Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 31, NWS Birmingham, AL

February 28, 2011Clay County, Randolph County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Feb 28, 2011, 4:43 PM CST for Clay County, Randolph County, Alabama. It was in force for 17 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Feb 28, 2011, 4:43 PM CST (22:43 UTC)
Expired: Feb 28, 2011, 5:00 PM CST
In force: 17 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Clay County, AL, Randolph County, AL

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 28, 12:29 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.7 hours before the alert went out and 93 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1162 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 229 m²/s²
0-3 km storm-relative helicity: 350 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

118 
WUUS54 KBMX 282243
SVRBMX
ALC027-111-282330-
/O.NEW.KBMX.SV.W.0031.110228T2243Z-110228T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
443 PM CST MON FEB 28 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL CLAY COUNTY IN EAST CENTRAL ALABAMA...
  SOUTHERN RANDOLPH COUNTY IN EAST CENTRAL ALABAMA...

* UNTIL 530 PM CST

* AT 443 PM CST...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
  MPH.  THIS STORM WAS LOCATED NEAR ASHLAND...AND MOVING EAST AT 35
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  WEDOWEE...ROANOKE...MALONE...CORINTH...CRYSTAL LAKE...CRAGFORD...
  R.L. HARRIS DAM AND OFELIA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM CST MONDAY EVENING FOR
SOUTHERN ALABAMA.

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

LAT...LON 3313 8523 3318 8586 3334 8586 3337 8528
TIME...MOT...LOC 2243Z 272DEG 32KT 3327 8574

$$

27

1 follow-up statement

526 
WWUS54 KBMX 282300
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
500 PM CST MON FEB 28 2011

ALC027-111-282310-
/O.CAN.KBMX.SV.W.0031.000000T0000Z-110228T2330Z/
CLAY AL-RANDOLPH AL-
500 PM CST MON FEB 28 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN RANDOLPH AND EAST
CENTRAL CLAY COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 7 PM.

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

LAT...LON 3313 8523 3318 8586 3334 8586 3337 8528
TIME...MOT...LOC 2300Z 272DEG 32KT 3326 8556

$$

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 1:53 PM CST	Special Weather Statement	BMX	Marshall	37 min
Feb 28, 2:11 PM CST	Severe Thunderstorm Warning	BMX	Cherokee	34 min
Feb 28, 2:19 PM CST	Special Weather Statement	BMX	Jefferson, Tuscaloosa	41 min
Feb 28, 2:21 PM CST	Severe Thunderstorm Warning	BMX	Cherokee, Etowah	24 min
Feb 28, 2:32 PM CST	Severe Thunderstorm Warning	BMX	Jefferson, Tuscaloosa	43 min
Feb 28, 2:44 PM CST	Severe Thunderstorm Warning	BMX	Cherokee	19 min
Feb 28, 2:58 PM CST	Tornado Warning	BMX	Barbour, Bullock, Pike	15 min
Feb 28, 2:59 PM CST	Severe Thunderstorm Warning	BMX	Bibb, Shelby	61 min
Feb 28, 3:09 PM CST	Severe Thunderstorm Warning	BMX	Calhoun, St. Clair, Talladega	51 min
Feb 28, 3:15 PM CST	Special Weather Statement	BMX	Cherokee	15 min
Feb 28, 3:39 PM CST	Tornado Warning	BMX	Shelby, Talladega	36 min
Feb 28, 3:53 PM CST	Severe Thunderstorm Warning	BMX	Cleburne	37 min
Feb 28, 4:00 PM CST	Severe Thunderstorm Warning	BMX	Clay, Coosa, Randolph, Talladega, Tallapoosa	45 min
Feb 28, 4:16 PM CST	Severe Thunderstorm Warning	BMX	Autauga, Chilton, Dallas	44 min
Feb 28, 4:22 PM CST	Severe Thunderstorm Warning	BMX	Autauga, Dallas, Perry	38 min
Feb 28, 4:47 PM CST	Severe Thunderstorm Warning	BMX	Autauga, Dallas, Lowndes	43 min
Feb 28, 5:11 PM CST	Special Weather Statement	BMX	Chambers	49 min
Feb 28, 5:15 PM CST	Severe Thunderstorm Warning	BMX	Dallas, Lowndes, Montgomery	45 min
Feb 28, 5:29 PM CST	Tornado Warning	BMX	Chambers	23 min
Feb 28, 5:56 PM CST	Severe Thunderstorm Warning	BMX	Bullock, Montgomery	49 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2011 Every severe thunderstorm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.