Alert archive / Georgia / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 481

June 15, 201161 counties in Georgia; 24 counties in South Carolina

The Storm Prediction Center issued this severe thunderstorm watch at Jun 15, 2011, 7:35 PM EDT for 61 counties in Georgia; 24 counties in South Carolina. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jun 15, 2011, 7:35 PM EDT (23:35 UTC)
Expired: Jun 16, 2011, 1:00 AM EDT
In force: 5 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 85 counties

Baldwin County, GA, Bibb County, GA, Bleckley County, GA, Burke County, GA, Butts County, GA, Chattahoochee County, GA, Clarke County, GA, Clayton County, GA, Columbia County, GA, Crawford County, GA, Crisp County, GA, Dodge County, GA, Dooly County, GA, Elbert County, GA, Emanuel County, GA, Glascock County, GA, Greene County, GA, Hancock County, GA, Harris County, GA, Henry County, GA, Houston County, GA, Jasper County, GA, Jefferson County, GA, Johnson County, GA, Jones 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, Pulaski County, GA, Putnam County, GA, Richmond County, GA, Rockdale County, GA, Schley 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, 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, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Chester County, SC, Chesterfield County, SC, Clarendon County, SC, Edgefield County, SC, Fairfield County, SC, Greenwood County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lee County, SC, Lexington County, SC, McCormick County, SC, Newberry County, SC, Orangeburg County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC, Union County, SC, York County, SC

The radar

The Columbia radar (KCAE), 56 km from the middle of the area, began a volume at 23:35 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: 5%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 50%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 15, 7:35 PM EDT	Severe Thunderstorm Warning	GSP	Chester	55 min
Jun 15, 7:37 PM EDT	Severe Thunderstorm Warning	FFC	Gwinnett, Walton	53 min
Jun 15, 7:48 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Newberry	27 min
Jun 15, 7:53 PM EDT	Severe Thunderstorm Warning	FFC	Henry, Newton, Rockdale	67 min
Jun 15, 8:00 PM EDT	Severe Thunderstorm Warning	CAE	Columbia, Lincoln	45 min
Jun 15, 8:03 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Kershaw, Lancaster, Lexington, Newberry, Richland and 1 more	42 min
Jun 15, 8:14 PM EDT	Severe Thunderstorm Warning	GSP	Elbert	46 min
Jun 15, 8:36 PM EDT	Severe Thunderstorm Warning	CAE	Columbia, Lincoln, McDuffie, Richmond	39 min
Jun 15, 8:37 PM EDT	Severe Thunderstorm Warning	FFC	Jasper, Morgan, Walton	53 min
Jun 15, 8:46 PM EDT	Severe Thunderstorm Warning	CAE	Calhoun, Chesterfield, Fairfield, Kershaw, Lancaster, Lee and 4 more	44 min
Jun 15, 8:49 PM EDT	Severe Thunderstorm Warning	CAE	Lincoln	26 min
Jun 15, 9:17 PM EDT	Severe Thunderstorm Warning	CAE	Burke, Richmond	43 min
Jun 15, 9:28 PM EDT	Severe Thunderstorm Warning	CAE	Calhoun, Clarendon, Lee, Orangeburg, Richland, Sumter	62 min
Jun 15, 9:48 PM EDT	Severe Thunderstorm Warning	CAE	Bamberg, Barnwell, Orangeburg	42 min
Jun 15, 10:03 PM EDT	Severe Thunderstorm Warning	FFC	Johnson, Laurens	42 min
Jun 15, 10:07 PM EDT	Severe Thunderstorm Warning	FFC	Jasper, Newton	53 min
Jun 15, 10:09 PM EDT	Severe Thunderstorm Warning	FFC	Telfair, Wheeler	51 min
Jun 15, 10:27 PM EDT	Severe Thunderstorm Warning	CAE	Bamberg, Calhoun, Clarendon, Orangeburg	48 min
Jun 15, 10:33 PM EDT	Severe Thunderstorm Warning	FFC	Emanuel, Montgomery, Toombs, Treutlen	57 min
Jun 15, 10:42 PM EDT	Severe Thunderstorm Warning	FFC	Laurens	33 min
Jun 15, 10:47 PM EDT	Severe Thunderstorm Warning	FFC	Dodge, Laurens, Telfair, Wheeler	43 min
Jun 15, 11:04 PM EDT	Severe Thunderstorm Warning	FFC	Crawford, Dooly, Harris, Peach, Talbot, Taylor	26 min
Jun 15, 11:28 PM EDT	Severe Thunderstorm Warning	FFC	Bleckley, Dodge, Pulaski	47 min
Jun 15, 11:35 PM EDT	Severe Thunderstorm Warning	FFC	Emanuel, Montgomery, Toombs, Wheeler	40 min
Jun 15, 11:46 PM EDT	Severe Thunderstorm Warning	FFC	Laurens, Treutlen	44 min
Jun 15, 11:49 PM EDT	Severe Thunderstorm Warning	FFC	Dooly, Houston, Pulaski	15 min
Jun 15, 11:52 PM EDT	Severe Thunderstorm Warning	FFC	Macon, Schley	38 min
Jun 15, 11:56 PM EDT	Severe Thunderstorm Warning	FFC	Chattahoochee, Marion, Stewart, Webster	20 min
Jun 16, 12:11 AM EDT	Severe Thunderstorm Warning	FFC	Dodge, Laurens, Telfair, Wheeler	50 min
Jun 16, 12:35 AM EDT	Severe Thunderstorm Warning	FFC	Chattahoochee, Muscogee	22 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, 11.6 hours before the alert went out and 264 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: 227 J/kg
Mixed-layer CIN: -377 J/kg
Mixed-layer LCL: 1521 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 15, 12:52 PM EDT	Severe Thunderstorm Watch	SPC	Banks, Barrow, Bartow, Carroll, Catoosa, Chattooga and 30 more	9 hr
Jun 15, 4:34 PM EDT	Mesoscale Discussion	SPC	Catoosa, Chattooga, Dade, Dawson, Fannin, Gilmer and 12 more	116 min
Jun 15, 6:53 PM EDT	Mesoscale Discussion	SPC	Banks, Barrow, Bartow, Catoosa, Chattooga, Cherokee and 29 more	97 min

Nearby

Severe Thunderstorm Watches in Georgia, 2011 Severe Thunderstorm Watches in South Carolina, 2011 Every severe thunderstorm watch 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.