Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 44, NWS Mobile, AL

April 15, 2011Choctaw County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Apr 15, 2011, 2:06 PM CDT for Choctaw County, Alabama. It was in force for 27 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 15, 2011, 2:06 PM CDT (19:06 UTC)
Expired: Apr 15, 2011, 2:33 PM CDT
In force: 27 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Choctaw County, AL

The radar

The Jackson/Brandon,MS radar (KDGX), 159 km from the middle of the area, began a volume at 19:05 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 15, 7:32 AM CDT	Tornado Watch	SPC	7 hr
Apr 15, 11:21 AM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 7.1 hours before the alert went out and 168 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: 1458 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 523 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 382 m²/s²
0-3 km storm-relative helicity: 565 m²/s²
Significant tornado parameter: 4.0
Supercell composite: 14.6

Open this sounding in Storm Lab

The text

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

602 
WUUS54 KMOB 151906
SVRMOB
ALC023-151945-
/O.NEW.KMOB.SV.W.0044.110415T1906Z-110415T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
206 PM CDT FRI APR 15 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CHOCTAW COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 245 PM CDT

* AT 201 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 14 MILES WEST OF BUTLER...OR 10
  MILES WEST OF LISMAN...AND MOVING NORTHEAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MOLLIE AND CROMWELL AROUND 215 PM CDT...
  HALSELL AND JACHIN AROUND 220 PM CDT...
  PELHAM AND INDIAN SPRINGS AROUND 225 PM CDT...
  EDNA AROUND 230 PM CDT...
  OAKCHIA AROUND 235 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM CDT FRIDAY EVENING FOR
SOUTHWESTERN ALABAMA AND SOUTHEAST MISSISSIPPI.

&&

LAT...LON 3231 8798 3215 8823 3209 8844 3211 8846
      3227 8844 3229 8843 3230 8842
TIME...MOT...LOC 1906Z 234DEG 41KT 3219 8839

$$

1 follow-up statement

979 
WWUS54 KMOB 151933
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
233 PM CDT FRI APR 15 2011

ALC023-151941-
/O.CAN.KMOB.SV.W.0044.000000T0000Z-110415T1945Z/
CHOCTAW AL-
233 PM CDT FRI APR 15 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CHOCTAW COUNTY IS
CANCELLED...

THE STORM THAT PROMPTED THE WARNING HAS EXITED CHOCTAW COUNTY. 
THEREFORE...THE WARNING WILL BE CANCELLED.  MEANWHILE...A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 900 PM CDT FRIDAY EVENING FOR 
SOUTHWESTERN ALABAMA AND SOUTHEAST MISSISSIPPI.

LAT...LON 3231 8798 3215 8823 3209 8844 3211 8846
      3227 8844 3229 8843 3230 8842
TIME...MOT...LOC 1931Z 234DEG 41KT 3229 8806

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 14, 10:41 PM CDT	Small Craft Advisory	MOB		44 hr
Apr 15, 10:20 AM CDT	Tornado Warning	MOB	Washington	40 min
Apr 15, 10:50 AM CDT	Tornado Warning	MOB	Clarke, Washington	40 min
Apr 15, 10:56 AM CDT	Tornado Warning	MOB	Choctaw	49 min
Apr 15, 11:09 AM CDT	Tornado Warning	MOB	Washington	51 min
Apr 15, 11:26 AM CDT	Tornado Warning	MOB	Clarke, Monroe	49 min
Apr 15, 11:41 AM CDT	Tornado Warning	MOB	Choctaw	64 min
Apr 15, 11:52 AM CDT	Tornado Warning	MOB	Choctaw, Clarke, Washington	38 min
Apr 15, 12:07 PM CDT	Tornado Warning	MOB	Monroe	38 min
Apr 15, 12:20 PM CDT	Tornado Warning	MOB	Choctaw, Clarke, Washington	40 min
Apr 15, 12:35 PM CDT	Tornado Warning	MOB	Monroe, Wilcox	24 min
Apr 15, 12:44 PM CDT	Tornado Warning	MOB	Washington	46 min
Apr 15, 12:51 PM CDT	Tornado Warning	MOB	Clarke, Wilcox	33 min
Apr 15, 1:09 PM CDT	Tornado Warning	MOB	Washington	51 min
Apr 15, 1:22 PM CDT	Tornado Warning	MOB	Clarke, Washington	21 min
Apr 15, 1:46 PM CDT	Tornado Warning	MOB	Clarke, Washington	44 min
Apr 15, 2:22 PM CDT	Tornado Warning	MOB	Clarke, Monroe, Wilcox	38 min
Apr 15, 2:55 PM CDT	Tornado Warning	MOB	Monroe, Wilcox	50 min
Apr 15, 3:18 PM CDT	Tornado Warning	MOB	Butler, Conecuh, Monroe, Wilcox	57 min
Apr 15, 3:41 PM CDT	Tornado Warning	MOB	Clarke, Washington	32 min
Apr 15, 4:02 PM CDT	Tornado Warning	MOB	Choctaw	58 min
Apr 15, 4:27 PM CDT	Tornado Warning	MOB	Clarke, Monroe	48 min
Apr 15, 4:57 PM CDT	Tornado Warning	MOB	Choctaw	42 min
Apr 15, 5:09 PM CDT	Tornado Warning	MOB	Butler, Conecuh, Monroe, Wilcox	51 min
Apr 15, 5:44 PM CDT	Tornado Warning	MOB	Monroe, Wilcox	31 min
Apr 15, 5:47 PM CDT	Tornado Warning Emergency	MOB	Choctaw	58 min
Apr 15, 5:54 PM CDT	Tornado Warning	MOB	Wilcox	51 min
Apr 15, 5:59 PM CDT	Tornado Warning	MOB	Butler	26 min
Apr 15, 6:23 PM CDT	Tornado Warning	MOB	Wilcox	32 min
Apr 15, 6:34 PM CDT	Tornado Warning	MOB	Choctaw	41 min
Apr 15, 6:44 PM CDT	Tornado Warning	MOB	Choctaw, Clarke, Washington	61 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.