Alert archive / Alabama / Tornado Warnings in 2011

Tornado Warning 142, NWS Mobile, AL

November 16, 2011Choctaw County, Alabama

NWS Mobile, AL issued this tornado warning at Nov 16, 2011, 6:37 AM CST for Choctaw County, Alabama. It was in force for 34 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: Nov 16, 2011, 6:37 AM CST (12:37 UTC)
Expired: Nov 16, 2011, 7:11 AM CST
In force: 34 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Choctaw County, AL

The radar

The Jackson/Brandon,MS radar (KDGX), 151 km from the middle of the area, began a volume at 12:39 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
Nov 16, 2:20 AM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 0.6 hours before the alert went out and 160 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: 602 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 462 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

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

105 
WFUS54 KMOB 161237
TORMOB
ALC023-161330-
/O.NEW.KMOB.TO.W.0142.111116T1237Z-111116T1330Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOBILE AL
637 AM CST WED NOV 16 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN CHOCTAW COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 730 AM CST

* AT 635 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 18 MILES
  SOUTHEAST OF MERIDIAN...OR 15 MILES WEST OF LISMAN...MOVING
  NORTHEAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MOLLIE...             YANTLEY...            PUSHMATAHA...
  HALSELL...            CYRIL...              CROMWELL...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MANUFACTURED HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 AM CST WEDNESDAY MORNING
FOR SOUTHWEST ALABAMA AND SOUTHEAST MISSISSIPPI.

&&

LAT...LON 3210 8845 3219 8844 3231 8843 3231 8842
      3231 8811
TIME...MOT...LOC 1237Z 231DEG 43KT 3224 8845

$$

1 follow-up statement

866 
WWUS54 KMOB 161311
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
711 AM CST WED NOV 16 2011

ALC023-161320-
/O.CAN.KMOB.TO.W.0142.000000T0000Z-111116T1330Z/
CHOCTAW AL-
711 AM CST WED NOV 16 2011

...THE TORNADO WARNING FOR NORTHWESTERN CHOCTAW COUNTY IS
CANCELLED...

THE THUNDERSTORM PRODUCING THE POSSIBLE TORNADO HAS MOVED OUT OF THE 
COUNTY.  

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 AM CST WEDNESDAY MORNING
FOR SOUTHWEST ALABAMA AND SOUTHEAST MISSISSIPPI.

LAT...LON 3210 8845 3219 8844 3231 8843 3231 8842
      3231 8811
TIME...MOT...LOC 1310Z 231DEG 43KT 3249 8809

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 16, 7:35 AM CST	Tornado Warning	MOB	Washington	40 min
Nov 16, 8:27 AM CST	Tornado Warning	MOB	Choctaw, Clarke	63 min
Nov 16, 9:13 AM CST	Tornado Warning	MOB	Clarke, Monroe, Washington	47 min
Nov 16, 9:29 AM CST	Tornado Warning	MOB	Clarke, Monroe, Wilcox	37 min
Nov 16, 9:51 AM CST	Special Marine Warning	MOB		114 min
Nov 16, 10:26 AM CST	Special Marine Warning	MOB		2 hr
Nov 16, 10:35 AM CST	Severe Thunderstorm Warning	MOB	Butler, Conecuh, Crenshaw, Monroe, Wilcox	55 min
Nov 16, 10:39 AM CST	Tornado Warning	MOB	Butler, Crenshaw, Monroe, Wilcox	55 min
Nov 16, 10:48 AM CST	Small Craft Advisory	MOB		46 hr
Nov 16, 11:45 AM CST	Special Marine Warning	MOB		2 hr
Nov 16, 1:02 PM CST	Special Marine Warning	MOB		97 min
Nov 16, 2:33 PM CST	Fire Weather Watch	MOB	Butler, Choctaw, Clarke, Conecuh, Covington, Crenshaw and 4 more	15 hr

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.