Alert archive / Alabama / Tornado Warnings in 2011

Tornado Warning 45, NWS Mobile, AL

April 15, 2011Washington County, Alabama

NWS Mobile, AL issued this tornado warning at Apr 15, 2011, 1:09 PM CDT for Washington County, Alabama. It was in force for 51 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, 1:09 PM CDT (18:09 UTC)
Expired: Apr 15, 2011, 2:00 PM CDT
In force: 51 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Washington County, AL

The radar

The Mobile radar (KMOB), 74 km from the middle of the area, began a volume at 18:10 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.

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

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.2 hours before the alert went out and 184 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: 2339 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 499 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 325 m²/s²
0-3 km storm-relative helicity: 504 m²/s²
Significant tornado parameter: 4.8
Supercell composite: 21.3

Open this sounding in Storm Lab

The text

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

414 
WFUS54 KMOB 151809
TORMOB
ALC129-151900-
/O.NEW.KMOB.TO.W.0045.110415T1809Z-110415T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOBILE AL
109 PM CDT FRI APR 15 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* TORNADO WARNING FOR...
  WASHINGTON COUNTY IN SOUTHWEST ALABAMA...
  THIS INCLUDES THE CITY OF CHATOM...

* UNTIL 200 PM CDT

* AT 105 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 9 MILES
  NORTHEAST OF LEAKESVILLE...OR 16 MILES SOUTH OF STATE LINE...MOVING
  NORTHEAST AT 40 MPH.

* THE TORNADO WILL BE NEAR...
  CHATOM AROUND 135 PM CDT...

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.

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

&&

LAT...LON 3156 8817 3133 8795 3115 8838 3115 8844
      3132 8844
TIME...MOT...LOC 1809Z 227DEG 33KT 3123 8839

$$

1 follow-up statement

882 
WWUS54 KMOB 151830
SVSMOB

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

ALC129-151900-
/O.CON.KMOB.TO.W.0045.000000T0000Z-110415T1900Z/
WASHINGTON AL-
130 PM CDT FRI APR 15 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 200 PM CDT FOR
WASHINGTON COUNTY...

AT 124 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS
TORNADO WAS NEAR TIBBIE...OR ABOUT 11 MILES SOUTH OF CHATOM...MOVING
NORTHEAST AT 40 MPH.

THE TORNADO WILL BE NEAR...
  CHATOM AROUND 135 PM CDT...
  RUTAN AND HAWTHORN AROUND 140 PM CDT...
  HOBSON...SUNFLOWER AND TOINETTE AROUND 145 PM CDT...

THE SAFEST PLACE TO BE DURING A TORNADO IS ON THE LOWEST FLOOR OF A
STURDY BUILDING...PREFERABLY IN AN INTERIOR HALLWAY OR A ROOM SUCH AS
A CLOSET OR BATHROOM. IF POSSIBLE...GET UNDER A WORKBENCH OR OTHER
PIECE OF STURDY FURNITURE. USE BLANKETS OR PILLOWS TO COVER YOUR BODY
AND ALWAYS STAY AWAY FROM WINDOWS.

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

LAT...LON 3122 8823 3135 8838 3156 8817 3133 8795
TIME...MOT...LOC 1827Z 227DEG 33KT 3132 8824

$$

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, 1:22 PM CDT	Tornado Warning	MOB	Clarke, Washington	21 min
Apr 15, 1:46 PM CDT	Tornado Warning	MOB	Clarke, Washington	44 min
Apr 15, 2:06 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw	27 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

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.