Alert archive / Alabama / Tornado Warnings in 2011

Tornado Warning 151, NWS Mobile, AL

December 22, 2011Mobile County, Alabama

NWS Mobile, AL issued this tornado warning at Dec 22, 2011, 12:37 PM CST for Mobile County, Alabama. It was in force for 11 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: Dec 22, 2011, 12:37 PM CST (18:37 UTC)
Expired: Dec 22, 2011, 12:48 PM CST
In force: 11 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Mobile County, AL

The radar

The Mobile radar (KMOB), 49 km from the middle of the area, began a volume at 18:38 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.

Issued	Product	Office	Lasted
Dec 22, 10:00 AM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.6 hours before the alert went out and 151 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: 578 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 476 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 244 m²/s²
0-3 km storm-relative helicity: 297 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

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

791 
WFUS54 KMOB 221837
TORMOB
ALC097-221900-
/O.NEW.KMOB.TO.W.0151.111222T1837Z-111222T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1237 PM CST THU DEC 22 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 100 PM CST

* AT 1234 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 5 MILES
  SOUTHEAST OF DAUPHIN ISLAND...OR 3 MILES SOUTHWEST OF SAND
  ISLAND...MOVING NORTHEAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ALABAMA PORT...       FORT GAINES...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT USE HIGHWAY OVERPASSES FOR SHELTER. OVERPASSES DO NOT PROVIDE
PROTECTION FROM TORNADIC WINDS. VEHICLES STOPPED UNDER BRIDGES BLOCK
TRAFFIC AND PREVENT PEOPLE FROM GETTING OUT OF THE STORM'S PATH AND
TO SHELTER. IF YOU CANNOT DRIVE AWAY FROM THE TORNADO...GET OUT OF
YOUR VEHICLE AND LIE FLAT IN A DITCH AS A LAST RESORT.

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW! IF YOU WAIT
TO SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 PM CST THURSDAY AFTERNOON
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

&&

LAT...LON 3024 8813 3025 8819 3026 8819 3026 8813
      3029 8813 3026 8807 3024 8808 3023 8809
TIME...MOT...LOC 1837Z 217DEG 40KT 3023 8813

$$

1 follow-up statement

989 
WWUS54 KMOB 221848
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1248 PM CST THU DEC 22 2011

ALC097-221859-
/O.CAN.KMOB.TO.W.0151.000000T0000Z-111222T1900Z/
MOBILE AL-
1248 PM CST THU DEC 22 2011

...THE TORNADO WARNING FOR EXTREME SOUTH CENTRAL MOBILE COUNTY IS
CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 PM CST THURSDAY AFTERNOON
FOR SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

LAT...LON 3023 8809 3023 8811 3024 8813 3025 8819
      3026 8819 3026 8813 3029 8813 3026 8807
      3024 8808
TIME...MOT...LOC 1849Z 217DEG 40KT 3034 8804

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 22, 5:10 AM CST	Small Craft Advisory	MOB		14 hr
Dec 22, 11:08 AM CST	Tornado Warning	MOB	Washington	52 min
Dec 22, 11:11 AM CST	Special Marine Warning	MOB		49 min
Dec 22, 11:59 AM CST	Tornado Warning	MOB	Clarke	22 min
Dec 22, 12:04 PM CST	Special Marine Warning	MOB		86 min
Dec 22, 12:57 PM CST	Tornado Warning	MOB	Baldwin	21 min
Dec 22, 1:28 PM CST	Severe Thunderstorm Warning	MOB	Conecuh, Escambia	32 min
Dec 22, 1:34 PM CST	Tornado Warning	MOB	Conecuh, Escambia	26 min
Dec 22, 1:47 PM CST	Severe Thunderstorm Warning	MOB	Butler	13 min
Dec 22, 2:56 PM CST	Tornado Warning	MOB	Crenshaw	19 min
Dec 22, 4:34 PM CST	Special Marine Warning	MOB		41 min

Nearby

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