Alert archive / Mississippi / Tornado Warnings in 2011

Tornado Warning 72, NWS Mobile, AL

April 15, 2011Greene County, Mississippi; Washington County, Alabama

NWS Mobile, AL issued this tornado warning at Apr 15, 2011, 8:28 PM CDT for Greene County, Mississippi; Washington County, Alabama. It was in force for 47 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, 8:28 PM CDT (01:28 UTC)
Expired
Apr 15, 2011, 9:15 PM CDT
In force
47 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

Counties Washington County, AL, Greene County, MS

The radar

The Mobile radar (KMOB), 62 km from the middle of the area, began a volume at 01:30 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 15, 7:48 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 1.5 hours before the alert went out and 149 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-pSkew-T log-p diagram, Slidell Radar S, LA at 00:00Z on 2011-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2774 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 00:00Z on 2011-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 267 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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.

804 
WFUS54 KMOB 160128
TORMOB
ALC129-MSC041-160215-
/O.NEW.KMOB.TO.W.0072.110416T0128Z-110416T0215Z/

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

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN GREENE COUNTY IN SOUTHEAST MISSISSIPPI...
  THIS INCLUDES THE CITY OF LEAKESVILLE...
  SOUTHWESTERN WASHINGTON COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 915 PM CDT

* AT 826 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 13 MILES WEST OF
  LEAKESVILLE...OR NEAR MCLAIN...MOVING NORTHEAST AT 35 MPH.

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

&&

LAT...LON 3117 8882 3143 8830 3113 8833 3112 8843
      3111 8844 3102 8881
TIME...MOT...LOC 0128Z 246DEG 29KT 3112 8876

$$
1 follow-up statement
861 
WWUS54 KMOB 160156
SVSMOB

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

ALC129-MSC041-160215-
/O.CON.KMOB.TO.W.0072.000000T0000Z-110416T0215Z/
WASHINGTON AL-GREENE MS-
856 PM CDT FRI APR 15 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR SOUTHERN
GREENE AND SOUTHWESTERN WASHINGTON COUNTIES...

AT 853 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS 
TORNADO WAS NEAR DUEITT...OR JUST NORTHEAST OF LEAKESVILLE...MOVING 
NORTHEAST AT 35 MPH.

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.

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

LAT...LON 3117 8882 3143 8830 3113 8833 3112 8843
      3111 8844 3102 8881
TIME...MOT...LOC 0156Z 246DEG 29KT 3122 8850

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 15, 7:14 PM CDTTornado WarningMOBGreene36 min
Apr 15, 7:24 PM CDTTornado Warning EmergencyMOBGreene, Perry51 min
Apr 15, 7:53 PM CDTTornado WarningMOBGreene, Perry37 min
Apr 15, 8:36 PM CDTTornado WarningMOBGreene, Perry54 min
Apr 15, 8:42 PM CDTTornado WarningMOBGeorge, Greene, Perry63 min
Apr 15, 9:15 PM CDTSevere Thunderstorm WarningMOBGeorge, Greene, Perry, Stone45 min
Apr 15, 9:18 PM CDTFlash Flood WarningMOBGreene, Perry117 min
Apr 15, 9:59 PM CDTSevere Thunderstorm WarningMOBGeorge, Greene61 min
Apr 15, 7:36 PM CDTSevere Thunderstorm WarningMOBWilcox39 min
Apr 15, 7:39 PM CDTTornado WarningMOBClarke, Monroe, Wilcox29 min
Apr 15, 7:54 PM CDTTornado WarningMOBClarke, Monroe, Wilcox51 min
Apr 15, 8:11 PM CDTTornado Warning EmergencyMOBWashington49 min
Apr 15, 8:50 PM CDTTornado WarningMOBBaldwin, Clarke, Escambia, Mobile, Monroe, Washington55 min
Apr 15, 9:38 PM CDTTornado WarningMOBConecuh, Monroe52 min
Apr 15, 9:41 PM CDTTornado WarningMOBClarke, Washington49 min
Apr 15, 10:05 PM CDTTornado WarningMOBBaldwin, Clarke, Mobile, Monroe, Washington55 min
Apr 15, 10:24 PM CDTTornado WarningMOBButler, Clarke, Conecuh, Monroe, Wilcox51 min
Apr 15, 10:32 PM CDTTornado WarningMOBBaldwin, Mobile33 min
Apr 15, 10:56 PM CDTSevere Thunderstorm WarningMOBBaldwin, Conecuh, Escambia, Mobile, Monroe64 min
Apr 15, 10:59 PM CDTTornado WarningMOBBaldwin, Conecuh, Escambia, Monroe61 min
Apr 15, 11:10 PM CDTTornado WarningMOBButler, Crenshaw16 min
Apr 15, 11:33 PM CDTSevere Thunderstorm WarningMOBButler, Crenshaw42 min
Apr 15, 11:45 PM CDTTornado WarningMOBConecuh, Covington, Escambia60 min
Apr 16, 12:00 AM CDTSevere Thunderstorm WarningMOBButler, Conecuh, Covington, Crenshaw60 min
Apr 16, 12:11 AM CDTSevere Thunderstorm WarningMOBCrenshaw32 min
Apr 16, 12:38 AM CDTTornado WarningMOBCovington52 min
Apr 16, 1:01 AM CDTSevere Thunderstorm WarningMOBCovington33 min

Nearby

Tornado Warnings in Mississippi, 2011Tornado Warnings in Alabama, 2011Every tornado warning in 2011Tornadoes 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.