Alert archive / Alabama / Tornado Warnings in 2011

Tornado Warning 43, NWS Birmingham, AL

April 11, 2011Marengo County, Alabama

NWS Birmingham, AL issued this tornado warning at Apr 11, 2011, 7:34 PM CDT for Marengo County, Alabama. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 11, 2011, 7:34 PM CDT (00:34 UTC)
Expired: Apr 11, 2011, 8:00 PM CDT
In force: 26 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

County Marengo County, AL

The radar

The Birmingham radar (KBMX), 139 km from the middle of the area, began a volume at 00:34 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.

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 00:00Z, 0.6 hours before the alert went out and 139 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: 557 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1487 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 271 m²/s²
0-3 km storm-relative helicity: 323 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 9.2

Open this sounding in Storm Lab

The text

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

295 
WFUS54 KBMX 120034
TORBMX
ALC091-120100-
/O.NEW.KBMX.TO.W.0043.110412T0034Z-110412T0100Z/

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

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN MARENGO COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 800 PM CDT

* AT 730 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM
  WAS LOCATED NEAR NANAFALIA...OR 18 MILES SOUTHWEST OF LINDEN...AND
  MOVING EAST AT 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SWEET WATER...DIXONS MILL...WAYNE...MILLER...SHILOH...SURGINER...
  MAGNOLIA...THOMASTON...CONSUL AND HALF ACRE.

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 3216 8802 3219 8801 3239 8752 3232 8753
      3231 8747 3230 8746 3227 8747 3226 8751
      3214 8752 3213 8761 3204 8762 3202 8802
      3214 8805
TIME...MOT...LOC 0034Z 253DEG 54KT 3211 8791

$$

17/KLAWS

2 follow-up statements

186 
WWUS54 KBMX 120047
SVSBMX

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

ALC091-120100-
/O.CON.KBMX.TO.W.0043.000000T0000Z-110412T0100Z/
MARENGO AL-
747 PM CDT MON APR 11 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL MARENGO COUNTY
UNTIL 800 PM CDT...

AT 747 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR SHILOH...OR 12 MILES SOUTHEAST OF LINDEN...
MOVING EAST AT 55 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAGNOLIA...THOMASTON AND CONSUL.

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

LAT...LON 3217 8790 3225 8785 3239 8752 3232 8753
      3231 8747 3230 8746 3227 8747 3226 8751
      3214 8752 3213 8761 3204 8762 3204 8788
TIME...MOT...LOC 0048Z 256DEG 50KT 3215 8770

$$

17/KLAWS

269 
WWUS54 KBMX 120057
SVSBMX

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

ALC091-120100-
/O.CON.KBMX.TO.W.0043.000000T0000Z-110412T0100Z/
MARENGO AL-
757 PM CDT MON APR 11 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR EAST CENTRAL MARENGO
COUNTY UNTIL 800 PM CDT...

AT 755 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR MAGNOLIA...OR 12 MILES SOUTHEAST OF LINDEN...
MOVING EAST AT 55 MPH.

LOCATIONS IMPACTED INCLUDE...
  THOMASTON AND CONSUL.

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

LAT...LON 3206 8776 3217 8775 3226 8769 3239 8752
      3232 8753 3231 8747 3230 8746 3227 8747
      3226 8751 3214 8752 3213 8761 3204 8762
TIME...MOT...LOC 0057Z 250DEG 50KT 3218 8762

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 7:19 PM CDT	Tornado Warning	BMX	Jefferson, Shelby	21 min
Apr 11, 7:28 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Calhoun, Etowah, Jefferson, St. Clair, Talladega	62 min
Apr 11, 7:30 PM CDT	Severe Thunderstorm Warning	BMX	Dallas, Hale, Marengo, Perry	60 min
Apr 11, 7:34 PM CDT	Tornado Warning	BMX	Jefferson, St. Clair, Shelby	19 min
Apr 11, 7:41 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Bibb, Chilton, Clay, Coosa, Dallas and 4 more	64 min
Apr 11, 8:03 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Clay, Cleburne, Etowah, Randolph and 2 more	57 min
Apr 11, 8:20 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Dallas, Lowndes	40 min
Apr 11, 8:39 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Chambers, Clay, Coosa, Elmore, Montgomery and 3 more	66 min
Apr 11, 8:52 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Clay, Cleburne, Randolph	38 min
Apr 11, 8:53 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Dallas, Lowndes, Montgomery, Pike	67 min
Apr 11, 8:57 PM CDT	Tornado Warning	BMX	Cleburne	33 min
Apr 11, 9:26 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Clay, Elmore, Lee, Macon, Montgomery and 2 more	49 min
Apr 11, 10:01 PM CDT	Severe Thunderstorm Warning	BMX	Bullock, Lee, Macon, Montgomery, Russell	44 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.