Alert archive / Georgia / Mesoscale Discussions in 2012

Mesoscale Discussion 597

April 26, 20124 states

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2012, 7:09 PM EDT for 4 states. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Apr 26, 2012, 7:09 PM EDT (23:09 UTC)
Expired
Apr 26, 2012, 8:45 PM EDT
In force
96 min
Issued by
the Storm Prediction Center
All 59 counties

Banks County, GA, Barrow County, GA, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Clarke County, GA, Cobb County, GA, Dawson County, GA, Elbert County, GA, Fannin County, GA, Forsyth County, GA, Franklin County, GA, Gilmer County, GA, Gordon County, GA, Gwinnett County, GA, Habersham County, GA, Hall County, GA, Hart County, GA, Jackson County, GA, Lincoln County, GA, Lumpkin County, GA, Madison County, GA, Murray County, GA, Oglethorpe County, GA, Pickens County, GA, Rabun County, GA, Stephens County, GA, Towns County, GA, Union County, GA, Walker County, GA, White County, GA, Whitfield County, GA, Cherokee County, NC, Clay County, NC, Macon County, NC, Transylvania County, NC, Abbeville County, SC, Anderson County, SC, Calhoun County, SC, Edgefield County, SC, Fairfield County, SC, Greenville County, SC, Greenwood County, SC, Kershaw County, SC, Laurens County, SC, Lee County, SC, Lexington County, SC, McCormick County, SC, Newberry County, SC, Oconee County, SC, Pickens County, SC, Richland County, SC, Saluda County, SC, Spartanburg County, SC, Sumter County, SC, Union County, SC, Bradley County, TN, Polk County, TN

The radar

The Greer radar (KGSP), 110 km from the middle of the area, began a volume at 23:10 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

Charleston AFB, SC (KCHS), launched 12:00Z, 11.2 hours before the alert went out and 348 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, Charleston AFB, SC at 12:00Z on 2012-04-26Temperature 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, Charleston AFB, SC at 12:00Z on 2012-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 110 square meters per square second.193958Sfc1 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
1861 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
110 m²/s²
0-3 km storm-relative helicity
104 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 26, 8:10 AM EDTSevere Thunderstorm WatchSPCCatoosa, Dade, Fannin, Gilmer, Habersham, Lumpkin and 8 more3 hr
Apr 26, 8:47 AM EDTMesoscale DiscussionSPCBanks, Dawson, Elbert, Fannin, Franklin, Gilmer and 13 more88 min
Apr 26, 7:24 AM EDTMesoscale DiscussionSPCAlexander, Alleghany, Ashe, Avery, Buncombe, Burke and 20 more96 min
Apr 26, 4:22 PM EDTMesoscale DiscussionSPCBuncombe, Graham, Haywood, Henderson, Jackson, Polk and 2 more83 min
Apr 26, 5:07 AM EDTMesoscale DiscussionSPCAnderson, Campbell, Claiborne, Clay, Cumberland, Davidson and 15 more83 min
Apr 26, 6:22 AM EDTSevere Thunderstorm WatchSPCAnderson, Bedford, Bledsoe, Blount, Campbell, Cannon and 44 more3 hr
Apr 26, 2:23 PM EDTMesoscale DiscussionSPCCheatham, Clay, Davidson, DeKalb, Dickson, Fentress and 17 more2 hr
Apr 26, 3:11 PM EDTSevere Thunderstorm WatchSPCBedford, Campbell, Cannon, Cheatham, Claiborne, Clay and 30 more6 hr
Apr 26, 5:52 PM EDTMesoscale DiscussionSPCBenton, Carroll, Chester, Crockett, Decatur, Dickson and 13 more83 min
Apr 26, 6:40 PM EDTMesoscale DiscussionSPCAnderson, Bedford, Bledsoe, Blount, Campbell, Cannon and 58 more95 min

Nearby

Mesoscale Discussions in Georgia, 2012Mesoscale Discussions in South Carolina, 2012Mesoscale Discussions in North Carolina, 2012Every mesoscale discussion in 2012

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.