Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 112, NWS Birmingham, AL

April 4, 20114 counties in Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 4, 2011, 6:40 PM CDT for 4 counties in Alabama. It was in force for 50 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: Apr 4, 2011, 6:40 PM CDT (23:40 UTC)
Expired: Apr 4, 2011, 7:30 PM CDT
In force: 50 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Greene County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL

The radar

The Birmingham radar (KBMX), 108 km from the middle of the area, began a volume at 23:42 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, 6:51 PM CDT	TSTM WND DMG	Benevola, AL	A FEW TREES WERE BLOWN DOWN NEAR BENEVOLA IN THE SOUTHEASTERN PART OF THE COUNTY.

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
Apr 4, 4:55 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 11.7 hours before the alert went out and 107 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.

609 
WUUS54 KBMX 042340
SVRBMX
ALC063-107-119-125-050030-
/O.NEW.KBMX.SV.W.0112.110404T2340Z-110405T0030Z/

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

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN GREENE COUNTY IN WEST CENTRAL ALABAMA...
  SOUTHEASTERN PICKENS COUNTY IN WEST CENTRAL ALABAMA...
  NORTHWESTERN SUMTER COUNTY IN WEST CENTRAL ALABAMA...
  SOUTHWESTERN TUSCALOOSA COUNTY IN WEST CENTRAL ALABAMA...

* UNTIL 730 PM CDT

* AT 641 PM CDT...THE NATIONAL WEATHER SERVICE 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 7 MILES WEST OF PANOLA TO 9 MILES WEST
  OF BOYD...AND MOVING NORTHEAST AT 65 MPH.

* LOCATIONS IMPACTED INCLUDE...
  EMELLE...PANOLA...WEST UNION...GAINESVILLE...NEW WEST GREENE...WEST
  GREENE...BENEVOLA AND MANTUA.

THIS INCLUDES...
INTERSTATE 20 EXIT NUMBERS 45 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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THESE STORMS. 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 3295 8835 3324 8772 3302 8766 3301 8767
      3301 8771 3299 8772 3298 8774 3297 8775
      3262 8839
TIME...MOT...LOC 2341Z 236DEG 58KT 3302 8831 3270 8838

$$

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, 4:35 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Marion, Walker, Winston	40 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

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.