Alert archive / Georgia / Mesoscale Discussions in 2011

Mesoscale Discussion 176

February 28, 20115 states

The Storm Prediction Center issued this mesoscale discussion at Feb 28, 2011, 3:36 PM CST for 5 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Feb 28, 2011, 3:36 PM CST (21:36 UTC)
Expired
Feb 28, 2011, 5:00 PM CST
In force
84 min
Issued by
the Storm Prediction Center
Concerning
Tornado watch 33
All 128 counties

Autauga County, AL, Bibb County, AL, Bullock County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Etowah County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Montgomery County, AL, Perry County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Wilcox County, AL, Banks County, GA, Barrow County, GA, Bartow County, GA, Butts County, GA, Carroll County, GA, Chattahoochee County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Elbert County, GA, Fannin County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Franklin County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Gwinnett County, GA, Habersham County, GA, Hall County, GA, Haralson County, GA, Harris County, GA, Hart County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Lamar County, GA, Lumpkin County, GA, Madison County, GA, Marion County, GA, Meriwether County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Pickens County, GA, Pike County, GA, Polk County, GA, Rabun County, GA, Rockdale County, GA, Spalding County, GA, Stephens County, GA, Talbot County, GA, Towns County, GA, Troup County, GA, Union County, GA, Upson County, GA, Walton County, GA, White County, GA, Alexander County, NC, Buncombe County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Caswell County, NC, Catawba County, NC, Clay County, NC, Cleveland County, NC, Davidson County, NC, Davie County, NC, Forsyth County, NC, Gaston County, NC, Guilford County, NC, Henderson County, NC, Iredell County, NC, Jackson County, NC, Lincoln County, NC, Macon County, NC, McDowell County, NC, Mecklenburg County, NC, Polk County, NC, Rockingham County, NC, Rowan County, NC, Rutherford County, NC, Stokes County, NC, Surry County, NC, Transylvania County, NC, Wilkes County, NC, Yadkin County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Greenville County, SC, Laurens County, SC, Oconee County, SC, Pickens County, SC, Spartanburg County, SC, Union County, SC, York County, SC, City of Danville, VA

The radar

The Atlanta radar (KFFC), 89 km from the middle of the area, began a volume at 21:40 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 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 12:00Z, 9.6 hours before the alert went out and 85 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 2011-02-28Temperature 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 2011-02-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 229 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1162 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
229 m²/s²
0-3 km storm-relative helicity
350 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
Feb 28, 5:47 AM CSTMesoscale DiscussionSPCColbert, Franklin, Jackson, Lamar, Lauderdale, Lawrence and 5 more28 min
Feb 28, 5:59 AM CSTTornado WatchSPCColbert, Cullman, DeKalb, Fayette, Franklin, Jackson and 10 more7 hr
Feb 28, 11:25 AM CSTMesoscale DiscussionSPCBlount, Colbert, Cullman, DeKalb, Fayette, Franklin and 11 more95 min
Feb 28, 12:19 PM CSTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bullock, Butler, Clarke and 15 more86 min
Feb 28, 12:29 PM CSTTornado WatchSPCAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 41 more7 hr
Feb 28, 5:16 PM CSTMesoscale DiscussionSPCBaldwin, Barbour, Butler, Clarke, Coffee, Conecuh and 12 more89 min
Feb 28, 4:04 PM CSTSevere Thunderstorm WatchSPCBaldwin, Bibb, Burke, Butts, Chattahoochee, Columbia and 33 more5 hr
Feb 28, 5:42 PM CSTMesoscale DiscussionSPCBaldwin, Bibb, Butts, Columbia, Crawford, Glascock and 21 more93 min
Feb 28, 4:47 AM CSTTornado WatchSPCBuchanan, Dickenson, Lee, Russell, Scott, Washington and 3 more5 hr
Feb 28, 7:36 AM CSTMesoscale DiscussionSPCAlbemarle, Alleghany, Amherst, Appomattox, Arlington, Augusta and 64 more24 min
Feb 28, 7:57 AM CSTTornado WatchSPCAlbemarle, Alleghany, Amherst, Appomattox, Arlington, Augusta and 67 more9 hr
Feb 28, 11:49 AM CSTMesoscale DiscussionSPCAppomattox, Bedford, Buckingham, Campbell, Caroline, Carroll and 20 more56 min

Nearby

Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in Alabama, 2011Mesoscale Discussions in North Carolina, 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.