Alert archive / Georgia / Mesoscale Discussions in 2011

Mesoscale Discussion 2331

November 16, 201137 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida; 41 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Nov 16, 2011, 9:59 AM CST for 37 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida; 41 counties in Georgia. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Nov 16, 2011, 9:59 AM CST (15:59 UTC)
Expired
Nov 16, 2011, 11:30 AM CST
In force
91 min
Issued by
the Storm Prediction Center
All 81 counties

Autauga County, AL, Baldwin County, AL, Barbour County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coffee County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, DeKalb County, AL, Elmore County, AL, Escambia County, AL, Etowah County, AL, Geneva County, AL, Henry County, AL, Jackson County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marshall County, AL, Monroe County, AL, Montgomery County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Bartow County, GA, Carroll County, GA, Catoosa County, GA, Chattahoochee County, GA, Chattooga County, GA, Cherokee County, GA, Clay County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Dade County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Gwinnett County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Marion County, GA, Meriwether County, GA, Murray County, GA, Muscogee County, GA, Paulding County, GA, Pickens County, GA, Pike County, GA, Polk County, GA, Quitman County, GA, Spalding County, GA, Stewart County, GA, Talbot County, GA, Troup County, GA, Upson County, GA, Walker County, GA, Whitfield County, GA

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 4.0 hours before the alert went out and 118 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 2011-11-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 990 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 2011-11-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 133 square meters per square second.19395878Sfc1 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
990 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
497 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
133 m²/s²
0-3 km storm-relative helicity
197 m²/s²
Significant tornado parameter
1.0
Supercell composite
3.6

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
Nov 15, 8:59 PM CSTMesoscale DiscussionSPCMobile, Washington2 hr
Nov 16, 1:35 AM CSTMesoscale DiscussionSPCAutauga, Bibb, Blount, Butler, Calhoun, Chilton and 33 more115 min
Nov 16, 2:20 AM CSTTornado WatchSPCAutauga, Baldwin, Bibb, Blount, Butler, Calhoun and 36 more8 hr
Nov 16, 5:33 AM CSTMesoscale DiscussionSPCChoctaw, Fayette, Greene, Hale, Jefferson, Lamar and 5 more87 min
Nov 16, 7:25 AM CSTMesoscale DiscussionSPCAutauga, Barbour, Bullock, Butler, Calhoun, Chambers and 15 more95 min
Nov 16, 9:46 AM CSTTornado WatchSPCAutauga, Baldwin, Barbour, Bibb, Blount, Bullock and 49 more7 hr
Nov 16, 12:17 PM CSTMesoscale DiscussionSPCBarbour, Dale, Geneva, Henry, Houston, Russell118 min
Nov 16, 12:35 PM CSTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston7 hr
Nov 16, 4:35 PM CSTMesoscale DiscussionSPCBaker, Bradford, Clay, Columbia, Duval, Gadsden and 12 more85 min
Nov 16, 3:06 PM CSTMesoscale DiscussionSPCAppling, Bacon, Bryan, Bulloch, Burke, Candler and 11 more114 min
Nov 16, 3:30 PM CSTTornado WatchSPCBryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more7 hr
Nov 16, 5:48 PM CSTMesoscale DiscussionSPCChatham, Effingham, Screven87 min

Nearby

Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in Alabama, 2011Mesoscale Discussions in Florida, 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.