Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 113, NWS Birmingham, AL

April 4, 20114 counties in Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 4, 2011, 7:06 PM CDT for 4 counties in Alabama. It was in force for 54 min. 9 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, 7:06 PM CDT (00:06 UTC)
Expired: Apr 4, 2011, 8:00 PM CDT
In force: 54 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Greene County, AL, Hale County, AL, Marengo County, AL, Sumter County, AL

The radar

The Birmingham radar (KBMX), 155 km from the middle of the area, began a volume at 00:10 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, 7:22 PM CDT	TSTM WND DMG	4 Nw York, AL	TREE DOWN ON CR 19
Apr 4, 7:25 PM CDT	TSTM WND DMG	2 N Cuba, AL	TREE DOWN ON NEAR CR 10 AND CR 27
Apr 4, 7:25 PM CDT	TSTM WND DMG	6 Se York, AL	TREE DOWN ON CR 42
Apr 4, 7:25 PM CDT	TSTM WND DMG	6 S York, AL	TREE DOWN ON NEAR CR 10 AND SR 17
Apr 4, 7:26 PM CDT	TSTM WND DMG	Livingston, AL	TREE DOWN IN LIVINGSTON.
Apr 4, 7:28 PM CDT	TSTM WND DMG	5 E York, AL	TREES DOWN ON CR13
Apr 4, 7:40 PM CDT	TSTM WND DMG	2 E Cuba, AL	TREE DOWN ON POWER POLE, LINES DOWN.
Apr 4, 7:40 PM CDT	TSTM WND DMG	E Cuba, AL	TREE DOWN ON POWER POLE, LINES DOWN. 6AVE E/STEVENS.
Apr 4, 8:05 PM CDT	TSTM WND DMG	5 Ne Linden, AL	A FEW TREES WERE BLOWN DOWN IN NORTHERN MARENGO 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 00:00Z, 0.1 hours before the alert went out and 155 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: 862 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 1607 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 251 m²/s²
0-3 km storm-relative helicity: 356 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 9.2

Open this sounding in Storm Lab

The text

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

802 
WUUS54 KBMX 050006
SVRBMX
ALC063-065-091-119-050100-
/O.NEW.KBMX.SV.W.0113.110405T0006Z-110405T0100Z/

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

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN GREENE COUNTY IN WEST CENTRAL ALABAMA...
  WESTERN HALE COUNTY IN WEST CENTRAL ALABAMA...
  NORTHWESTERN MARENGO COUNTY IN SOUTHWEST ALABAMA...
  SUMTER COUNTY IN WEST CENTRAL ALABAMA...

* UNTIL 800 PM CDT

* AT 704 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 SOUTHWEST OF EMELLE TO 19 MILES
  SOUTHWEST OF KINTERBISH...AND MOVING EAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CUBA...YORK...LIVINGSTON...EUTAW...DEMOPOLIS...LINDEN...BOYD AND
  KINTERBISH.

THIS INCLUDES...
INTERSTATE 20 EXIT NUMBERS 1 THROUGH 40...

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.

&&

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

LAT...LON 3237 8843 3266 8839 3299 8768 3225 8772
      3219 8801 3226 8801 3228 8803 3231 8800
      3230 8842 3231 8843
TIME...MOT...LOC 0006Z 262DEG 32KT 3269 8841 3222 8855

$$

61

1 follow-up statement

085 
WWUS54 KBMX 050034
SVSBMX

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

ALC063-065-091-119-050100-
/O.CON.KBMX.SV.W.0113.000000T0000Z-110405T0100Z/
MARENGO AL-SUMTER AL-HALE AL-GREENE AL-
734 PM CDT MON APR 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
GREENE...WESTERN HALE...SOUTHEASTERN SUMTER AND NORTHWESTERN MARENGO
COUNTIES UNTIL 800 PM CDT...

AT 733 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 AKRON TO 5 MILES NORTHWEST OF
INDIAN SPRINGS...MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  DEMOPOLIS...LINDEN...SAWYERVILLE...DUFFYS BEND...ARCOLA...
  JEFFERSON...MYRTLEWOOD...PIN HOOK...CHICKASAW STATE PARK AND US 80
  AND AL 28.

THIS INCLUDES...
INTERSTATE 20 EXIT NUMBERS 23 THROUGH 40...

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.

&&

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

LAT...LON 3278 8811 3299 8768 3225 8772 3219 8801
      3226 8801 3228 8803 3231 8800 3231 8801
      3231 8811 3230 8842
TIME...MOT...LOC 0034Z 286DEG 38KT 3289 8770 3231 8814

$$

61

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 7:08 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Hale, Jefferson, Shelby, Tuscaloosa	67 min
Apr 4, 7:11 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Etowah, Jefferson, St. Clair, Shelby	64 min
Apr 4, 7:14 PM CDT	Areal Flood Advisory	BMX	Bibb, Blount, Cherokee, Etowah, Fayette, Greene and 13 more	3 hr
Apr 4, 7:25 PM CDT	Flash Flood Warning	BMX	Lamar	3 hr
Apr 4, 7:27 PM CDT	Severe Thunderstorm Warning	BMX	Cherokee	48 min
Apr 4, 7:40 PM CDT	Flash Flood Warning	BMX	Blount, Jefferson, St. Clair, Walker	3 hr
Apr 4, 7:49 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cleburne, Talladega	41 min
Apr 4, 7:49 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Hale, Perry	26 min
Apr 4, 7:56 PM CDT	Severe Thunderstorm Warning	BMX	Hale, Marengo, Perry	34 min
Apr 4, 8:07 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Chilton, Coosa, Perry, Shelby, Talladega	38 min
Apr 4, 8:13 PM CDT	Severe Thunderstorm Warning	BMX	Bibb, Perry	17 min
Apr 4, 8:16 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Shelby	29 min
Apr 4, 8:25 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Chilton, Dallas, Lowndes, Marengo, Perry	65 min
Apr 4, 8:29 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Cleburne, St. Clair, Shelby, Talladega	46 min
Apr 4, 8:37 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Chilton, Clay, Coosa, Shelby, Talladega	38 min
Apr 4, 8:42 PM CDT	Areal Flood Advisory	BMX	Autauga, Calhoun, Chambers, Chilton, Clay, Cleburne and 10 more	3 hr
Apr 4, 8:58 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cleburne, Randolph, Talladega	47 min
Apr 4, 9:10 PM CDT	Severe Thunderstorm Warning	BMX	Clay, Coosa, Randolph, Tallapoosa	35 min
Apr 4, 9:14 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Elmore, Lowndes, Montgomery	31 min
Apr 4, 9:40 PM CDT	Severe Thunderstorm Warning	BMX	Bullock, Elmore, Lee, Lowndes, Macon, Montgomery and 1 more	65 min
Apr 4, 9:42 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Clay, Cleburne, Elmore, Randolph, Tallapoosa	63 min
Apr 4, 10:22 PM CDT	Severe Thunderstorm Warning	BMX	Bullock, Pike	38 min
Apr 4, 10:39 PM CDT	Severe Thunderstorm Warning	BMX	Barbour, Bullock, Chambers, Lee, Macon, Russell	51 min
Apr 4, 10:52 PM CDT	Areal Flood Advisory	BMX	Barbour, Bullock, Lee, Macon, Pike, Russell	113 min
Apr 4, 10:54 PM CDT	Severe Thunderstorm Warning	BMX	Barbour, Bullock, Pike	51 min
Apr 4, 11:26 PM CDT	Severe Thunderstorm Warning	BMX	Barbour, Russell	19 min
Apr 4, 11:43 PM CDT	Severe Thunderstorm Warning	BMX	Barbour	17 min
Apr 5, 3:10 PM CDT	Fire Weather Watch	BMX	Autauga, Barbour, Bullock, Chambers, Chilton, Coosa and 8 more	14 hr
Apr 5, 3:17 PM CDT	Frost Advisory	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	16 hr

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.