Alert archive / Alabama / Tornado Warnings in 2011

Tornado Warning 109, NWS Mobile, AL

September 4, 2011Baldwin County, Mobile County, Alabama

NWS Mobile, AL issued this tornado warning at Sep 4, 2011, 11:46 AM CDT for Baldwin County, Mobile County, Alabama. It was in force for 19 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 4, 2011, 11:46 AM CDT (16:46 UTC)
Expired
Sep 4, 2011, 12:05 PM CDT
In force
19 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

Counties Baldwin County, AL, Mobile County, AL

The radar

The Mobile radar (KMOB), 22 km from the middle of the area, began a volume at 16:49 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 4, 5:05 AM CDTTornado WatchSPC11 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.8 hours before the alert went out and 170 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 2011-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2528 joules per kilogram.LCLLFCEL10008507005003002001001 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, Slidell Radar S, LA at 12:00Z on 2011-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 249 square meters per square second.193958Sfc1 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
2528 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
473 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
249 m²/s²
0-3 km storm-relative helicity
287 m²/s²
Significant tornado parameter
3.0
Supercell composite
18.9

Open this sounding in Storm Lab

The text

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

639 
WFUS54 KMOB 041646
TORMOB
ALC003-097-041715-
/O.NEW.KMOB.TO.W.0109.110904T1646Z-110904T1715Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1146 AM CDT SUN SEP 4 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* TORNADO WARNING FOR...
  EXTREME WEST CENTRAL BALDWIN COUNTY IN SOUTHWEST ALABAMA...
  EAST CENTRAL MOBILE COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 1215 PM CDT

* AT 1139 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS
  TRACKING A TORNADO ON MOBILE BAY 6 MILES WEST OF SPANISH FORT...OR
  2 MILES SOUTHWEST OF I10 NEAR THE BATTLESHIP...MOVING NORTH AT 35 
  MPH. THIS TORNADO WAS ABOUT TO CROSS INTERSTATE 10 NEAR THE 
  BATTLESHIP. 

* LOCATIONS IMPACTED INCLUDE...
  CHICKASAW...

THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 25 AND 30.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 PM CDT SUNDAY AFTERNOON 
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST 
MISSISSIPPI.

&&

LAT...LON 3080 8808 3081 8801 3081 8796 3065 8793
      3065 8794 3068 8801 3064 8803 3064 8806
TIME...MOT...LOC 1645Z 185DEG 30KT 3071 8801

$$
1 follow-up statement
278 
WWUS54 KMOB 041705
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1205 PM CDT SUN SEP 4 2011

ALC003-097-041714-
/O.CAN.KMOB.TO.W.0109.000000T0000Z-110904T1715Z/
BALDWIN AL-MOBILE AL-
1205 PM CDT SUN SEP 4 2011

...THE TORNADO WARNING FOR EAST CENTRAL MOBILE AND EXTREME WEST
CENTRAL BALDWIN COUNTIES IS CANCELLED...

THE STORM THAT PROMPTED THE WARNING AND CROSSED INTERSTATE 10 HAS 
EXITED THE AREA AND HAS WEAKENED.  THEREFORE...THE WARNING IS 
CANCELLED. 

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 PM CDT SUNDAY AFTERNOON
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

LAT...LON 3080 8808 3081 8801 3081 8796 3065 8793
      3065 8794 3068 8801 3064 8803 3064 8806
TIME...MOT...LOC 1704Z 185DEG 30KT 3087 8799

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 3, 7:53 PM CDTAreal Flood WarningMOBBaldwin, Mobile6 hr
Sep 3, 8:02 PM CDTSpecial Marine WarningMOB43 min
Sep 3, 8:24 PM CDTSpecial Marine WarningMOB51 min
Sep 3, 9:11 PM CDTRiver Flood WarningMOBCovington, Escambia12 hr
Sep 3, 10:34 PM CDTSpecial Marine WarningMOB41 min
Sep 3, 11:11 PM CDTTornado WarningMOBMobile64 min
Sep 3, 11:58 PM CDTTornado WarningMOBMobile62 min
Sep 4, 12:13 AM CDTSpecial Marine WarningMOB2 hr
Sep 4, 12:59 AM CDTTornado WarningMOBMobile61 min
Sep 4, 1:14 AM CDTFlash Flood WarningMOBMobile3 hr
Sep 4, 1:40 AM CDTFlash Flood WarningMOBMobile3 hr
Sep 4, 1:59 AM CDTTornado WarningMOBMobile45 min
Sep 4, 2:16 AM CDTSpecial Marine WarningMOB119 min
Sep 4, 2:46 AM CDTTornado WarningMOBBaldwin59 min
Sep 4, 3:16 AM CDTSpecial Marine WarningMOB119 min
Sep 4, 3:57 AM CDTTornado WarningMOBBaldwin42 min
Sep 4, 4:49 AM CDTSpecial Marine WarningMOB86 min
Sep 4, 5:36 AM CDTFlash Flood WarningMOBCovington, Escambia3 hr
Sep 4, 5:51 AM CDTSpecial Marine WarningMOB114 min
Sep 4, 9:42 AM CDTSpecial Marine WarningMOB33 min
Sep 4, 9:59 AM CDTRiver Flood WarningMOBChoctaw, Clarke, Washington4 days
Sep 4, 9:59 AM CDTRiver Flood WarningMOBChoctaw, Clarke, Washington5 days
Sep 4, 10:43 AM CDTSpecial Marine WarningMOB47 min
Sep 4, 10:44 AM CDTSpecial Marine WarningMOB46 min
Sep 4, 11:29 AM CDTSpecial Marine WarningMOB46 min
Sep 4, 12:12 PM CDTTornado WarningMOBWashington63 min
Sep 4, 12:58 PM CDTTornado WarningMOBWashington62 min
Sep 4, 1:20 PM CDTTornado WarningMOBClarke, Washington55 min
Sep 4, 4:01 PM CDTTornado WarningMOBChoctaw, Clarke59 min
Sep 4, 4:09 PM CDTTornado WarningMOBWashington36 min
Sep 4, 4:15 PM CDTTornado WarningMOBBaldwin, Escambia60 min
Sep 4, 4:28 PM CDTTornado WarningMOBBaldwin49 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.