Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 101, NWS Birmingham, AL

April 4, 20114 counties in Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 4, 2011, 4:35 PM CDT for 4 counties in Alabama. It was in force for 40 min. 2 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: Apr 4, 2011, 4:35 PM CDT (21:35 UTC)
Expired: Apr 4, 2011, 5:15 PM CDT
In force: 40 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Fayette County, AL, Marion County, AL, Walker County, AL, Winston County, AL

The radar

The Columbus AFB radar (KGWX), 85 km from the middle of the area, began a volume at 21:37 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
Apr 4, 4:42 PM CDT	HAIL 1	Nw Fayette, AL
Apr 4, 5:02 PM CDT	TSTM WND DMG	Grayson, AL	A FEW TREES WERE BLOWN DOWN IN THE NATIONAL FOREST NEAR GRAYSON.

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
Apr 4, 1:03 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.6 hours before the alert went out and 111 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: 45 J/kg
Mixed-layer CIN: -348 J/kg
Mixed-layer LCL: 509 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 332 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.

101 
WUUS54 KBMX 042135
SVRBMX
ALC057-093-127-133-042215-
/O.NEW.KBMX.SV.W.0101.110404T2135Z-110404T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
435 PM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  FAYETTE COUNTY IN WEST CENTRAL ALABAMA...
  SOUTHEASTERN MARION COUNTY IN NORTHWEST ALABAMA...
  NORTHERN WALKER COUNTY IN CENTRAL ALABAMA...
  WINSTON COUNTY IN NORTHWEST ALABAMA...

* UNTIL 515 PM CDT

* AT 435 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A LINE OF
  SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PING PONG BALL SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM BRINN TO BRILLIANT TO BLUFF TO
  5 MILES NORTHWEST OF KENNEDY...AND MOVING NORTHEAST AT 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  FAYETTE...LYNN...CARBON HILL...ARLEY...JASPER...LAKE
  BUTTAHATCHEE...GLEN ALLEN AND BELK.

THIS INCLUDES...
US 78 EXIT NUMBERS 26 THROUGH 65...

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.

THESE STORMS HAVE A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

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

LAT...LON 3431 8712 3430 8711 3394 8710 3392 8708
      3377 8722 3359 8794 3365 8795 3397 8786
      3415 8787 3431 8725
TIME...MOT...LOC 2135Z 254DEG 51KT 3411 8779 3400 8777
          3379 8786 3364 8802

$$

75

1 follow-up statement

018 
WWUS54 KBMX 042155
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
455 PM CDT MON APR 4 2011

ALC057-093-127-133-042215-
/O.CON.KBMX.SV.W.0101.000000T0000Z-110404T2215Z/
FAYETTE AL-WALKER AL-WINSTON AL-MARION AL-
455 PM CDT MON APR 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
MARION...WINSTON...NORTHWESTERN WALKER AND NORTHERN FAYETTE COUNTIES
UNTIL 515 PM CDT...

AT 455 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR 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 HALEYVILLE TO LYNN TO GLEN ALLEN
TO 5 MILES SOUTHEAST OF BLOOMING GROVE...MOVING EAST AT 60 MPH.

LOCATIONS IMPACTED INCLUDE...
  LYNN...CARBON HILL...ARLEY...ELDRIDGE...ASHRIDGE...ASHBANK...
  WINSTON FREE STATE BARN...DOUBLE SPRINGS...HOUSTON RECREATIONAL
  AREA AND NAUVOO.

THIS INCLUDES...
US 78 EXIT NUMBERS 26 THROUGH 52...

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.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

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

LAT...LON 3431 8712 3430 8711 3417 8711 3402 8724
      3379 8748 3368 8794 3397 8786 3415 8787
      3431 8725
TIME...MOT...LOC 2155Z 254DEG 51KT 3419 8756 3408 8754
          3391 8769 3375 8786

$$

75

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 4:21 AM CDT	Wind Advisory	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	24 hr
Apr 4, 1:57 PM CDT	Special Weather Statement	BMX	Marion	48 min
Apr 4, 2:48 PM CDT	Special Weather Statement	BMX	Marion	42 min
Apr 4, 3:05 PM CDT	Areal Flood Advisory	BMX	Marion	115 min
Apr 4, 3:27 PM CDT	Special Weather Statement	BMX	Marion	48 min
Apr 4, 3:54 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Lamar, Marion, Pickens	51 min
Apr 4, 3:55 PM CDT	Areal Flood Advisory	BMX	Lamar	3 hr
Apr 4, 4:27 PM CDT	Special Weather Statement	BMX	Marion	48 min
Apr 4, 4:37 PM CDT	Flash Flood Warning	BMX	Lamar	3 hr
Apr 4, 4:43 PM CDT	Severe Thunderstorm Warning	BMX	Lamar, Pickens	47 min
Apr 4, 4:52 PM CDT	Severe Thunderstorm Warning	BMX	Marion, Winston	23 min
Apr 4, 4:53 PM CDT	Areal Flood Advisory	BMX	Winston	112 min
Apr 4, 5:19 PM CDT	Areal Flood Advisory	BMX	Fayette	116 min
Apr 4, 5:25 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Lamar, Pickens	50 min
Apr 4, 5:27 PM CDT	Special Weather Statement	BMX	Winston	48 min
Apr 4, 5:30 PM CDT	Severe Thunderstorm Warning	BMX	Walker, Winston	45 min
Apr 4, 5:52 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Walker	53 min
Apr 4, 5:56 PM CDT	Areal Flood Advisory	BMX	Pickens	3 hr
Apr 4, 6:04 PM CDT	Areal Flood Advisory	BMX	Walker	3 hr
Apr 4, 6:07 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Pickens, Tuscaloosa, Walker	38 min
Apr 4, 6:16 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Walker, Winston	44 min
Apr 4, 6:18 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Pickens, Sumter, Tuscaloosa	57 min
Apr 4, 6:20 PM CDT	Severe Thunderstorm Warning	BMX	Walker, Winston	40 min
Apr 4, 6:21 PM CDT	Areal Flood Advisory	BMX	Tuscaloosa	3 hr
Apr 4, 6:34 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Jefferson, Walker	41 min
Apr 4, 6:40 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Pickens, Sumter, Tuscaloosa	50 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.