Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 95, NWS Birmingham, AL

March 28, 2011Shelby County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 28, 2011, 1:44 AM CDT for Shelby County, Alabama. It was in force for 28 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 28, 2011, 1:44 AM CDT (06:44 UTC)
Expired: Mar 28, 2011, 2:12 AM CDT
In force: 28 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

County Shelby County, AL

The radar

The Birmingham radar (KBMX), 23 km from the middle of the area, began a volume at 06:46 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 28, 1:47 AM CDT	HAIL 0.88	Maylene, AL	AT STERLING GATE SUBDIVISION

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 00:00Z, 6.7 hours before the alert went out and 23 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: 652 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

185 
WUUS54 KBMX 280644
SVRBMX
ALC117-280730-
/O.NEW.KBMX.SV.W.0095.110328T0644Z-110328T0730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
144 AM CDT MON MAR 28 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL SHELBY COUNTY IN CENTRAL ALABAMA...

* UNTIL 230 AM CDT

* AT 142 AM 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 MAYLENE...
  OR NEAR ALABASTER...AND MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HELENA...ALABASTER...PELHAM...CHELSEA...WILSONVILLE...SHELBY COUNTY
  AIRPORT...VERIZON MUSIC CENTER AT OAK MOUNTAIN AND INDIAN SPRINGS
  VILLAGE.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 234 THROUGH 247...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DAMAGING WINDS. 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 3340 8638 3337 8635 3335 8637 3330 8636
      3328 8644 3326 8643 3324 8646 3321 8647
      3319 8650 3313 8694 3327 8697 3328 8693
      3332 8689 3333 8690 3344 8638
TIME...MOT...LOC 0644Z 258DEG 38KT 3324 8685

$$

27

2 follow-up statements

130 
WWUS54 KBMX 280656
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
156 AM CDT MON MAR 28 2011

ALC117-280730-
/O.CON.KBMX.SV.W.0095.000000T0000Z-110328T0730Z/
SHELBY AL-
156 AM CDT MON MAR 28 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN SHELBY
COUNTY UNTIL 230 AM CDT...

AT 151 AM 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
ALABASTER...MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  CHELSEA...WILSONVILLE...WESTOVER...HARPERSVILLE...VINCENT...BEESWAX
  AT LAY LAKE AND GASTON STEAM PLANT.

THIS INCLUDES...
INTERSTATE 65 EXIT NUMBERS 246 THROUGH 247...

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 3344 8638 3340 8638 3337 8635 3335 8637
      3330 8636 3328 8644 3326 8643 3324 8646
      3321 8647 3319 8650 3316 8676 3336 8679
TIME...MOT...LOC 0656Z 258DEG 38KT 3326 8670

$$

27

987 
WWUS54 KBMX 280712
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
212 AM CDT MON MAR 28 2011

ALC117-280723-
/O.CAN.KBMX.SV.W.0095.000000T0000Z-110328T0730Z/
SHELBY AL-
212 AM CDT MON MAR 28 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN SHELBY COUNTY IS
CANCELLED...

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

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

LAT...LON 3344 8638 3340 8638 3337 8635 3335 8637
      3330 8636 3328 8644 3326 8643 3324 8646
      3321 8647 3319 8650 3316 8676 3336 8679
TIME...MOT...LOC 0713Z 258DEG 38KT 3330 8649

$$

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 27, 7:03 PM CDT	Special Weather Statement	BMX	Barbour	42 min
Mar 27, 8:32 PM CDT	Special Weather Statement	BMX	Montgomery	43 min
Mar 27, 8:51 PM CDT	Special Weather Statement	BMX	Fayette, Lamar	39 min
Mar 27, 9:05 PM CDT	Special Weather Statement	BMX	Autauga	40 min
Mar 27, 9:34 PM CDT	Special Weather Statement	BMX	Walker, Winston	41 min
Mar 27, 9:43 PM CDT	Special Weather Statement	BMX	Coosa, Elmore, Tallapoosa	47 min
Mar 27, 10:15 PM CDT	Severe Thunderstorm Warning	BMX	Elmore, Lee, Macon, Tallapoosa	30 min
Mar 27, 10:30 PM CDT	Special Weather Statement	BMX	Winston	45 min
Mar 27, 10:31 PM CDT	Special Weather Statement	BMX	Chambers, Tallapoosa	44 min
Mar 27, 10:36 PM CDT	Severe Thunderstorm Warning	BMX	Lee, Macon, Russell	39 min
Mar 27, 11:13 PM CDT	Special Weather Statement	BMX	Russell	47 min
Mar 27, 11:16 PM CDT	Severe Thunderstorm Warning	BMX	Lee, Russell	29 min
Mar 27, 11:28 PM CDT	Special Weather Statement	BMX	Randolph	47 min
Mar 27, 11:30 PM CDT	Special Weather Statement	BMX	Blount	45 min
Mar 27, 11:58 PM CDT	Special Weather Statement	BMX	Etowah	47 min
Mar 28, 12:03 AM CDT	Severe Thunderstorm Warning	BMX	Marion	42 min
Mar 28, 12:31 AM CDT	Special Weather Statement	BMX	Tuscaloosa	44 min
Mar 28, 12:50 AM CDT	Special Weather Statement	BMX	Marion, Winston	40 min
Mar 28, 12:57 AM CDT	Severe Thunderstorm Warning	BMX	Bibb, Jefferson, Shelby, Tuscaloosa	48 min
Mar 28, 1:13 AM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Shelby, Tuscaloosa	47 min
Mar 28, 1:32 AM CDT	Severe Thunderstorm Warning	BMX	Marion, Winston	43 min
Mar 28, 1:43 AM CDT	Special Weather Statement	BMX	Cleburne	47 min
Mar 28, 1:46 AM CDT	Special Weather Statement	BMX	Blount, Etowah	44 min
Mar 28, 1:50 AM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Jefferson, St. Clair, Shelby, Talladega	40 min
Mar 28, 2:10 AM CDT	Special Weather Statement	BMX	Marion	50 min
Mar 28, 2:25 AM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cleburne	31 min
Mar 28, 2:42 AM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cleburne	14 min
Mar 28, 2:47 AM CDT	Special Weather Statement	BMX	Clay	43 min
Mar 28, 3:16 AM CDT	Special Weather Statement	BMX	Jefferson, St. Clair	44 min
Mar 28, 3:21 AM CDT	Special Weather Statement	BMX	Marshall	39 min
Mar 28, 3:24 AM CDT	Special Weather Statement	BMX	Etowah	51 min
Mar 28, 3:25 AM CDT	Special Weather Statement	BMX	Cleburne	20 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.