Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 51, NWS Mobile, AL

April 16, 20114 counties in Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Apr 16, 2011, 12:00 AM CDT for 4 counties in Alabama. It was in force for 60 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 16, 2011, 12:00 AM CDT (05:00 UTC)
Expired
Apr 16, 2011, 1:00 AM CDT
In force
60 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

Counties Butler County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL

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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 5.0 hours before the alert went out and 234 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, Tallahassee Rgnl, FL at 00:00Z on 2011-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 00:00Z on 2011-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1577 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
78 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

414 
WUUS54 KMOB 160500
SVRMOB
ALC013-035-039-041-160600-
/O.NEW.KMOB.SV.W.0051.110416T0500Z-110416T0600Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1200 AM CDT SAT APR 16 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN BUTLER COUNTY IN SOUTH CENTRAL ALABAMA...
  EASTERN CONECUH COUNTY IN SOUTH CENTRAL ALABAMA...
  THIS INCLUDES THE CITY OF EVERGREEN...
  NORTHERN COVINGTON COUNTY IN SOUTH CENTRAL ALABAMA...
  SOUTHERN CRENSHAW COUNTY IN SOUTH CENTRAL ALABAMA...

* UNTIL 100 AM CDT

* AT 1158 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 8 MILES SOUTHWEST OF GEORGIANA TO 10 MILES SOUTH OF GEORGIANA
  TO 10 MILES EAST OF EVERGREEN TO 6 MILES SOUTH OF EVERGREEN...AND
  MOVING EAST AT 65 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  SOUTH AROUND 1210 AM CDT...
  RED LEVEL AROUND 1215 AM CDT...
  RIVER FALLS AND GANTT AROUND 1220 AM CDT...
  HEATH...DOZIER...BRANTLEY AND GANTT AROUND 1225 AM CDT...
  GLENWOOD AROUND 1235 AM CDT...

THIS INCLUDES INTERSTATE 65 BETWEEN MILE MARKERS 103 AND 108.

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 3153 8616 3153 8619 3133 8619 3135 8706
      3150 8691 3158 8690 3173 8614 3167 8614
      3163 8617 3162 8614 3155 8614
TIME...MOT...LOC 0500Z 257DEG 56KT 3157 8682 3150 8671
          3144 8675 3136 8689

$$
1 follow-up statement
114 
WWUS54 KMOB 160508
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1208 AM CDT SAT APR 16 2011

ALC013-035-039-041-160600-
/O.CON.KMOB.SV.W.0051.000000T0000Z-110416T0600Z/
COVINGTON AL-CONECUH AL-BUTLER AL-CRENSHAW AL-
1208 AM CDT SAT APR 16 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM CDT
FOR SOUTHERN CRENSHAW...SOUTH CENTRAL BUTLER...EAST CENTRAL CONECUH
AND NORTHERN COVINGTON COUNTIES...

AT 1203 AM CDT...NATIONAL WEATHER SERVICE RADAR CONTINUED TO INDICATE
A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING NICKEL SIZE 
HAIL...AND DAMAGING WINDS OVER 60 TO 70 MPH.  THESE STORMS WERE 
ALONG A LINE EXTENDING FROM GEORGIANA TO 11 MILES SOUTH OF GEORGIANA 
TO 9 MILES SOUTHEAST OF EVERGREEN...MOVING EAST AT 35 TO 40 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  SHELL...MELROSE AND COHASSETT AROUND 1215 AM CDT...
  INDUSTRY AND SOUTH AROUND 1220 AM CDT...
  OAKY STREAK AND RED LEVEL AROUND 1225 AM CDT...
  RHUMP AND RIVER FALLS AROUND 1230 AM CDT...
  RAWLS AROUND 1235 AM 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.

LAT...LON 3153 8616 3153 8619 3133 8619 3135 8688
      3145 8691 3160 8680 3173 8614 3167 8614
      3163 8617 3162 8614 3155 8614
TIME...MOT...LOC 0508Z 261DEG 31KT 3159 8674 3149 8671
          3136 8679

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 15, 7:14 PM CDTTornado WarningMOBWashington36 min
Apr 15, 7:24 PM CDTTornado Warning EmergencyMOBMobile, Washington51 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, 8:28 PM CDTTornado WarningMOBWashington47 min
Apr 15, 8:50 PM CDTTornado WarningMOBBaldwin, Clarke, Escambia, Mobile, Monroe, Washington55 min
Apr 15, 9:15 PM CDTSevere Thunderstorm WarningMOBClarke, Mobile, Washington45 min
Apr 15, 9:18 PM CDTFlash Flood WarningMOBWashington117 min
Apr 15, 9:38 PM CDTTornado WarningMOBConecuh, Monroe52 min
Apr 15, 9:41 PM CDTTornado WarningMOBClarke, Washington49 min
Apr 15, 9:59 PM CDTSevere Thunderstorm WarningMOBBaldwin, Clarke, Mobile, Monroe, Washington61 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, 12:11 AM CDTSevere Thunderstorm WarningMOBCrenshaw32 min
Apr 16, 12:38 AM CDTTornado WarningMOBCovington52 min
Apr 16, 1:01 AM CDTSevere Thunderstorm WarningMOBCovington33 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2011Every 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; the sounding from the Mesonet's radiosonde archive.