Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 218, NWS Mobile, AL

December 10, 2012Clarke County, Conecuh County, Monroe County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Dec 10, 2012, 12:30 PM CST for Clarke County, Conecuh County, Monroe County, Alabama. It was in force for 28 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, 12:30 PM CST (18:30 UTC)
Expired: Dec 10, 2012, 12:58 PM CST
In force: 28 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Clarke County, AL, Conecuh County, AL, Monroe County, AL

The radar

The Mobile radar (KMOB), 119 km from the middle of the area, began a volume at 18:34 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

Birmingham, AL (KBMX), launched 12:00Z, 6.5 hours before the alert went out and 195 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: 385 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 531 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 218 m²/s²
0-3 km storm-relative helicity: 254 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.7

Open this sounding in Storm Lab

The text

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

302 
WUUS54 KMOB 101830
SVRMOB
ALC025-035-099-101930-
/O.NEW.KMOB.SV.W.0218.121210T1830Z-121210T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1230 PM CST MON DEC 10 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN CONECUH COUNTY IN SOUTH CENTRAL ALABAMA...
  CENTRAL MONROE COUNTY IN SOUTH CENTRAL ALABAMA...
  EAST CENTRAL CLARKE COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 130 PM CST

* AT 1229 PM CST...A LINE OF SEVERE THUNDERSTORMS CAPABLE OF
  PRODUCING DAMAGING WINDS OVER 60 MPH WERE LOCATED ALONG A LINE
  EXTENDING FROM 13 MILES EAST OF GROVE HILL TO 12 MILES SOUTHWEST OF
  FRISCO CITY...AND MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  URIAH...              MONROEVILLE...        MEGARGEL...
  FRISCO CITY...        EXCEL...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3181 8733 3129 8727 3124 8761 3124 8764
      3178 8765
TIME...MOT...LOC 1830Z 270DEG 37KT 3174 8755 3130 8752

$$

1 follow-up statement

239 
WWUS54 KMOB 101858
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1258 PM CST MON DEC 10 2012

ALC025-035-099-101908-
/O.CAN.KMOB.SV.W.0218.000000T0000Z-121210T1930Z/
CONECUH AL-MONROE AL-CLARKE AL-
1258 PM CST MON DEC 10 2012

...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED FOR EAST
CENTRAL CLARKE...WESTERN MONROE AND SOUTHWESTERN CONECUH COUNTIES...

AT 1257 PM CST...THE LINE OF STORMS THAT PROMPTED THE WARNING FOR 
EAST CENTRAL CLARKE...WESTERN MONROE AND SOUTHWESTERN CONECUH COUNTIES 
HAS WEAKENED TO BELOW SEVERE LIMITS...THUS THE SEVERE THUNDERSTORM 
WARNING HAS BEEN CANCELLED.

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

LAT...LON 3181 8733 3129 8727 3124 8761 3124 8764
      3178 8765
TIME...MOT...LOC 1858Z 270DEG 37KT 3174 8721 3130 8718

$$

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, 10:31 AM CST	Severe Thunderstorm Warning	MOB	Washington	49 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, 12:32 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.