Alert archive / Georgia / Mesoscale Discussions in 2009

Mesoscale Discussion 438

April 10, 200915 counties in Alabama; 66 counties in Georgia; 15 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2009, 6:34 PM CDT for 15 counties in Alabama; 66 counties in Georgia; 15 counties in South Carolina. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued
Apr 10, 2009, 6:34 PM CDT (23:34 UTC)
Expired
Apr 10, 2009, 7:30 PM CDT
In force
56 min
Issued by
the Storm Prediction Center
All 96 counties

Autauga County, AL, Calhoun County, AL, Chambers County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Elmore County, AL, Lee County, AL, Macon County, AL, Perry County, AL, Randolph County, AL, Russell County, AL, Talladega County, AL, Tallapoosa County, AL, Baldwin County, GA, Banks County, GA, Barrow County, GA, Bartow County, GA, Bibb County, GA, Butts County, GA, Carroll County, GA, Chattahoochee County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Columbia County, GA, Coweta County, GA, Crawford County, GA, DeKalb County, GA, Douglas County, GA, Elbert County, GA, Fayette County, GA, Forsyth County, GA, Franklin County, GA, Fulton County, GA, Glascock County, GA, Greene County, GA, Gwinnett County, GA, Hall County, GA, Hancock County, GA, Haralson County, GA, Harris County, GA, Hart County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Jasper County, GA, Jones County, GA, Lamar County, GA, Lincoln County, GA, Madison County, GA, Marion County, GA, McDuffie County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Peach County, GA, Pike County, GA, Polk County, GA, Putnam County, GA, Rockdale County, GA, Spalding County, GA, Stephens County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Troup County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Wilkes County, GA, Wilkinson County, GA, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Chester County, SC, Edgefield County, SC, Greenville County, SC, Greenwood County, SC, Laurens County, SC, McCormick County, SC, Newberry County, SC, Pickens County, SC, Saluda County, SC, Spartanburg County, SC, Union County, SC, York County, SC

The radar

The Atlanta radar (KFFC), 44 km from the middle of the area, began a volume at 23:38 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 11.6 hours before the alert went out and 39 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 12:00Z on 2009-04-10Temperature 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 12:00Z on 2009-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 256 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
671 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
256 m²/s²
0-3 km storm-relative helicity
292 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
Apr 10, 1:24 AM CDTMesoscale DiscussionSPCColbert, Fayette, Franklin, Lamar, Lauderdale, Marion and 1 more96 min
Apr 10, 1:43 AM CDTTornado WatchSPCBlount, Colbert, Cullman, Fayette, Franklin, Greene and 12 more5 hr
Apr 10, 4:25 AM CDTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Cleburne, Cullman, DeKalb and 13 more95 min
Apr 10, 8:22 AM CDTMesoscale DiscussionSPCLauderdale83 min
Apr 10, 11:14 AM CDTMesoscale DiscussionSPCColbert, Franklin, Jackson, Lauderdale, Lawrence, Limestone and 4 more76 min
Apr 10, 11:23 AM CDTTornado Watch PDSSPCBibb, Blount, Calhoun, Cherokee, Cleburne, Colbert and 25 more8 hr
Apr 10, 12:58 PM CDTMesoscale DiscussionSPCColbert, Cullman, Fayette, Franklin, Jackson, Lamar and 8 more92 min
Apr 10, 2:29 PM CDTMesoscale DiscussionSPCCleburne91 min
Apr 10, 2:39 PM CDTTornado Watch PDSSPCAutauga, Barbour, Bullock, Calhoun, Chambers, Cherokee and 19 more8 hr
Apr 10, 3:43 PM CDTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Cleburne, DeKalb, Etowah and 4 more92 min
Apr 10, 7:04 AM CDTMesoscale DiscussionSPCBanks, Bartow, Chattooga, Cherokee, Cobb, Dawson and 23 more86 min
Apr 10, 5:11 PM CDTMesoscale DiscussionSPCBaldwin, Bibb, Butts, Clarke, Columbia, Crawford and 32 more64 min
Apr 10, 5:31 PM CDTTornado WatchSPCBaldwin, Bibb, Bleckley, Butts, Chattahoochee, Columbia and 53 more7 hr

Nearby

Mesoscale Discussions in Georgia, 2009Mesoscale Discussions in Alabama, 2009Mesoscale Discussions in South Carolina, 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; radar from the NEXRAD Level II archive.