Alert archive / Alabama / Mesoscale Discussions in 2012

Mesoscale Discussion 2150

December 10, 201224 counties in Alabama; 7 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Dec 10, 2012, 12:52 PM CST for 24 counties in Alabama; 7 counties in Florida. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
Dec 10, 2012, 12:52 PM CST (18:52 UTC)
Expired
Dec 10, 2012, 2:45 PM CST
In force
113 min
Issued by
the Storm Prediction Center
All 31 counties

Baldwin County, AL, Barbour County, AL, Bullock County, AL, Butler County, AL, Chambers County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Elmore County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Pike County, AL, Russell County, AL, Tallapoosa County, AL, Bay County, FL, Escambia County, FL, Holmes County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 6.9 hours before the alert went out and 166 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, Birmingham, AL at 12:00Z on 2012-12-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 385 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2012-12-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 218 square meters per square second.1939587897Sfc1 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
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.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 10, 7:31 AM CSTMesoscale DiscussionSPCChoctaw, Mobile, Washington119 min
Dec 10, 8:51 AM CSTTornado WatchSPCAutauga, Barbour, Bullock, Chambers, Chilton, Choctaw and 18 more6 hr
Dec 10, 10:24 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Bullock, Butler, Chambers, Chilton and 22 more2 hr
Dec 10, 3:40 PM CSTMesoscale DiscussionSPCBrevard, Citrus, DeSoto, Flagler, Hardee, Hernando and 19 more2 hr

Nearby

Mesoscale Discussions in Alabama, 2012Mesoscale Discussions in Florida, 2012Every mesoscale discussion 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.