Alert archive / Alabama / Mesoscale Discussions in 2011

Mesoscale Discussion 2392

December 22, 20115 states

The Storm Prediction Center issued this mesoscale discussion at Dec 22, 2011, 2:51 PM CST for 5 states. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued
Dec 22, 2011, 2:51 PM CST (20:51 UTC)
Expired
Dec 22, 2011, 3:45 PM CST
In force
54 min
Issued by
the Storm Prediction Center
All 68 counties

Autauga County, AL, Baldwin County, AL, Bibb County, AL, Blount County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Conecuh County, AL, Coosa County, AL, Crenshaw County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Etowah County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Pickens County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Santa Rosa County, FL, Carroll County, GA, Cobb County, GA, Douglas County, GA, Haralson County, GA, Heard County, GA, Paulding County, GA, Polk County, GA, Saint Tammany Parish, LA, Clarke County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jasper County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 136 km from the middle of the area, began a volume at 20:53 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

Birmingham, AL (KBMX), launched 12:00Z, 8.9 hours before the alert went out and 181 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 2011-12-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 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 2011-12-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 102 square meters per square second.1939587897117Sfc1 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
699 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
102 m²/s²
0-3 km storm-relative helicity
129 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 22, 9:32 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Bibb, Blount, Butler, Calhoun and 31 more58 min
Dec 22, 10:00 AM CSTTornado WatchSPCAutauga, Baldwin, Barbour, Bibb, Blount, Bullock and 50 more7 hr
Dec 22, 11:22 AM CSTMesoscale DiscussionSPCChoctaw, Clarke, Dallas, Marengo, Mobile, Monroe and 2 more53 min
Dec 22, 1:02 PM CSTMesoscale DiscussionSPCBaldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 81 more118 min
Dec 22, 2:20 PM CSTTornado WatchSPCBaldwin, Banks, Barrow, Bartow, Bibb, Butts and 77 more6 hr
Dec 22, 5:25 PM CSTMesoscale DiscussionSPCBaldwin, Banks, Barrow, Bibb, Butts, Chattahoochee and 53 more95 min
Dec 22, 4:11 AM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 32 more34 min
Dec 22, 4:36 AM CSTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 32 more7 hr
Dec 22, 7:50 AM CSTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more55 min

Nearby

Mesoscale Discussions in Alabama, 2011Mesoscale Discussions in Mississippi, 2011Mesoscale Discussions in Georgia, 2011Every mesoscale discussion in 2011

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.