Alert archive / Alabama / Tornado Warnings in 2011

Tornado Warning 90, NWS Mobile, AL

September 3, 2011Mobile County, Alabama

NWS Mobile, AL issued this tornado warning at Sep 3, 2011, 12:53 PM CDT for Mobile County, Alabama. It was in force for 22 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
Sep 3, 2011, 12:53 PM CDT (17:53 UTC)
Expired
Sep 3, 2011, 1:15 PM CDT
In force
22 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Mobile County, AL

The radar

The Mobile radar (KMOB), 48 km from the middle of the area, began a volume at 17:57 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
Sep 3, 9:41 AM CDTTornado WatchSPC12 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.9 hours before the alert went out and 146 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 12:00Z on 2011-09-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 850 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2011-09-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 286 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
850 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
477 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
286 m²/s²
0-3 km storm-relative helicity
260 m²/s²
Significant tornado parameter
1.0
Supercell composite
7.0

Open this sounding in Storm Lab

The text

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

535 
WFUS54 KMOB 031753
TORMOB
ALC097-031815-
/O.NEW.KMOB.TO.W.0090.110903T1753Z-110903T1815Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1253 PM CDT SAT SEP 3 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* TORNADO WARNING FOR...
  EXTREME SOUTH CENTRAL MOBILE COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 115 PM CDT

* AT 1253 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 9 MILES
  SOUTHEAST OF DAUPHIN ISLAND...OR 5 MILES SOUTH OF SAND ISLAND...
  MOVING NORTH AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RURAL EXTREME SOUTH CENTRAL MOBILE COUNTY

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 MANUFACTURED 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 1000 PM CDT SATURDAY EVENING
FOR SOUTHWEST ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

&&

LAT...LON 3024 8827 3027 8813 3029 8813 3029 8812
      3023 8810 3024 8817 3023 8825
TIME...MOT...LOC 1753Z 163DEG 26KT 3019 8813

$$
1 follow-up statement
033 
WWUS54 KMOB 031807
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
107 PM CDT SAT SEP 3 2011

ALC097-031818-
/O.EXP.KMOB.TO.W.0090.000000T0000Z-110903T1815Z/
MOBILE AL-
107 PM CDT SAT SEP 3 2011

...THE TORNADO WARNING FOR EXTREME SOUTH CENTRAL MOBILE COUNTY WILL
EXPIRE AT 115 PM CDT...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT SATURDAY EVENING
FOR SOUTHWEST ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

LAT...LON 3024 8827 3027 8813 3029 8813 3029 8812
      3023 8810 3024 8817 3023 8825
TIME...MOT...LOC 1808Z 163DEG 26KT 3029 8817

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 2, 10:37 PM CDTTropical Storm WarningMOB47 hr
Sep 3, 1:44 AM CDTSpecial Marine WarningMOB46 min
Sep 3, 2:13 AM CDTSpecial Marine WarningMOB47 min
Sep 3, 3:38 AM CDTSpecial Marine WarningMOB22 min
Sep 3, 4:00 AM CDTSpecial Marine WarningMOB30 min
Sep 3, 4:31 AM CDTSpecial Marine WarningMOB44 min
Sep 3, 9:15 AM CDTRiver Flood WarningMOBBaldwin24 hr
Sep 3, 9:16 AM CDTRiver Flood WarningMOBBaldwin24 hr
Sep 3, 9:19 AM CDTRiver Flood WarningMOBBaldwin24 hr
Sep 3, 10:59 AM CDTSpecial Marine WarningMOB46 min
Sep 3, 12:14 PM CDTSpecial Marine WarningMOB46 min
Sep 3, 1:00 PM CDTSpecial Marine WarningMOB21 min
Sep 3, 1:29 PM CDTSpecial Marine WarningMOB61 min
Sep 3, 1:50 PM CDTRiver Flood WarningMOBMobile31 hr
Sep 3, 2:00 PM CDTTornado WarningMOBMobile16 min
Sep 3, 2:14 PM CDTTornado WarningMOBMobile33 min
Sep 3, 2:19 PM CDTFlash Flood WarningMOBMobile4 hr
Sep 3, 4:10 PM CDTSpecial Marine WarningMOB15 min
Sep 3, 4:53 PM CDTFlash Flood WarningMOBMobile3 hr
Sep 3, 5:00 PM CDTSpecial Marine WarningMOB45 min
Sep 3, 5:33 PM CDTSpecial Marine WarningMOB42 min
Sep 3, 6:06 PM CDTSpecial Marine WarningMOB39 min
Sep 3, 6:09 PM CDTTornado WarningMOBMobile51 min

Nearby

Tornado 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.