL, Calhoun County, AL, Etowah County, AL, St. Clair County, AL

The radar

The Birmingham radar (KBMX), 100 km from the middle of the area, began a volume at 23:11 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
Mar 31, 6:10 PM CDTHAIL 1Altoona, ALQUARTER SIZED HAIL IN ALTOONA.
Mar 31, 6:29 PM CDTHAIL 12 Ne Oneonta, ALQUARTER SIZED HAIL ON COUNTY ROAD 39. CORRECTED.
Mar 31, 6:29 PM CDTHAIL 13 N Oneonta, ALQUARTER SIZED HAIL ON COUNTY ROAD 39.
Mar 31, 6:35 PM CDTHAIL 0.57 Ese Oneonta, ALHALF INCH HAIL REPORTED SOUTHEAST OF ONEONTA.
Mar 31, 6:39 PM CDTHAIL 0.25Jacksonville, ALPEA SIZE HAIL AND 50 MPH WINDS IN JACKSONVILLE.

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
Mar 31, 5:04 PM CDTSevere Thunderstorm WatchSPC3 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 11.1 hours before the alert went out and 100 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 2012-03-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1095 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 2012-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 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
1095 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
580 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
36 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

027 
WUUS54 KBMX 312308
SVRBMX
ALC009-015-055-115-010000-
/O.NEW.KBMX.SV.W.0077.120331T2308Z-120401T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
608 PM CDT SAT MAR 31 2012

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN BLOUNT COUNTY IN ALABAMA...
  NORTHERN CALHOUN COUNTY IN EAST CENTRAL ALABAMA...
  SOUTHERN ETOWAH COUNTY IN NORTHEAST ALABAMA...
  NORTHERN ST. CLAIR COUNTY IN ALABAMA...

* UNTIL 700 PM CDT

* AT 604 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A LINE OF
  SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM BLOUNTSVILLE TO ALTOONA TO HOKES
  BLUFF...AND MOVING SOUTH AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RAINBOW CITY...CLEVELAND...ONEONTA...JACKSONVILLE...SPRINGVILLE...
  SAKS...FORT MCCLELLAN AND GLENCOE.

THIS INCLUDES...
INTERSTATE 59 EXIT NUMBERS 154 THROUGH 183...

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 3420 8653 3407 8630 3402 8577 3370 8566
      3371 8636 3383 8664
TIME...MOT...LOC 2309Z 008DEG 12KT 3406 8655 3398 8631
          3397 8584

$$

GRANTHAM
2 follow-up statements
089 
WWUS54 KBMX 312325
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
625 PM CDT SAT MAR 31 2012

ALC009-015-055-115-010000-
/O.CON.KBMX.SV.W.0077.000000T0000Z-120401T0000Z/
CALHOUN AL-BLOUNT AL-ETOWAH AL-ST. CLAIR AL-
625 PM CDT SAT MAR 31 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN ST.
CLAIR...SOUTHERN ETOWAH...EASTERN BLOUNT AND NORTHERN CALHOUN
COUNTIES UNTIL 700 PM CDT...

AT 610 PM CDT...LOCAL LAW ENFORCEMENT REPORTED QUARTED SIZE HAIL IN 
ALTOONA. THESE THUNDERSTORMS MAY ALSO PRODUCE DAMAGING WINDS IN 
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING 
FROM ROSA TO 7 MILES NORTHWEST OF ASHVILLE TO ALEXANDRIA...MOVING 
SOUTH AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  JACKSONVILLE...ONEONTA...CLEVELAND...FORT MCCLELLAN...SAKS...
  SPRINGVILLE...ROSA...ASHVILLE...ALEXANDRIA AND OHATCHEE.

THIS INCLUDES...
INTERSTATE 59 EXIT NUMBERS 154 THROUGH 183...

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

LAT...LON 3420 8653 3407 8630 3402 8577 3370 8566
      3371 8636 3383 8664
TIME...MOT...LOC 2324Z 008DEG 12KT 3405 8652 3389 8636
          3382 8584

$$

GRANTHAM
678 
WWUS54 KBMX 312332
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
632 PM CDT SAT MAR 31 2012

ALC009-015-055-115-010000-
/O.CON.KBMX.SV.W.0077.000000T0000Z-120401T0000Z/
CALHOUN AL-BLOUNT AL-ETOWAH AL-ST. CLAIR AL-
632 PM CDT SAT MAR 31 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN ST.
CLAIR...SOUTHWESTERN ETOWAH...EASTERN BLOUNT AND NORTHERN CALHOUN
COUNTIES UNTIL 700 PM CDT...

AT 628 PM CDT...TRAINED WEATHER SPOTTERS REPORTED QUARTER SIZE HAIL 
NEAR ONEONTA. THESE THUNDERSTORMS MAY ALSO PRODUCE DAMAGING WINDS 
IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE 
EXTENDING FROM ROSA TO 6 MILES SOUTHEAST OF ONEONTA TO ALEXANDRIA TO 
JACKSONVILLE...MOVING SOUTH AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  JACKSONVILLE...CLEVELAND...SAKS...FORT MCCLELLAN...SPRINGVILLE...
  ASHVILLE...ALEXANDRIA...OHATCHEE...FAIRVIEW AND WEAVER.

THIS INCLUDES...
INTERSTATE 59 EXIT NUMBERS 154 THROUGH 174...

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

LAT...LON 3410 8655 3398 8632 3392 8574 3370 8566
      3371 8636 3383 8664
TIME...MOT...LOC 2332Z 001DEG 18KT 3401 8654 3387 8638
          3379 8592 3384 8572

$$

GRANTHAM

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 31, 4:27 AM CDTSpecial Weather StatementBMXLowndes48 min
Mar 31, 5:18 AM CDTSpecial Weather StatementBMXMontgomery42 min
Mar 31, 5:27 AM CDTAreal Flood AdvisoryBMXLowndes, Montgomery3 hr
Mar 31, 5:33 AM CDTSpecial Weather StatementBMXRussell42 min
Mar 31, 5:56 AM CDTDense Fog AdvisoryBMXFayette, Lamar, Marion, Walker, Winston3 hr
Mar 31, 6:11 AM CDTSpecial Weather StatementBMXBullock, Macon, Russell49 min
Mar 31, 6:48 AM CDTAreal Flood AdvisoryBMXBarbour, Bullock, Macon, Pike, Russell117 min
Mar 31, 7:32 AM CDTFlash Flood WarningBMXLowndes, Montgomery3 hr
Mar 31, 4:23 PM CDTSpecial Weather StatementBMXWinston37 min
Mar 31, 4:39 PM CDTSevere Thunderstorm WarningBMXWinston36 min
Mar 31, 4:48 PM CDTSpecial Weather StatementBMXWalker27 min
Mar 31, 5:08 PM CDTSevere Thunderstorm WarningBMXWalker, Winston52 min
Mar 31, 5:32 PM CDTSevere Thunderstorm WarningBMXWalker, Winston43 min
Mar 31, 5:38 PM CDTSevere Thunderstorm WarningBMXBlount, Etowah37 min
Mar 31, 5:46 PM CDTSevere Thunderstorm WarningBMXBlount44 min
Mar 31, 5:49 PM CDTSpecial Weather StatementBMXCherokee26 min
Mar 31, 5:52 PM CDTSevere Thunderstorm WarningBMXJefferson, Walker38 min
Mar 31, 6:11 PM CDTSevere Thunderstorm WarningBMXWalker49 min
Mar 31, 6:19 PM CDTSevere Thunderstorm WarningBMXWinston41 min
Mar 31, 6:35 PM CDTSevere Thunderstorm WarningBMXJefferson, Walker40 min
Mar 31, 6:37 PM CDTSevere Thunderstorm WarningBMXCalhoun, Clay, Cleburne, Randolph, St. Clair, Talladega38 min
Mar 31, 6:57 PM CDTSevere Thunderstorm WarningBMXWalker33 min
Mar 31, 6:58 PM CDTSevere Thunderstorm WarningBMXWinston32 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.