Alert archive / Alabama / Tornado Warnings in 2012

Tornado Warning 28, NWS Mobile, AL

May 12, 2012Greene County, Mississippi; Mobile County, Washington County, Alabama

NWS Mobile, AL issued this tornado warning at May 12, 2012, 12:55 PM CDT for Greene County, Mississippi; Mobile County, Washington County, Alabama. It was in force for 50 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
May 12, 2012, 12:55 PM CDT (17:55 UTC)
Expired
May 12, 2012, 1:45 PM CDT
In force
50 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

Counties Mobile County, AL, Washington County, AL, Greene County, MS

The radar

The Mobile radar (KMOB), 57 km from the middle of the area, began a volume at 17:58 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 nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.9 hours before the alert went out and 171 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 2012-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1685 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 2012-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 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
1685 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
500 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
118 m²/s²
0-3 km storm-relative helicity
201 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.7

Open this sounding in Storm Lab

The text

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

570 
WFUS54 KMOB 121755
TORMOB
ALC097-129-MSC041-121845-
/O.NEW.KMOB.TO.W.0028.120512T1755Z-120512T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1255 PM CDT SAT MAY 12 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN GREENE COUNTY IN SOUTHEAST MISSISSIPPI...
  NORTHWESTERN MOBILE COUNTY IN SOUTHWEST ALABAMA...
  SOUTHERN WASHINGTON COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 145 PM CDT

* AT 1254 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 8 MILES SOUTHEAST OF LEAKESVILLE...OR 14 MILES
  SOUTHWEST OF DEER PARK...MOVING NORTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SIMS CHAPEL...        MCINTOSH...           MALCOLM...
  FAIRFORD...           DEER PARK...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR OF A STURDY BUILDING.

&&

LAT...LON 3142 8812 3121 8796 3099 8842 3100 8852
      3110 8860
TIME...MOT...LOC 1756Z 236DEG 25KT 3108 8846

$$
1 follow-up statement
807 
WWUS54 KMOB 121830
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
130 PM CDT SAT MAY 12 2012

ALC097-MSC041-121839-
/O.CAN.KMOB.TO.W.0028.000000T0000Z-120512T1845Z/
GREENE MS-MOBILE AL-
130 PM CDT SAT MAY 12 2012

...THE TORNADO WARNING HAS BEEN CANCELLED FOR NORTHWESTERN MOBILE AND
SOUTHEASTERN GREENE COUNTIES...

AT 126 PM CDT...THE STORM THAT PROMPTED THE WARNING FOR NORTHWESTERN 
MOBILE AND SOUTHEASTERN GREENE COUNTIES HAS MOVED OUT OF THE COUNTY 
THUS THE TORNADO WARNING HAS BEEN CANCELLED.

LAT...LON 3113 8839 3120 8842 3142 8812 3124 8799
TIME...MOT...LOC 1829Z 236DEG 25KT 3116 8837

$$

ALC129-121845-
/O.CON.KMOB.TO.W.0028.000000T0000Z-120512T1845Z/
WASHINGTON AL-
130 PM CDT SAT MAY 12 2012

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 145 PM CDT FOR SOUTHERN
WASHINGTON COUNTY...

AT 126 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 
WAS LOCATED 10 MILES NORTHWEST OF CITRONELLE...OR 6 MILES SOUTHWEST
OF DEER PARK...MOVING NORTHEAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  SIMS CHAPEL...        MCINTOSH...           DEER PARK...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR OF A STURDY BUILDING.

&&

LAT...LON 3113 8839 3120 8842 3142 8812 3124 8799
TIME...MOT...LOC 1829Z 236DEG 25KT 3116 8837

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 12, 11:20 AM CDTSevere Thunderstorm WarningMOBStone40 min
May 12, 11:44 AM CDTTornado WarningMOBPerry, Stone46 min
May 12, 12:23 PM CDTSevere Thunderstorm WarningMOBPerry52 min
May 12, 12:31 PM CDTSevere Thunderstorm WarningMOBGreene59 min
May 12, 2:28 PM CDTSevere Thunderstorm WarningMOBWashington41 min

Nearby

Tornado Warnings in Alabama, 2012Tornado Warnings in Mississippi, 2012Every tornado warning in 2012Tornadoes in 2012

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.