Alert archive / Georgia / Mesoscale Discussions in 2009

Mesoscale Discussion 2227

December 9, 200922 counties in Alabama; Holmes County, Florida; 62 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Dec 9, 2009, 2:20 AM CST for 22 counties in Alabama; Holmes County, Florida; 62 counties in Georgia. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Dec 9, 2009, 2:20 AM CST (08:20 UTC)
Expired
Dec 9, 2009, 3:45 AM CST
In force
85 min
Issued by
the Storm Prediction Center
All 85 counties

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, Montgomery County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Tallapoosa County, AL, Holmes County, FL, Baldwin County, GA, Bartow County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Calhoun County, GA, Carroll County, GA, Chattahoochee County, GA, Cherokee County, GA, Clay County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Crawford County, GA, Crisp County, GA, DeKalb County, GA, Dooly County, GA, Douglas County, GA, Early County, GA, Fayette County, GA, Forsyth County, GA, Fulton County, GA, Gwinnett County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Jasper County, GA, Jones County, GA, Lamar County, GA, Lee County, GA, Macon County, GA, Marion County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Paulding County, GA, Peach County, GA, Pickens County, GA, Pike County, GA, Polk County, GA, Pulaski County, GA, Putnam County, GA, Quitman County, GA, Randolph County, GA, Rockdale County, GA, Schley County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Terrell County, GA, Troup County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Webster County, GA, Wilkinson 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 8.3 hours before the alert went out and 132 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, Peachtre/Fal Fld, GA at 00:00Z on 2009-12-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Peachtre/Fal Fld, GA at 00:00Z on 2009-12-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
449 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 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 8, 6:12 PM CSTTornado WatchSPCBibb, Blount, Choctaw, Clarke, Dallas, Fayette and 15 more8 hr
Dec 8, 9:47 PM CSTMesoscale DiscussionSPCBibb, Blount, Choctaw, Clarke, Colbert, Cullman and 18 more88 min
Dec 8, 10:24 PM CSTMesoscale DiscussionSPCCalhoun, Chambers, Cherokee, Clay, Cleburne, Coosa and 10 more96 min
Dec 8, 11:09 PM CSTTornado WatchSPCAutauga, Bullock, Calhoun, Chambers, Cherokee, Chilton and 17 more5 hr
Dec 9, 3:32 AM CSTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston5 hr
Dec 9, 10:29 AM CSTMesoscale DiscussionSPCBaker, Columbia, Dixie, Franklin, Gilchrist, Gulf and 11 more91 min
Dec 9, 5:11 AM CSTTornado WatchSPCBurke, Columbia, Richmond4 hr
Dec 9, 7:15 AM CSTMesoscale DiscussionSPCBaker, Ben Hill, Candler, Coffee, Colquitt, Decatur and 13 more60 min

Nearby

Mesoscale Discussions in Georgia, 2009Mesoscale Discussions in Alabama, 2009Mesoscale Discussions in Florida, 2009Every mesoscale discussion in 2009

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.