Alert archive / Alabama / Tornado Warnings in 2012

Tornado Warning 56, NWS Mobile, AL

August 30, 2012Choctaw County, Washington County, Alabama

NWS Mobile, AL issued this tornado warning at Aug 30, 2012, 6:43 AM CDT for Choctaw County, Washington County, Alabama. It was in force for 37 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: Aug 30, 2012, 6:43 AM CDT (11:43 UTC)
Expired: Aug 30, 2012, 7:20 AM CDT
In force: 37 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Choctaw County, AL, Washington County, AL

The radar

The Mobile radar (KMOB), 110 km from the middle of the area, began a volume at 11:43 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
Aug 29, 11:42 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 11.7 hours before the alert went out and 178 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: 325 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 547 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 316 m²/s²
0-3 km storm-relative helicity: 370 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

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

372 
WFUS54 KMOB 301143
TORMOB
ALC023-129-301230-
/O.NEW.KMOB.TO.W.0056.120830T1143Z-120830T1230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOBILE AL
643 AM CDT THU AUG 30 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHWESTERN CHOCTAW COUNTY IN SOUTHWEST ALABAMA...
  NORTHWESTERN WASHINGTON COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 730 AM CDT

* AT 638 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 3 MILES SOUTH OF CHATOM...OR 4 MILES NORTH OF
  TIBBIE...MOVING NORTH AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SILAS...              MILLRY...             CHATOM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 AM CDT THURSDAY MORNING
FOR SOUTHWEST ALABAMA AND SOUTHEAST MISSISSIPPI.

&&

LAT...LON 3170 8846 3190 8846 3186 8826 3141 8823
      3139 8831
TIME...MOT...LOC 1144Z 172DEG 36KT 3148 8828

$$

1 follow-up statement

613 
WWUS54 KMOB 301220
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
720 AM CDT THU AUG 30 2012

ALC023-129-301230-
/O.CAN.KMOB.TO.W.0056.000000T0000Z-120830T1230Z/
CHOCTAW AL-WASHINGTON AL-
720 AM CDT THU AUG 30 2012

...THE TORNADO WARNING HAS BEEN CANCELLED FOR NORTHWESTERN WASHINGTON
AND SOUTHWESTERN CHOCTAW COUNTIES...

AT 715 AM CDT...THE STORM THAT PROMPTED THE WARNING FOR NORTHWESTERN 
WASHINGTON AND SOUTHWESTERN CHOCTAW COUNTIES HAS MOVED OUT OF THE 
COUNTY...THUS THE TORNADO WARNING HAS BEEN CANCELLED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 AM CDT THURSDAY MORNING
FOR SOUTHWEST ALABAMA AND SOUTHEAST MISSISSIPPI. A TORNADO WATCH ALSO
REMAINS IN EFFECT UNTIL 400 PM CDT THURSDAY AFTERNOON FOR
SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST MISSISSIPPI.

LAT...LON 3170 8846 3190 8846 3186 8826 3141 8823
      3139 8831
TIME...MOT...LOC 1220Z 172DEG 36KT 3184 8834

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 29, 7:27 PM CDT	Tornado Warning	MOB	Monroe, Wilcox	30 min
Aug 29, 7:29 PM CDT	Small Craft Advisory	MOB		33 hr
Aug 29, 7:45 PM CDT	Coastal Flood Warning	MOB		21 hr
Aug 30, 12:22 AM CDT	Flash Flood Warning	MOB	Mobile, Washington	6 hr
Aug 30, 12:52 AM CDT	Wind Advisory	MOB	Washington	16 hr
Aug 30, 2:28 AM CDT	Areal Flood Warning	MOB	Mobile, Washington	12 hr
Aug 30, 2:46 AM CDT	Tornado Warning	MOB	Covington	33 min
Aug 30, 3:53 AM CDT	Tornado Warning	MOB	Covington, Escambia	37 min
Aug 30, 4:09 AM CDT	Tornado Warning	MOB	Butler, Crenshaw	16 min
Aug 30, 4:31 AM CDT	Tornado Warning	MOB	Washington	29 min
Aug 30, 4:32 AM CDT	Tornado Warning	MOB	Covington	28 min
Aug 30, 7:41 AM CDT	Tornado Warning	MOB	Mobile	33 min
Aug 30, 8:10 AM CDT	Tornado Warning	MOB	Choctaw, Washington	35 min
Aug 30, 8:13 AM CDT	Tornado Warning	MOB	Washington	32 min
Aug 30, 8:45 AM CDT	Tornado Warning	MOB	Choctaw, Washington	45 min
Aug 30, 9:01 AM CDT	Tornado Warning	MOB	Mobile, Washington	44 min
Aug 30, 10:16 AM CDT	Tornado Warning	MOB	Choctaw, Washington	44 min
Aug 30, 10:56 AM CDT	Tornado Warning	MOB	Choctaw	49 min
Aug 30, 11:32 AM CDT	Severe Thunderstorm Warning	MOB	Mobile	43 min
Aug 30, 11:44 AM CDT	Flash Flood Warning	MOB	Mobile, Washington	6 hr
Aug 30, 11:56 AM CDT	Tornado Warning	MOB	Choctaw	33 min
Aug 30, 4:29 PM CDT	High Surf Advisory	MOB		20 hr

Nearby

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