Alert archive / Mississippi / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 47, NWS Mobile, AL

April 15, 2011Clarke County, Mobile County, Washington County, Alabama; 4 counties in Mississippi

NWS Mobile, AL issued this severe thunderstorm warning at Apr 15, 2011, 9:15 PM CDT for Clarke County, Mobile County, Washington County, Alabama; 4 counties in Mississippi. It was in force for 45 min. 1 report 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 15, 2011, 9:15 PM CDT (02:15 UTC)
Expired: Apr 15, 2011, 10:00 PM CDT
In force: 45 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

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

The radar

The Mobile radar (KMOB), 41 km from the middle of the area, began a volume at 02:17 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 15, 10:07 PM CDT	TORNADO	Citronelle, AL	MOBILE EMA REPORTS ROOFS OFF HOMES AND MOBILE HOMES DAMAGED. LARGE TREES AND POWER LINES DOWN ACROSS ROADS. NO KNOWN INURIES AT THIS TIME.

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 15, 7:48 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 2.3 hours before the alert went out and 152 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: 2774 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 697 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 267 m²/s²
0-3 km storm-relative helicity: 318 m²/s²
Significant tornado parameter: 5.3
Supercell composite: 18.2

Open this sounding in Storm Lab

The text

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

631 
WUUS54 KMOB 160215
SVRMOB
ALC025-097-129-MSC039-041-111-131-160300-
/O.NEW.KMOB.SV.W.0047.110416T0215Z-110416T0300Z/

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

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GEORGE COUNTY IN SOUTHEAST MISSISSIPPI...
  SOUTHEASTERN GREENE COUNTY IN SOUTHEAST MISSISSIPPI...
  SOUTHERN PERRY COUNTY IN SOUTHEAST MISSISSIPPI...  
  STONE COUNTY IN SOUTHEAST MISSISSIPPI...
  SOUTH CENTRAL CLARKE COUNTY IN SOUTHWEST ALABAMA...  
  NORTHERN MOBILE COUNTY IN SOUTHWEST ALABAMA...
  SOUTHERN WASHINGTON COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 1000 PM CDT

* AT 912 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 9 MILES NORTHEAST OF LEAKESVILLE TO 9 MILES SOUTHEAST OF      
  LEAKESVILLE TO 6 MILES WEST OF WIGGINS...AND MOVING EAST AT 55 TO  
  60 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  CITRONELLE AND LUCEDALE AROUND 925 PM CDT...
  PINEOLA AROUND 930 PM CDT...
  MCINTOSH AND MOUNT VERNON AROUND 935 PM CDT...
  BASIN AROUND 945 PM CDT...
  CREOLA...OAK GROVE...LOTT AND COLEMAN D AND I65 AND US 43 AROUND
  1000 PM CDT...

THIS INCLUDES INTERSTATE 65 BETWEEN MILE MARKERS 7 AND 24.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT SATURDAY MORNING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

&&

LAT...LON 3091 8932 3092 8914 3102 8914 3099 8892
      3104 8863 3136 8862 3146 8793 3134 8784
      3127 8793 3116 8797 3115 8794 3109 8797
      3098 8797 3095 8793 3089 8800 3084 8795
      3080 8802 3071 8801 3075 8934
TIME...MOT...LOC 0214Z 270DEG 56KT 3126 8844 3105 8843
          3094 8869 3084 8920

$$

2 follow-up statements

081 
WWUS54 KMOB 160239
SVSMOB

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

ALC025-097-129-MSC039-041-111-131-160300-
/O.CON.KMOB.SV.W.0047.000000T0000Z-110416T0300Z/
WASHINGTON AL-CLARKE AL-GEORGE MS-STONE MS-PERRY MS-GREENE MS-
MOBILE AL-
939 PM CDT FRI APR 15 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT
FOR NORTHERN MOBILE...SOUTHERN GREENE...SOUTHERN PERRY...STONE...
GEORGE...SOUTH CENTRAL CLARKE AND SOUTHERN WASHINGTON COUNTIES...

AT 935 PM CDT...NATIONAL WEATHER SERVICE RADAR CONTINUED TO INDICATE
A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS OVER 60 MPH.  THESE STORMS WERE ALONG A 
LINE EXTENDING FROM 7 MILES SOUTHWEST OF JACKSON TO 10 MILES 
NORTHEAST OF CITRONELLE TO 12 MILES WEST OF WIGGINS...MOVING EAST 
AT 50 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  MOUNT VERNON...FORT STODDARD...WHITES CROSSING AND BIG LEVEL AROUND
  945 PM CDT...
  DEEP CREEK AND LAMBERT GROVE AROUND 950 PM CDT...
  BENNDALE AND CROSSROADS AROUND 955 PM CDT...
  PINEOLA AND BEXLEY AROUND 1000 PM CDT...

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 300 AM CDT SATURDAY MORNING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

LAT...LON 3091 8932 3092 8914 3101 8886 3104 8863
      3108 8863 3120 8852 3139 8840 3146 8793
      3134 8784 3127 8793 3116 8797 3115 8794
      3110 8797 3098 8797 3095 8793 3089 8800
      3084 8795 3080 8802 3071 8801 3075 8934
TIME...MOT...LOC 0238Z 257DEG 86KT 3146 8789 3117 8800
          3102 8822 3084 8925

$$

888 
WWUS54 KMOB 160250
SVSMOB

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

ALC025-097-129-MSC039-041-111-131-160300-
/O.CON.KMOB.SV.W.0047.000000T0000Z-110416T0300Z/
WASHINGTON AL-CLARKE AL-GEORGE MS-STONE MS-PERRY MS-GREENE MS-
MOBILE AL-
950 PM CDT FRI APR 15 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT 
FOR NORTHERN MOBILE...SOUTHERN GREENE...SOUTHERN PERRY... 
STONE...GEORGE...SOUTH CENTRAL CLARKE AND SOUTHERN WASHINGTON 
COUNTIES...

AT 944 PM CDT...CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND 
DAMAGING WINDS OVER 60 MPH.  THESE STORMS WERE ALONG A LINE 
EXTENDING FROM 10 MILES EAST OF CHATOM TO CITRONELLE TO 10 MILES 
WEST OF WIGGINS...MOVING EAST AT 55 TO 60 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  WHITES CROSSING...MOUNT VERNON...CALVERT AND MALCOLM AROUND 955 PM
  CDT...
  PINEOLA...MERRILL...RUSSELL AND SIDNEY AROUND 1000 PM CDT...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT SATURDAY MORNING
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

LAT...LON 3091 8927 3092 8914 3101 8886 3104 8863
      3108 8863 3119 8846 3138 8835 3146 8793
      3134 8784 3127 8793 3116 8797 3115 8794
      3110 8797 3098 8797 3095 8793 3089 8800
      3084 8795 3080 8802 3071 8801 3075 8934
TIME...MOT...LOC 0248Z 259DEG 61KT 3145 8801 3104 8816
          3102 8832 3088 8923

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 7:14 PM CDT	Tornado Warning	MOB	Washington	36 min
Apr 15, 7:24 PM CDT	Tornado Warning Emergency	MOB	Mobile, Washington	51 min
Apr 15, 7:36 PM CDT	Severe Thunderstorm Warning	MOB	Wilcox	39 min
Apr 15, 7:39 PM CDT	Tornado Warning	MOB	Clarke, Monroe, Wilcox	29 min
Apr 15, 7:54 PM CDT	Tornado Warning	MOB	Clarke, Monroe, Wilcox	51 min
Apr 15, 8:11 PM CDT	Tornado Warning Emergency	MOB	Washington	49 min
Apr 15, 8:28 PM CDT	Tornado Warning	MOB	Washington	47 min
Apr 15, 8:50 PM CDT	Tornado Warning	MOB	Baldwin, Clarke, Escambia, Mobile, Monroe, Washington	55 min
Apr 15, 9:18 PM CDT	Flash Flood Warning	MOB	Washington	117 min
Apr 15, 9:38 PM CDT	Tornado Warning	MOB	Conecuh, Monroe	52 min
Apr 15, 9:41 PM CDT	Tornado Warning	MOB	Clarke, Washington	49 min
Apr 15, 9:59 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Clarke, Mobile, Monroe, Washington	61 min
Apr 15, 10:05 PM CDT	Tornado Warning	MOB	Baldwin, Clarke, Mobile, Monroe, Washington	55 min
Apr 15, 10:24 PM CDT	Tornado Warning	MOB	Butler, Clarke, Conecuh, Monroe, Wilcox	51 min
Apr 15, 10:32 PM CDT	Tornado Warning	MOB	Baldwin, Mobile	33 min
Apr 15, 10:56 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Conecuh, Escambia, Mobile, Monroe	64 min
Apr 15, 10:59 PM CDT	Tornado Warning	MOB	Baldwin, Conecuh, Escambia, Monroe	61 min
Apr 15, 11:10 PM CDT	Tornado Warning	MOB	Butler, Crenshaw	16 min
Apr 15, 11:33 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Crenshaw	42 min
Apr 15, 11:45 PM CDT	Tornado Warning	MOB	Conecuh, Covington, Escambia	60 min
Apr 16, 12:00 AM CDT	Severe Thunderstorm Warning	MOB	Butler, Conecuh, Covington, Crenshaw	60 min
Apr 16, 12:11 AM CDT	Severe Thunderstorm Warning	MOB	Crenshaw	32 min
Apr 16, 12:38 AM CDT	Tornado Warning	MOB	Covington	52 min
Apr 16, 1:01 AM CDT	Severe Thunderstorm Warning	MOB	Covington	33 min
Apr 15, 7:53 PM CDT	Tornado Warning	MOB	Greene, Perry	37 min
Apr 15, 8:36 PM CDT	Tornado Warning	MOB	Greene, Perry	54 min
Apr 15, 8:42 PM CDT	Tornado Warning	MOB	George, Greene, Perry	63 min

Nearby

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