Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 71, NWS Birmingham, AL

March 31, 2012Winston County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 31, 2012, 4:39 PM CDT for Winston County, Alabama. It was in force for 36 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: Mar 31, 2012, 4:39 PM CDT (21:39 UTC)
Expired: Mar 31, 2012, 5:15 PM CDT
In force: 36 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

County Winston County, AL

The radar

The Columbus AFB radar (KGWX), 106 km from the middle of the area, began a volume at 21:39 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
Mar 31, 5:11 PM CDT	HAIL 1.75	Corinth Rec Area, AL	GOLF BALL SIZE HAIL REPORTED AT THE CORINTH RECREATION AREA CAUSING DAMAGE TO VEHICLES.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.7 hours before the alert went out and 109 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: 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.

323 
WUUS54 KBMX 312139
SVRBMX
ALC133-312215-
/O.NEW.KBMX.SV.W.0071.120331T2139Z-120331T2215Z/

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

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN WINSTON COUNTY IN NORTHWEST ALABAMA...

* UNTIL 515 PM CDT

* AT 434 PM CDT...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 NEAR ARLEY...AND
  MOVING SOUTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  NESMITH...HELICON...LAKE SHORE AND WILSON BEND.

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 3430 8711 3400 8711 3399 8712 3399 8714
      3400 8717 3399 8721 3400 8736 3430 8752
TIME...MOT...LOC 2140Z 295DEG 13KT 3407 8721

$$

56

1 follow-up statement

824 
WWUS54 KBMX 312156
SVSBMX

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

ALC133-312215-
/O.CON.KBMX.SV.W.0071.000000T0000Z-120331T2215Z/
WINSTON AL-
456 PM CDT SAT MAR 31 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
WINSTON COUNTY UNTIL 515 PM CDT...

AT 453 PM CDT...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
HOUSTON RECREATIONAL AREA...OR 10 MILES NORTHWEST OF ARLEY...MOVING
SOUTHEAST AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  ARLEY...INMANFIELD...CORINTH REC AREA...ADDISON...FALLS CITY...
  HELICON...NESMITH...LAKE SHORE...MCDOWELL CAMP GROUNDS AND WINSTON
  COUNTY AIRPORT.

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

LAT...LON 3400 8711 3399 8712 3399 8714 3400 8717
      3399 8721 3400 8736 3425 8744 3426 8712
TIME...MOT...LOC 2156Z 313DEG 16KT 3417 8732

$$

56

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 31, 4:27 AM CDT	Special Weather Statement	BMX	Lowndes	48 min
Mar 31, 5:18 AM CDT	Special Weather Statement	BMX	Montgomery	42 min
Mar 31, 5:27 AM CDT	Areal Flood Advisory	BMX	Lowndes, Montgomery	3 hr
Mar 31, 5:33 AM CDT	Special Weather Statement	BMX	Russell	42 min
Mar 31, 5:56 AM CDT	Dense Fog Advisory	BMX	Fayette, Lamar, Marion, Walker, Winston	3 hr
Mar 31, 6:11 AM CDT	Special Weather Statement	BMX	Bullock, Macon, Russell	49 min
Mar 31, 6:48 AM CDT	Areal Flood Advisory	BMX	Barbour, Bullock, Macon, Pike, Russell	117 min
Mar 31, 7:32 AM CDT	Flash Flood Warning	BMX	Lowndes, Montgomery	3 hr
Mar 31, 4:23 PM CDT	Special Weather Statement	BMX	Winston	37 min
Mar 31, 4:48 PM CDT	Special Weather Statement	BMX	Walker	27 min
Mar 31, 5:08 PM CDT	Severe Thunderstorm Warning	BMX	Walker, Winston	52 min
Mar 31, 5:32 PM CDT	Severe Thunderstorm Warning	BMX	Walker, Winston	43 min
Mar 31, 5:38 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Etowah	37 min
Mar 31, 5:46 PM CDT	Severe Thunderstorm Warning	BMX	Blount	44 min
Mar 31, 5:49 PM CDT	Special Weather Statement	BMX	Cherokee	26 min
Mar 31, 5:52 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Walker	38 min
Mar 31, 6:08 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Calhoun, Etowah, St. Clair	52 min
Mar 31, 6:11 PM CDT	Severe Thunderstorm Warning	BMX	Walker	49 min
Mar 31, 6:19 PM CDT	Severe Thunderstorm Warning	BMX	Winston	41 min
Mar 31, 6:35 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Walker	40 min
Mar 31, 6:37 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Clay, Cleburne, Randolph, St. Clair, Talladega	38 min
Mar 31, 6:57 PM CDT	Severe Thunderstorm Warning	BMX	Walker	33 min
Mar 31, 6:58 PM CDT	Severe Thunderstorm Warning	BMX	Winston	32 min

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.