Alert archive / Alabama / Mesoscale Discussions in 2011

Mesoscale Discussion 2330

November 16, 201121 counties in Alabama; 13 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Nov 16, 2011, 7:25 AM CST for 21 counties in Alabama; 13 counties in Georgia. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Nov 16, 2011, 7:25 AM CST (13:25 UTC)
Expired
Nov 16, 2011, 9:00 AM CST
In force
95 min
Issued by
the Storm Prediction Center
All 34 counties

Autauga County, AL, Barbour County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Clay County, AL, Cleburne County, AL, Conecuh County, AL, Coosa County, AL, Crenshaw County, AL, Elmore County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Montgomery County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Talladega County, AL, Tallapoosa County, AL, Carroll County, GA, Clayton County, GA, Coweta County, GA, Douglas County, GA, Fayette County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Meriwether County, GA, Muscogee County, GA, Pike County, GA, Spalding County, GA, Troup 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, 1.4 hours before the alert went out and 114 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, 9:46 AM CSTTornado WatchSPCAutauga, Baldwin, Barbour, Bibb, Blount, Bullock and 49 more7 hr
Nov 16, 9:59 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bullock, Butler, Calhoun and 31 more91 min
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, 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, 4:35 PM CSTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Berrien, Brantley, Brooks and 16 more85 min
Nov 16, 5:48 PM CSTMesoscale DiscussionSPCChatham, Effingham, Screven87 min

Nearby

Mesoscale Discussions in Alabama, 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.