Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 213, NWS Mobile, AL

December 10, 2012Washington County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Dec 10, 2012, 10:31 AM CST for Washington County, Alabama. It was in force for 49 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 10, 2012, 10:31 AM CST (16:31 UTC)
Expired: Dec 10, 2012, 11:20 AM CST
In force: 49 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Washington County, AL

The radar

The Mobile radar (KMOB), 89 km from the middle of the area, began a volume at 16:34 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 10, 8:51 AM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.5 hours before the alert went out and 196 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: 767 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 488 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 237 m²/s²
0-3 km storm-relative helicity: 263 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 7.9

Open this sounding in Storm Lab

The text

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

774 
WUUS54 KMOB 101631
SVRMOB
ALC129-101730-
/O.NEW.KMOB.SV.W.0213.121210T1631Z-121210T1730Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1031 AM CST MON DEC 10 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WASHINGTON COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 1130 AM CST

* AT 1025 AM CST...A LINE OF SEVERE THUNDERSTORMS CAPABLE OF         
  PRODUCING DAMAGING WINDS OVER 60 MPH WAS LOCATED FROM 12           
  MILES EAST OF WAYNESBORO TO 14 MILES SOUTHWEST OF 
  CHATOM...MOVING EAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  TIBBIE...             MILLRY...             FRUITDALE...
  CHATOM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 PM CST MONDAY AFTERNOON
FOR SOUTHWESTERN ALABAMA AND SOUTHEAST MISSISSIPPI.

&&

LAT...LON 3134 8810 3134 8843 3170 8846 3170 8811
TIME...MOT...LOC 1629Z 268DEG 34KT 3172 8841 3136 8842

$$

1 follow-up statement

242 
WWUS54 KMOB 101720
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1120 AM CST MON DEC 10 2012

ALC129-101729-
/O.CAN.KMOB.SV.W.0213.000000T0000Z-121210T1730Z/
WASHINGTON AL-
1120 AM CST MON DEC 10 2012

...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED FOR
NORTHWESTERN WASHINGTON COUNTY...

AT 1116 AM CST...THE LINE OF STORMS THAT PROMPTED THE WARNING FOR 
NORTHWESTERN WASHINGTON HAS MOVED OUT OF THE COUNTY...THUS THE SEVERE 
THUNDERSTORM WARNING HAS BEEN CANCELLED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 PM CST MONDAY AFTERNOON
FOR SOUTHWESTERN ALABAMA AND SOUTHEAST MISSISSIPPI.

LAT...LON 3134 8810 3134 8843 3170 8846 3170 8811
TIME...MOT...LOC 1719Z 268DEG 34KT 3174 8786 3138 8787

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 10, 3:51 AM CST	Small Craft Advisory	MOB		29 hr
Dec 10, 9:43 AM CST	Special Marine Warning	MOB		2 hr
Dec 10, 9:53 AM CST	Severe Thunderstorm Warning	MOB	Choctaw	52 min
Dec 10, 10:03 AM CST	Tornado Warning	MOB	Baldwin	42 min
Dec 10, 10:36 AM CST	Tornado Warning	MOB	Choctaw, Washington	40 min
Dec 10, 10:37 AM CST	Tornado Warning	MOB	Baldwin	38 min
Dec 10, 10:58 AM CST	Tornado Warning	MOB	Clarke	41 min
Dec 10, 11:32 AM CST	Severe Thunderstorm Warning	MOB	Mobile, Washington	42 min
Dec 10, 11:36 AM CST	Severe Thunderstorm Warning	MOB	Clarke, Monroe, Wilcox	54 min
Dec 10, 12:09 PM CST	Severe Thunderstorm Warning	MOB	Baldwin, Clarke, Monroe	47 min
Dec 10, 12:18 PM CST	Severe Thunderstorm Warning	MOB	Butler, Monroe, Wilcox	42 min
Dec 10, 12:30 PM CST	Severe Thunderstorm Warning	MOB	Clarke, Conecuh, Monroe	28 min
Dec 10, 12:32 PM CST	Severe Thunderstorm Warning	MOB	Butler, Wilcox	29 min
Dec 10, 12:37 PM CST	Special Marine Warning	MOB		92 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2012 Every severe thunderstorm warning 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.