Alert archive / Georgia / Mesoscale Discussions in 2015

Mesoscale Discussion 1418

July 14, 20156 states

The Storm Prediction Center issued this mesoscale discussion at Jul 14, 2015, 3:55 PM CDT for 6 states. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued
Jul 14, 2015, 3:55 PM CDT (20:55 UTC)
Expired
Jul 14, 2015, 5:00 PM CDT
In force
65 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 98 counties

Blount County, AL, Cherokee County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Franklin County, AL, Jackson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Winston County, AL, Banks County, GA, Barrow County, GA, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Clarke County, GA, Cobb County, GA, Dade County, GA, Dawson County, GA, Elbert County, GA, Fannin County, GA, Floyd 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, Lumpkin County, GA, Madison County, GA, Murray County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Rabun County, GA, Stephens County, GA, Towns County, GA, Union County, GA, Walker County, GA, White County, GA, Whitfield County, GA, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, DeSoto County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Monroe County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Yalobusha County, MS, Cherokee County, NC, Clay County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Chester County, SC, Greenville County, SC, Greenwood County, SC, Laurens County, SC, Newberry County, SC, Oconee County, SC, Pickens County, SC, Spartanburg County, SC, Union County, SC, Bradley County, TN, Fayette County, TN, Franklin County, TN, Giles County, TN, Hamilton County, TN, Hardeman County, TN, Hardin County, TN, Lawrence County, TN, Lincoln County, TN, Marion County, TN, McNairy County, TN, Polk County, TN, Shelby County, TN, Wayne County, TN

The radar

The Northeast Alabama radar (KHTX), 23 km from the middle of the area, began a volume at 20:57 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

Nashville Metro, TN (KBNA), launched 12:00Z, 8.9 hours before the alert went out and 164 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, Nashville Metro, TN at 12:00Z on 2015-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1670 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, Nashville Metro, TN at 12:00Z on 2015-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 111 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
1670 J/kg
Mixed-layer CIN
-104 J/kg
Mixed-layer LCL
991 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
111 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.6
Supercell composite
5.8

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
Jul 14, 12:14 PM CDTMesoscale DiscussionSPCJackson91 min
Jul 14, 2:41 PM CDTMesoscale DiscussionSPCColbert, Jackson, Lauderdale, Limestone, Madison94 min
Jul 14, 3:59 PM CDTSevere Thunderstorm WatchSPCBlount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 17 more7 hr
Jul 14, 5:24 PM CDTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 17 more2 hr
Jul 14, 6:36 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Chambers, Chilton, Clay, Cleburne and 11 more114 min
Jul 13, 7:06 PM CDTMesoscale DiscussionSPCAlamance, Alexander, Anson, Burke, Cabarrus, Caswell and 23 more84 min
Jul 13, 9:34 PM CDTMesoscale DiscussionSPCAnson, Chatham, Durham, Franklin, Granville, Harnett and 12 more86 min
Jul 14, 1:46 PM CDTSevere Thunderstorm WatchSPCCherokee, Clay7 hr
Jul 14, 5:10 PM CDTMesoscale DiscussionSPCAlleghany, Ashe, Caswell, Rockingham, Stokes, Surry2 hr
Jul 14, 5:44 PM CDTSevere Thunderstorm WatchSPCCaswell, Rockingham, Stokes, Surry4 hr
Jul 13, 7:38 PM CDTMesoscale DiscussionSPCBledsoe, Clay, Cumberland, Fentress, Grundy, Hamilton and 10 more97 min
Jul 14, 5:35 AM CDTMesoscale DiscussionSPCAnderson, Campbell, Claiborne, Grainger, Hamblen, Hancock and 4 more55 min
Jul 14, 12:13 PM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more7 hr

Nearby

Mesoscale Discussions in Georgia, 2015Mesoscale Discussions in Mississippi, 2015Mesoscale Discussions in Alabama, 2015Every mesoscale discussion in 2015

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.