Alert archive / Georgia / Severe Thunderstorm Watches in 2015

Severe Thunderstorm Watch 475

August 6, 201571 counties in Georgia; 28 counties in South Carolina

The Storm Prediction Center issued this severe thunderstorm watch at Aug 6, 2015, 3:20 PM EDT for 71 counties in Georgia; 28 counties in South Carolina. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Aug 6, 2015, 3:20 PM EDT (19:20 UTC)
Expired: Aug 6, 2015, 10:00 PM EDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1 in
Strongest gust expected: 60 kt

All 99 counties

Baldwin County, GA, Banks County, GA, Barrow County, GA, Bibb County, GA, Bleckley County, GA, Burke County, GA, Butts County, GA, Chattahoochee County, GA, Clarke County, GA, Columbia County, GA, Crawford County, GA, Crisp County, GA, Dodge County, GA, Dooly County, GA, Elbert County, GA, Emanuel County, GA, Franklin County, GA, Glascock County, GA, Greene County, GA, Habersham County, GA, Hancock County, GA, Hart County, GA, Henry County, GA, Houston County, GA, Jackson County, GA, Jasper County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Laurens County, GA, Lincoln County, GA, Macon County, GA, Madison County, GA, Marion County, GA, McDuffie County, GA, Monroe County, GA, Montgomery County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Peach County, GA, Pike County, GA, Pulaski County, GA, Putnam County, GA, Rabun County, GA, Richmond County, GA, Rockdale County, GA, Schley County, GA, Spalding County, GA, Stephens County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Wilkes County, GA, Wilkinson County, GA, Abbeville County, SC, Aiken County, SC, Anderson County, SC, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Cherokee County, SC, Chester County, SC, Clarendon 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, Orangeburg County, SC, Pickens County, SC, Richland County, SC, Saluda County, SC, Spartanburg County, SC, Sumter County, SC, Union County, SC, York County, SC

The radar

The Robins AFB radar (KJGX), 123 km from the middle of the area, began a volume at 19:22 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 10%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 20%
One or more hailstones of 2 inches or more: 5%
Six or more combined severe hail and wind reports: 60%

Warnings issued inside it

37 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Aug 6, 3:23 PM EDT	Severe Thunderstorm Warning	GSP	Greenville, Laurens, Spartanburg	66 min
Aug 6, 3:38 PM EDT	Severe Thunderstorm Warning	FFC	Banks, Clarke, Jackson, Madison, Oconee, Oglethorpe	52 min
Aug 6, 3:48 PM EDT	Severe Thunderstorm Warning	FFC	Baldwin, Greene, Hancock, Jasper, Jones, Morgan and 4 more	42 min
Aug 6, 3:55 PM EDT	Severe Thunderstorm Warning	CAE	Lexington, Newberry, Richland, Saluda	35 min
Aug 6, 3:59 PM EDT	Severe Thunderstorm Warning	GSP	Elbert, Franklin, Hart	49 min
Aug 6, 4:01 PM EDT	Severe Thunderstorm Warning	GSP	Cherokee, Spartanburg, Union, York	74 min
Aug 6, 4:06 PM EDT	Severe Thunderstorm Warning	CAE	Lincoln	54 min
Aug 6, 4:10 PM EDT	Severe Thunderstorm Warning	FFC	Harris, Talbot	35 min
Aug 6, 4:16 PM EDT	Severe Thunderstorm Warning	FFC	Baldwin, Greene, Hancock, Putnam, Taliaferro, Warren	29 min
Aug 6, 4:20 PM EDT	Severe Thunderstorm Warning	GSP	Laurens	55 min
Aug 6, 4:26 PM EDT	Severe Thunderstorm Warning	FFC	Twiggs	34 min
Aug 6, 4:28 PM EDT	Severe Thunderstorm Warning	FFC	Bibb, Jones, Monroe, Twiggs	32 min
Aug 6, 4:29 PM EDT	Severe Thunderstorm Warning	GSP	Anderson	47 min
Aug 6, 4:32 PM EDT	Severe Thunderstorm Warning	CAE	Chesterfield, Fairfield, Kershaw, Lee, Lexington, Richland and 1 more	58 min
Aug 6, 4:34 PM EDT	Severe Thunderstorm Warning	GSP	Cherokee, Chester, Union, York	71 min
Aug 6, 4:38 PM EDT	Severe Thunderstorm Warning	CAE	McDuffie	37 min
Aug 6, 4:49 PM EDT	Severe Thunderstorm Warning	FFC	Baldwin, Jones, Twiggs, Wilkinson	41 min
Aug 6, 4:50 PM EDT	Severe Thunderstorm Warning	CAE	Burke, Columbia, Lincoln, McDuffie, Richmond	55 min
Aug 6, 4:51 PM EDT	Severe Thunderstorm Warning	GSP	Oconee	23 min
Aug 6, 4:52 PM EDT	Severe Thunderstorm Warning	FFC	Johnson, Laurens	23 min
Aug 6, 5:12 PM EDT	Severe Thunderstorm Warning	CAE	Edgefield, Fairfield, Lexington, McCormick, Newberry, Richland and 1 more	48 min
Aug 6, 5:13 PM EDT	Severe Thunderstorm Warning	FFC	Hancock, Washington	47 min
Aug 6, 5:27 PM EDT	Severe Thunderstorm Warning	FFC	Emanuel, Johnson	48 min
Aug 6, 5:32 PM EDT	Severe Thunderstorm Warning	FFC	Jefferson, Johnson, Washington	43 min
Aug 6, 5:32 PM EDT	Flash Flood Warning	CAE	Lexington, Richland	118 min
Aug 6, 5:46 PM EDT	Severe Thunderstorm Warning	CAE	Calhoun, Lexington, Richland, Sumter	44 min
Aug 6, 5:48 PM EDT	Severe Thunderstorm Warning	CAE	Burke, Richmond	57 min
Aug 6, 6:01 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Kershaw, Lancaster	44 min
Aug 6, 6:35 PM EDT	Severe Thunderstorm Warning	CAE	Calhoun, Richland	40 min
Aug 6, 6:42 PM EDT	Severe Thunderstorm Warning	CAE	Calhoun, Lexington, Orangeburg	33 min
Aug 6, 6:43 PM EDT	Severe Thunderstorm Warning	CAE	Calhoun, Lexington, Orangeburg	47 min
Aug 6, 7:03 PM EDT	Severe Thunderstorm Warning	CAE	Kershaw, Lee	42 min
Aug 6, 7:16 PM EDT	Severe Thunderstorm Warning	FFC	Marion, Schley	30 min
Aug 6, 7:29 PM EDT	Flash Flood Warning	CAE	Lexington, Richland	2 hr
Aug 6, 8:07 PM EDT	Severe Thunderstorm Warning	FFC	Chattahoochee, Harris, Muscogee	38 min
Aug 6, 8:28 PM EDT	Flash Flood Warning	FFC	Muscogee	3 hr
Aug 6, 8:50 PM EDT	Severe Thunderstorm Warning	FFC	Chattahoochee, Stewart	40 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 7.3 hours before the alert went out and 153 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 305 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 761 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 39 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 6, 2:40 PM EDT	Mesoscale Discussion	SPC	Baldwin, Banks, Barrow, Bibb, Bleckley, Butts and 59 more	2 hr
Aug 6, 6:08 PM EDT	Mesoscale Discussion	SPC	Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more	67 min

Nearby

Severe Thunderstorm Watches in Georgia, 2015 Severe Thunderstorm Watches in South Carolina, 2015 Every severe thunderstorm watch 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.