Alert archive / Alabama / Tornado Warnings in 2011

Tornado Warning 29, NWS Mobile, AL

April 11, 2011Clarke County, Alabama

NWS Mobile, AL issued this tornado warning at Apr 11, 2011, 7:52 PM CDT for Clarke County, Alabama. It was in force for 22 min. 2 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 11, 2011, 7:52 PM CDT (00:52 UTC)
Expired: Apr 11, 2011, 8:14 PM CDT
In force: 22 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Clarke County, AL

The radar

The Mobile radar (KMOB), 126 km from the middle of the area, began a volume at 00:53 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 11, 8:02 PM CDT	TSTM WND DMG	1 Ese Tallahatta Spring, AL	POWER LINES REPORTED DOWN BY DOWNED TREE.
Apr 11, 8:11 PM CDT	TSTM WND DMG	3 Nne Grove Hill, AL	POWER LINES DOWN DUE TO DOWNED TREE AT INTERSECTION OF COUNTY ROAD 44 AND COUNTY ROAD 7.

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 11, 4:05 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 0.9 hours before the alert went out and 190 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.

522 
WFUS54 KMOB 120052
TORMOB
ALC025-120130-
/O.NEW.KMOB.TO.W.0029.110412T0052Z-110412T0130Z/

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

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN CLARKE COUNTY IN SOUTHWEST ALABAMA...
  THIS INCLUDES THE CITIES OF...THOMASVILLE...GROVE HILL...

* UNTIL 830 PM CDT

* AT 753 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 19 MILES WEST OF
  GROVE HILL...OR NEAR COFFEEVILLE...MOVING EAST AT 45 MPH.

* THE TORNADO WILL BE NEAR...
  THOMASVILLE AND FULTON AROUND 815 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.

IF IN MOBILE 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.

&&

LAT...LON 3195 8768 3171 8767 3168 8808 3171 8809
      3175 8809 3176 8811 3177 8814 3185 8816
TIME...MOT...LOC 0053Z 255DEG 40KT 3179 8802

$$

2 follow-up statements

084 
WWUS54 KMOB 120058
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
758 PM CDT MON APR 11 2011

ALC025-120130-
/O.CON.KMOB.TO.W.0029.000000T0000Z-110412T0130Z/
CLARKE AL-
758 PM CDT MON APR 11 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR NORTHERN
CLARKE COUNTY...

AT 758 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS
TORNADO WAS NEAR MCENTYRE...OR ABOUT 15 MILES NORTHWEST OF GROVE
HILL...MOVING EAST AT 55 MPH.

THE TORNADO WILL BE NEAR...
  GREENWOOD AND PEACOCK AROUND 805 PM CDT...
  ROUNDHILL...THOMASVILLE...RURAL AND SPRINGFIELD AROUND 810 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.

IF YOU ARE IN MOBILE HOME...EVACUATE IT AND GET ON THE LOWEST FLOOR
OF A NEARBY STURDY BUILDING OR IN AN UNDERGROUND STORM SHELTER. IF NO
SUBSTANTIAL SHELTER IS AVAILABLE AND A TORNADO IS FAST APPROACHING...
SEEK SHELTER IN A CULVERT...OR LIE FLAT IN THE NEAREST DITCH OR OTHER
LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

LAT...LON 3169 8796 3179 8803 3187 8805 3195 8768
      3171 8767
TIME...MOT...LOC 0058Z 248DEG 49KT 3183 8793

$$

647 
WWUS54 KMOB 120114
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
814 PM CDT MON APR 11 2011

ALC025-120124-
/O.CAN.KMOB.TO.W.0029.000000T0000Z-110412T0130Z/
CLARKE AL-
814 PM CDT MON APR 11 2011

...THE TORNADO WARNING FOR NORTHERN CLARKE COUNTY IS CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING 
FOR SOUTHWESTERN ALABAMA AND SOUTHEAST MISSISSIPPI. 

LAT...LON 3169 8796 3179 8803 3187 8805 3195 8768
      3171 8767
TIME...MOT...LOC 0114Z 248DEG 49KT 3191 8769

$$

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.