Alert archive / Alabama / Tornado Warnings in 2011

Tornado Warning 38, NWS Birmingham, AL

April 11, 2011Greene County, Hale County, Alabama

NWS Birmingham, AL issued this tornado warning at Apr 11, 2011, 6:43 PM CDT for Greene County, Hale County, Alabama. It was in force for 15 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 11, 2011, 6:43 PM CDT (23:43 UTC)
Expired: Apr 11, 2011, 6:58 PM CDT
In force: 15 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Greene County, AL, Hale County, AL

The radar

The Birmingham radar (KBMX), 98 km from the middle of the area, began a volume at 23:43 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 11, 7:04 PM CDT	TSTM WND DMG	Greensboro, AL	NUMEROUS TREES DOWN ACROSS 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 11, 4:05 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 98 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: 9 J/kg
Mixed-layer CIN: -684 J/kg
Mixed-layer LCL: 606 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 179 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.

642 
WFUS54 KBMX 112343
TORBMX
ALC063-065-120030-
/O.NEW.KBMX.TO.W.0038.110411T2343Z-110412T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
643 PM CDT MON APR 11 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL GREENE COUNTY IN WEST CENTRAL ALABAMA...
  CENTRAL HALE COUNTY IN WEST CENTRAL ALABAMA...

* UNTIL 730 PM CDT

* AT 638 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM
  WAS LOCATED NEAR WALDEN QUARTERS...OR NEAR EUTAW...AND MOVING EAST
  AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  GREENSBORO...WALDEN QUARTERS...WEDGEWORTH...EVANSVILLE...
  SAWYERVILLE...GREENSBORO MUNICIPAL AIRPORT...SELDON LOCK AND DAM
  AND HARPER HILL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR OF A STURDY BUILDING.

&&

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

LAT...LON 3283 8795 3289 8746 3266 8748 3266 8751
      3264 8752 3272 8796
TIME...MOT...LOC 2343Z 273DEG 25KT 3277 8787

$$

56

1 follow-up statement

930 
WWUS54 KBMX 112358
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
658 PM CDT MON APR 11 2011

ALC063-065-120008-
/O.CAN.KBMX.TO.W.0038.000000T0000Z-110412T0030Z/
HALE AL-GREENE AL-
658 PM CDT MON APR 11 2011

...THE TORNADO WARNING FOR CENTRAL GREENE AND CENTRAL HALE 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 11 PM CDT.

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

LAT...LON 3283 8795 3289 8746 3266 8748 3266 8751
      3264 8752 3272 8796
TIME...MOT...LOC 2358Z 273DEG 25KT 3276 8775

$$

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 3:52 AM CDT	Wind Advisory	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	20 hr
Apr 11, 5:12 PM CDT	Special Weather Statement	BMX	Fayette, Lamar, Marion, Winston	48 min
Apr 11, 5:36 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Pickens, Sumter, Tuscaloosa	39 min
Apr 11, 5:42 PM CDT	Tornado Warning	BMX	Fayette, Walker	22 min
Apr 11, 6:08 PM CDT	Tornado Warning	BMX	Greene, Pickens, Tuscaloosa	37 min
Apr 11, 6:13 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Greene, Jefferson, Pickens, Tuscaloosa	47 min
Apr 11, 6:17 PM CDT	Special Weather Statement	BMX	Blount, Walker	43 min
Apr 11, 6:38 PM CDT	Tornado Warning	BMX	Bibb, Tuscaloosa	29 min
Apr 11, 6:43 PM CDT	Tornado Warning	BMX	Bibb, Hale, Tuscaloosa	14 min
Apr 11, 6:48 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Dallas, Greene, Hale, Jefferson and 5 more	57 min
Apr 11, 6:52 PM CDT	Tornado Warning	BMX	Blount	38 min
Apr 11, 6:53 PM CDT	Tornado Warning	BMX	Jefferson, Tuscaloosa	52 min

Nearby

Tornado Warnings in Alabama, 2011 Every tornado warning in 2011 Tornadoes 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.