Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 37, NWS Mobile, AL

April 4, 20115 counties in Alabama; 5 counties in Mississippi

NWS Mobile, AL issued this severe thunderstorm warning at Apr 4, 2011, 7:30 PM CDT for 5 counties in Alabama; 5 counties in Mississippi. It was in force for 60 min. 17 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, 7:30 PM CDT (00:30 UTC)
Expired: Apr 4, 2011, 8:30 PM CDT
In force: 60 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Choctaw County, AL, Clarke County, AL, Mobile County, AL, Washington County, AL, Wilcox County, AL, George County, MS, Greene County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 114 km from the middle of the area, began a volume at 00:30 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, 7:35 PM CDT	TSTM WND DMG	1 S Needham, AL	MULTIPLE TREES REPORTED DOWN IN THE NEEDHAM AREA. REPORTED BY WTOK.
Apr 4, 7:40 PM CDT	TSTM WND DMG	4 Wnw Mcswain, MS	TREES DOWN ON BUCKS CREEK ROAD.
Apr 4, 7:40 PM CDT	TSTM WND DMG	5 Wnw New Augusta, MS	TREES DOWN ON MCKENZIE ROAD.
Apr 4, 7:40 PM CDT	TSTM WND DMG	Ne Richton, MS	TREES DOWN ON HWY 15 JUST NORTH OF RICHTON.
Apr 4, 7:49 PM CDT	TSTM WND DMG	Avera, MS	LOCAL EMA REPORTS PROBABLE STRAIGHT-LINE WIND DAMAGE IN AVERA. PATH LENGTH ESTIMATED TO BE A COUPLE HUNDRED YARDS WIDE AND A COUPLE MILES LONG. DAMAGE TIME ESTIMATED FROM RADAR.
Apr 4, 7:49 PM CDT	TORNADO	Avera, MS	AT 830PM CDT...THE COUNTY EMA RECIEVED INFORMATION FROM LOCAL LAW ENFORCEMENT OF TORNADO DAMAGE INCLUDING TREE AND POWERLINE DAMAGE. SEVERAL CAR ACCIDENTS MAY ALSO BE RELATED.
Apr 4, 7:54 PM CDT	TSTM WND DMG	3 Sse Wiggins, MS	A TREE DOWN ON INDA ROAD.
Apr 4, 7:55 PM CDT	TSTM WND GST 50	E Wiggins, MS	STORM SPOTTER REPORTED WINDS OF 50 MPH IN WIGGINS.
Apr 4, 7:58 PM CDT	TSTM WND DMG	15 Ne Avera, MS	NEAR THE TOWN OF OLD AVERA...EMA REPORTS A LARGE STAND OF PINE TREES WERE BROKEN COMPLETELY IN HALF. EMA ADDS THAT DAMAGE WAS MORE THAN A 100 YARDS WIDE...AND THAT THE DAMAGE COULD HAVE POSSIBLY BEEN FROM A TORNADO.
Apr 4, 7:58 PM CDT	TSTM WND DMG	Jonathan, MS	A METAL PORCH AWNING WAS DESTROYED IN JONATHAN.
Apr 4, 8:07 PM CDT	TSTM WND DMG	1 S Coffeeville, AL	TREES DOWN ON WEST BEND RD. TIME ESTIMATED FROM RADAR.
Apr 4, 8:07 PM CDT	TSTM WND DMG	8 Sse Coffeeville, AL	TREES DOWN ON HWY 69 IN SALITPA...8 MILES SSE OF COFFEEVILLE. TIME ESTIMATED FROM RADAR.
Apr 4, 8:27 PM CDT	TSTM WND DMG	Thomasville, AL	EMA REPORTS TREE AND 3-PHASE POWER LINE DAMAGE. TIME ESTIMATED FROM RADAR.
Apr 4, 8:30 PM CDT	TSTM WND DMG	2 Wsw Basin, MS	GEORGE COUNTY SHERIFF REPORTED TREES DOWN ALONG DEER LANE IN PLUM BLUFF ESTATES. ALSO NUMEROUS POWER OUTAGES IN THE AREA.
Apr 4, 8:30 PM CDT	HAIL 0.88	2 W Thomasville, AL
Apr 4, 8:35 PM CDT	TSTM WND DMG	10 S Thomasville, AL	EMA REPORTS NEAR THE COMMUNITY OF LIBERTY...HALFWAY BETWEEN THOMASVILLE AND GROVE HILL...A TREE HAS FALLEN ACROSS OLD HWY 5. TIME ESTIMATED FROM RADAR.
Apr 4, 8:40 PM CDT	TSTM WND DMG	Grove Hill, AL	TREE DOWN ON HWY 43 IN GROVE HILL NEAR CHILTON RD. TIME ESTIMATED FROM RADAR.

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

Slidell Radar S, LA (KSIL), launched 00:00Z, 0.5 hours before the alert went out and 209 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: 3275 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 562 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 245 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 4.7
Supercell composite: 20.4

Open this sounding in Storm Lab

The text

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

163 
WUUS54 KMOB 050030
SVRMOB
ALC023-025-097-129-131-MSC039-041-111-131-153-050130-
/O.NEW.KMOB.SV.W.0037.110405T0030Z-110405T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
730 PM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN WILCOX COUNTY IN SOUTH CENTRAL ALABAMA...
  GEORGE COUNTY IN SOUTHEAST MISSISSIPPI...
  GREENE COUNTY IN SOUTHEAST MISSISSIPPI...
  PERRY COUNTY IN SOUTHEAST MISSISSIPPI...
  STONE COUNTY IN SOUTHEAST MISSISSIPPI...
  WAYNE COUNTY IN SOUTHEAST MISSISSIPPI...
  CHOCTAW COUNTY IN SOUTHWEST ALABAMA...
  CLARKE COUNTY IN SOUTHWEST ALABAMA...
  NORTHWESTERN MOBILE COUNTY IN SOUTHWEST ALABAMA...
  WASHINGTON COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 830 PM CDT

* AT 726 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS
  WERE LOCATED ALONG A LINE EXTENDING FROM 16 MILES NORTH OF BUTLER
  TO 22 MILES NORTHWEST OF DIAMONDHEAD...AND MOVING EAST AT 55 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. 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 100 AM CDT TUESDAY MORNING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

&&

LAT...LON 3231 8792 3228 8801 3216 8800 3201 8810
      3201 8763 3214 8762 3215 8753 3228 8751
      3215 8725 3074 8842 3073 8886 3068 8888
      3066 8934 3091 8934 3092 8914 3125 8914
      3185 8863 3189 8848 3205 8846 3232 8823
TIME...MOT...LOC 0030Z 269DEG 46KT 3232 8811 3064 8954

$$

3 follow-up statements

223 
WWUS54 KMOB 050045
SVSMOB

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

ALC023-025-097-129-131-MSC039-041-111-131-153-050130-
/O.CON.KMOB.SV.W.0037.000000T0000Z-110405T0130Z/
WASHINGTON AL-CLARKE AL-WILCOX AL-CHOCTAW AL-GEORGE MS-STONE MS-
PERRY MS-GREENE MS-WAYNE MS-MOBILE AL-
745 PM CDT MON APR 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CDT
FOR NORTHWESTERN MOBILE...WAYNE...GREENE...PERRY...STONE...GEORGE...
CHOCTAW...WESTERN WILCOX...CLARKE AND WASHINGTON COUNTIES...

AT 740 PM CDT...NATIONAL WEATHER SERVICE RADAR CONTINUED TO INDICATE 
A LINE OF SEVERE THUNDERSTORMS.  THESE STORMS WERE ALONG A LINE 
EXTENDING FROM OAKCHIA TO 8 MILES SOUTHWEST OF ROGERS LAKE...OR 
ALONG A LINE EXTENDING FROM 10 MILES WEST OF LINDEN TO 18 MILES NORTH
OF DIAMONDHEAD...MOVING EAST AT 55 MPH.  ONE OF THE STRONGER STORMS 
IN THIS LINE OF SEVERE THUNDERSTORMS WAS LOCATED NEAR LITTLE 
WALKER...OR ABOUT 6 MILES NORTH OF BUTLER...MOVING NORTHEAST AT 35 
MPH.  THIS STORM IS CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND 
DESTRUCTIVE WINDS OVER 70 MPH. 

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THESE STORMS.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY ON THE
LOWEST FLOOR OF A STURDY BUILDING...PREFERABLY IN AN INTERIOR HALLWAY
OR A ROOM SUCH AS A CLOSET OR BATHROOM.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY ON THE LOWEST
FLOOR OF A STURDY BUILDING...PREFERABLY IN AN INTERIOR HALLWAY OR A
ROOM SUCH AS A CLOSET OR BATHROOM.

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

LAT...LON 3231 8792 3228 8801 3216 8800 3201 8810
      3201 8763 3214 8762 3215 8753 3228 8751
      3215 8725 3074 8842 3073 8886 3068 8888
      3066 8934 3091 8934 3092 8914 3125 8914
      3185 8863 3189 8848 3205 8846 3232 8823
TIME...MOT...LOC 0043Z 269DEG 46KT 3232 8791 3064 8935

$$

258 
WWUS54 KMOB 050103
SVSMOB

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

ALC023-025-097-129-131-MSC039-041-111-131-153-050130-
/O.CON.KMOB.SV.W.0037.000000T0000Z-110405T0130Z/
WASHINGTON AL-CLARKE AL-WILCOX AL-CHOCTAW AL-GEORGE MS-STONE MS-
PERRY MS-GREENE MS-WAYNE MS-MOBILE AL-
803 PM CDT MON APR 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CDT
FOR NORTHWESTERN MOBILE...EASTERN WAYNE...GREENE...SOUTHEASTERN
PERRY...STONE...GEORGE...CHOCTAW...WESTERN WILCOX...CLARKE AND
WASHINGTON COUNTIES...

AT 758 PM CDT...NATIONAL WEATHER SERVICE RADAR CONTINUED TO INDICATE 
A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE 
HAIL...AND DESTRUCTIVE WINDS OVER 70 MPH.  THESE STORMS WERE ALONG A 
LINE EXTENDING FROM 12 MILES WEST OF CARLEYS TO 6 MILES SOUTHWEST OF 
MCHENRY...OR ALONG A LINE EXTENDING FROM 7 MILES EAST OF LINDEN TO 15
MILES SOUTH OF WIGGINS...MOVING EAST AT 45 MPH.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THESE STORMS.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY ON THE
LOWEST FLOOR OF A STURDY BUILDING...PREFERABLY IN AN INTERIOR HALLWAY
OR A ROOM SUCH AS A CLOSET OR BATHROOM.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY ON THE LOWEST
FLOOR OF A STURDY BUILDING...PREFERABLY IN AN INTERIOR HALLWAY OR A
ROOM SUCH AS A CLOSET OR BATHROOM.

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

LAT...LON 3092 8914 3138 8891 3226 8815 3231 8793
      3231 8792 3228 8801 3216 8800 3206 8811
      3201 8810 3201 8763 3214 8762 3215 8753
      3228 8751 3215 8725 3074 8843 3073 8886
      3068 8888 3068 8934
TIME...MOT...LOC 0101Z 268DEG 38KT 3233 8765 3066 8919

$$

303 
WWUS54 KMOB 050115
SVSMOB

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

ALC023-025-097-129-131-MSC039-041-111-131-153-050130-
/O.CON.KMOB.SV.W.0037.000000T0000Z-110405T0130Z/
WASHINGTON AL-CLARKE AL-WILCOX AL-CHOCTAW AL-GEORGE MS-STONE MS-
PERRY MS-GREENE MS-WAYNE MS-MOBILE AL-
815 PM CDT MON APR 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CDT
FOR NORTHWESTERN MOBILE...SOUTHEASTERN WAYNE...GREENE...SOUTHEASTERN
PERRY...STONE...GEORGE...SOUTHERN CHOCTAW...WESTERN WILCOX...CLARKE
AND WASHINGTON COUNTIES...

AT 810 PM CDT...NATIONAL WEATHER SERVICE RADAR CONTINUED TO INDICATE 
A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE 
HAIL...AND DESTRUCTIVE WINDS OVER 70 MPH.  THESE STORMS WERE ALONG A 
LINE EXTENDING FROM 6 MILES NORTHWEST OF CARLEYS TO MCHENRY...OR 
ALONG A LINE EXTENDING FROM 13 MILES EAST OF LINDEN TO 14 MILES 
SOUTH OF WIGGINS...MOVING EAST AT 45 MPH.

A SEVERE THUNDERSTORM HAS DEVELOPED OUT AHEAD OF THIS LINE OF STORMS 
WAS LOCATED NEAR EVANSTON...OR ABOUT NEAR LUCEDALE...MOVING 
NORTHEAST AT 40 MPH.  THIS STORM HAS THE CAPABILITY OF PRODUCING 
QUARTER SIZE HAIL AND DESTRUCTIVE WINDS OVER 70 MPH.

A NEW SEVERE THUNDERSTORM WARNING WILL BE ISSUED SOON FOR THESE 
STORMS.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THESE STORMS.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY ON THE
LOWEST FLOOR OF A STURDY BUILDING...PREFERABLY IN AN INTERIOR HALLWAY
OR A ROOM SUCH AS A CLOSET OR BATHROOM.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY ON THE LOWEST
FLOOR OF A STURDY BUILDING...PREFERABLY IN AN INTERIOR HALLWAY OR A
ROOM SUCH AS A CLOSET OR BATHROOM.

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

LAT...LON 3206 8811 3201 8811 3201 8763 3214 8762
      3215 8753 3228 8751 3215 8725 3074 8843
      3073 8886 3068 8888 3067 8899 3068 8932
      3130 8889 3231 8793
TIME...MOT...LOC 0112Z 268DEG 38KT 3233 8751 3067 8906

$$

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, 7:38 PM CDT	Tornado Warning	MOB	Washington	56 min
Apr 4, 7:54 PM CDT	Tornado Warning	MOB	Choctaw, Clarke, Washington	53 min
Apr 4, 8:21 PM CDT	Tornado Warning	MOB	Clarke, Monroe, Washington	39 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

Severe Thunderstorm Warnings in Alabama, 2011 Severe Thunderstorm Warnings in Mississippi, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.