Alert archive / Alabama / Tornado Warnings in 2011

Tornado Warning 27, NWS Mobile, AL

April 4, 2011Clarke County, Monroe County, Washington County, Alabama

NWS Mobile, AL issued this tornado warning at Apr 4, 2011, 8:21 PM CDT for Clarke County, Monroe County, Washington County, Alabama. It was in force for 39 min. 3 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 4, 2011, 8:21 PM CDT (01:21 UTC)
Expired: Apr 4, 2011, 9:00 PM CDT
In force: 39 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Clarke County, AL, Monroe County, AL, Washington County, AL

The radar

The Mobile radar (KMOB), 95 km from the middle of the area, began a volume at 01:21 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 4, 8:48 PM CDT	TSTM WND DMG	5 Se Grove Hill, AL	EMA REPORTED TREE DOWN. TIME ESTIMATED FROM RADAR.
Apr 4, 8:48 PM CDT	TSTM WND DMG	Whately, AL	EMA REPORTS SEVERAL TREES DOWN NEAR WHATLEY. TIME ESTIMATED FROM RADAR.
Apr 4, 8:50 PM CDT	TSTM WND DMG	Jackson, AL	TREES DOWN IN THE JACKSON AREA ON DEPOT RD NEAR ELMS ST.

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 4, 5:28 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 1.4 hours before the alert went out and 216 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: 862 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 1607 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 251 m²/s²
0-3 km storm-relative helicity: 356 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 9.2

Open this sounding in Storm Lab

The text

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

765 
WFUS54 KMOB 050121
TORMOB
ALC025-099-129-050200-
/O.NEW.KMOB.TO.W.0027.110405T0121Z-110405T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOBILE AL
821 PM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* TORNADO WARNING FOR...
  WESTERN MONROE COUNTY IN SOUTH CENTRAL ALABAMA...
  THIS INCLUDES THE CITIES OF...MONROEVILLE...FRISCO CITY...
  SOUTHERN CLARKE COUNTY IN SOUTHWEST ALABAMA...
  THIS INCLUDES THE CITY OF JACKSON...
  CENTRAL WASHINGTON COUNTY IN SOUTHWEST ALABAMA...
  THIS INCLUDES THE CITY OF CHATOM...

* UNTIL 900 PM CDT

* AT 817 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 7 MILES SOUTH OF
  CHATOM...OR 14 MILES EAST OF STATE LINE...MOVING EAST AT 65 MPH.

* THE TORNADO WILL BE NEAR...
  CORTELUOU AND SAINT STEPHRNS AROUND 830 PM CDT...
  JACKSON AND CHOCTAW BLUFF AROUND 835 PM CDT...
  MANILLA...MANILA AND ALLEN AROUND 840 PM CDT...
  WHATELY AROUND 845 PM CDT...
  FRANKLIN AROUND 855 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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT TUESDAY MORNING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

&&

LAT...LON 3147 8725 3132 8760 3130 8778 3133 8780
      3130 8779 3124 8832 3144 8835 3180 8739
TIME...MOT...LOC 0121Z 248DEG 71KT 3139 8817

$$

1 follow-up statement

725 
WWUS54 KMOB 050153
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
853 PM CDT MON APR 4 2011

ALC025-099-129-050203-
/O.EXP.KMOB.TO.W.0027.000000T0000Z-110405T0200Z/
WASHINGTON AL-MONROE AL-CLARKE AL-
853 PM CDT MON APR 4 2011

...THE TORNADO WARNING FOR SOUTHERN CLARKE...CENTRAL MONROE AND
CENTRAL WASHINGTON COUNTIES WILL EXPIRE AT 900 PM CDT...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT TUESDAY MORNING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

LAT...LON 3147 8725 3132 8760 3130 8778 3133 8780
      3130 8779 3124 8832 3144 8835 3180 8739
TIME...MOT...LOC 0153Z 248DEG 71KT 3163 8748

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 7:05 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Washington	55 min
Apr 4, 7:08 PM CDT	Tornado Warning	MOB	Choctaw, Clarke, Washington	67 min
Apr 4, 7:30 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Mobile, Washington, Wilcox	60 min
Apr 4, 7:38 PM CDT	Tornado Warning	MOB	Washington	56 min
Apr 4, 7:54 PM CDT	Tornado Warning	MOB	Choctaw, Clarke, Washington	53 min
Apr 4, 8:30 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Butler, Clarke, Conecuh, Escambia, Mobile and 3 more	60 min
Apr 4, 9:41 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Conecuh, Covington, Crenshaw, Escambia	64 min
Apr 4, 9:44 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Covington, Escambia	61 min
Apr 4, 9:47 PM CDT	Special Marine Warning	MOB		88 min
Apr 4, 10:46 PM CDT	Severe Thunderstorm Warning	MOB	Covington	44 min
Apr 4, 11:36 PM CDT	Special Marine Warning	MOB		84 min
Apr 5, 5:09 AM CDT	Fire Weather Watch	MOB	Butler, Conecuh, Covington, Crenshaw, Escambia, Monroe and 1 more	25 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.