Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 21, NWS Birmingham, AL

February 24, 2012Dallas County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Feb 24, 2012, 9:45 AM CST for Dallas County, Alabama. It was in force for 45 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: Feb 24, 2012, 9:45 AM CST (15:45 UTC)
Expired: Feb 24, 2012, 10:30 AM CST
In force: 45 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

County Dallas County, AL

The radar

The Birmingham radar (KBMX), 102 km from the middle of the area, began a volume at 15:48 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
Feb 24, 9:50 AM CST	HAIL 1	2 Sw Crumptonia, AL	MOTH BALL TO QUARTER SIZE HAIL WAS REPORTED NEAR THE WILCOX AND DALLAS COUNTY LINE. SOME OF THE HAIL WAS COVERING THE GROUND.

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
Feb 24, 7:48 AM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 3.8 hours before the alert went out and 103 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: 1167 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 575 m above ground
0-6 km bulk shear: 80 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 195 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

217 
WUUS54 KBMX 241545
SVRBMX
ALC047-241630-
/O.NEW.KBMX.SV.W.0021.120224T1545Z-120224T1630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
945 AM CST FRI FEB 24 2012

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL DALLAS COUNTY IN SOUTH CENTRAL ALABAMA...

* UNTIL 1030 AM CST

* AT 945 AM CST...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
  WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 5 MILES
  SOUTHWEST OF REHOBOTH...OR 12 MILES NORTHWEST OF CAMDEN...AND
  MOVING NORTHEAST AT 65 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SELMONT-WEST SELMONT...SELMA...CENTRAL MILLS...FIVE POINTS...BOGUE
  CHITTO...ORRVILLE...OLD CAHABA PARK AND DALLAS LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES LEADING KILLERS. REMEMBER...
IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING.

&&

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

LAT...LON 3219 8733 3219 8736 3227 8746 3249 8719
      3249 8711 3258 8707 3233 8684 3231 8685
      3230 8683 3227 8686 3223 8681 3223 8690
      3220 8691 3209 8721
TIME...MOT...LOC 1545Z 240DEG 59KT 3214 8739

$$

19

2 follow-up statements

724 
WWUS54 KBMX 241559
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
959 AM CST FRI FEB 24 2012

ALC047-241630-
/O.CON.KBMX.SV.W.0021.000000T0000Z-120224T1630Z/
DALLAS AL-
959 AM CST FRI FEB 24 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL DALLAS
COUNTY UNTIL 1030 AM CST...

AT 959 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR FIVE
POINTS...OR 13 MILES SOUTHWEST OF SELMONT-WEST SELMONT...MOVING
NORTHEAST AT 70 MPH.

LOCATIONS IMPACTED INCLUDE...
  SELMONT-WEST SELMONT...SELMA...OLD CAHABA PARK...DALLAS LAKE...
  BELKNAP...POTTER STATION...DALLAS COUNTY HORSE ARENA...SARDIS...
  MEMORIAL STADIUM AND TYLER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS IF YOU ARE IN
THE PATH OF THIS STORM. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

&&

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

LAT...LON 3226 8730 3249 8711 3254 8709 3254 8708
      3258 8707 3233 8684 3231 8685 3230 8683
      3227 8686 3223 8681 3223 8690 3220 8691
      3211 8717
TIME...MOT...LOC 1559Z 240DEG 60KT 3226 8714

$$

19

721 
WWUS54 KBMX 241622
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1022 AM CST FRI FEB 24 2012

ALC047-241633-
/O.EXP.KBMX.SV.W.0021.000000T0000Z-120224T1630Z/
DALLAS AL-
1022 AM CST FRI FEB 24 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL DALLAS COUNTY WILL
EXPIRE AT 1030 AM CST...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

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

LAT...LON 3226 8730 3249 8711 3254 8709 3254 8708
      3258 8707 3233 8684 3231 8685 3230 8683
      3227 8686 3223 8681 3223 8690 3220 8691
      3211 8717
TIME...MOT...LOC 1623Z 240DEG 60KT 3246 8673

$$

19

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 24, 6:36 AM CST	Areal Flood Advisory	BMX	Autauga, Elmore, Tallapoosa	3 hr
Feb 24, 7:48 AM CST	Severe Thunderstorm Warning	BMX	Chambers	10 min
Feb 24, 9:03 AM CST	Severe Thunderstorm Warning	BMX	Dallas, Lowndes	42 min
Feb 24, 9:08 AM CST	Areal Flood Advisory	BMX	Autauga, Elmore, Lowndes, Montgomery, Tallapoosa	3 hr
Feb 24, 9:32 AM CST	Severe Thunderstorm Warning	BMX	Bullock, Lowndes, Macon, Montgomery	28 min
Feb 24, 9:50 AM CST	Special Weather Statement	BMX	Chambers, Tallapoosa	55 min
Feb 24, 9:53 AM CST	Severe Thunderstorm Warning	BMX	Bullock, Macon, Montgomery	37 min
Feb 24, 10:14 AM CST	Severe Thunderstorm Warning	BMX	Autauga, Dallas	31 min
Feb 24, 10:18 AM CST	Special Weather Statement	BMX	Macon	42 min
Feb 24, 10:34 AM CST	Tornado Warning	BMX	Pike	31 min
Feb 24, 10:39 AM CST	Special Weather Statement	BMX	Elmore	36 min
Feb 24, 10:59 AM CST	Special Weather Statement	BMX	Tallapoosa	31 min
Feb 24, 11:01 AM CST	Tornado Warning	BMX	Barbour, Bullock	20 min
Feb 24, 11:17 AM CST	Special Weather Statement	BMX	Randolph	28 min
Feb 24, 11:23 AM CST	Special Weather Statement	BMX	Barbour	52 min
Feb 24, 2:44 PM CST	Fire Weather Watch	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	14 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.