Alert archive / Georgia / Severe Thunderstorm Watches in 2016

Severe Thunderstorm Watch 268

June 17, 201618 counties in Florida; 40 counties in Georgia

The Storm Prediction Center issued this severe thunderstorm watch at Jun 17, 2016, 5:08 PM EDT for 18 counties in Florida; 40 counties in Georgia. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 17, 2016, 5:08 PM EDT (21:08 UTC)
Expired: Jun 17, 2016, 11:00 PM EDT
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 58 counties

Baker County, FL, Bay County, FL, Calhoun County, FL, Clay County, FL, Duval County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Nassau County, FL, Saint Johns County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Calhoun County, GA, Camden County, GA, Charlton County, GA, Clay County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Echols County, GA, Glynn County, GA, Grady County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Pierce County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Ware County, GA, Wayne County, GA, Worth County, GA

The radar

The Tallahassee radar (KTLH), 61 km from the middle of the area, began a volume at 21:07 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: 40%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 17, 5:43 PM EDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Jackson, Washington	32 min
Jun 17, 6:11 PM EDT	Severe Thunderstorm Warning	TAE	Jackson	49 min
Jun 17, 6:11 PM EDT	Severe Thunderstorm Warning	TAE	Randolph, Terrell	49 min
Jun 17, 6:14 PM EDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Gulf, Jackson, Washington	31 min
Jun 17, 6:26 PM EDT	Severe Thunderstorm Warning	JAX	Appling, Coffee, Jeff Davis	49 min
Jun 17, 6:39 PM EDT	Severe Thunderstorm Warning	TAE	Holmes, Jackson	51 min
Jun 17, 6:43 PM EDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Jackson, Washington	47 min
Jun 17, 7:00 PM EDT	Severe Thunderstorm Warning	TAE	Randolph, Terrell	16 min
Jun 17, 7:13 PM EDT	Severe Thunderstorm Warning	JAX	Appling, Bacon, Coffee, Jeff Davis, Wayne	62 min
Jun 17, 7:18 PM EDT	Severe Thunderstorm Warning	TAE	Ben Hill, Irwin, Turner	42 min
Jun 17, 7:20 PM EDT	Severe Thunderstorm Warning	TAE	Clay, Quitman, Randolph	55 min
Jun 17, 7:51 PM EDT	Severe Thunderstorm Warning	TAE	Holmes, Jackson, Walton, Washington	69 min
Jun 17, 8:12 PM EDT	Severe Thunderstorm Warning	JAX	Appling, Atkinson, Bacon, Coffee, Pierce, Ware	48 min
Jun 17, 8:12 PM EDT	Severe Thunderstorm Warning	TAE	Calhoun, Clay, Early, Quitman, Randolph, Terrell	78 min
Jun 17, 8:31 PM EDT	Severe Thunderstorm Warning	JAX	Atkinson, Brantley, Charlton, Pierce, Ware	44 min
Jun 17, 8:54 PM EDT	Severe Thunderstorm Warning	JAX	Coffee	51 min
Jun 17, 8:56 PM EDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Holmes, Jackson, Liberty, Walton and 1 more	79 min
Jun 17, 8:56 PM EDT	Severe Thunderstorm Warning	TAE	Ben Hill, Berrien, Irwin, Tift, Turner, Worth	64 min
Jun 17, 9:01 PM EDT	Severe Thunderstorm Warning	TAE	Decatur, Miller, Seminole	29 min
Jun 17, 9:45 PM EDT	Severe Thunderstorm Warning	JAX	Atkinson, Coffee	33 min
Jun 17, 9:56 PM EDT	Severe Thunderstorm Warning	TAE	Berrien, Colquitt, Cook, Irwin, Lanier, Lowndes and 2 more	31 min
Jun 17, 10:02 PM EDT	Severe Thunderstorm Warning	TAE	Bay, Gulf	47 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 9.1 hours before the alert went out and 61 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: 2713 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 826 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 17, 12:34 PM EDT	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Blount, Bullock, Butler and 38 more	116 min
Jun 17, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 53 more	8 hr
Jun 17, 4:12 PM EDT	Mesoscale Discussion	SPC	Autauga, Bibb, Chilton, Choctaw, Clarke, Dallas and 10 more	93 min
Jun 17, 7:15 PM EDT	Mesoscale Discussion	SPC	Baldwin, Barbour, Bullock, Butler, Clarke, Coffee and 12 more	60 min
Jun 17, 7:38 PM EDT	Mesoscale Discussion	SPC	Baker, Duval, Hamilton, Nassau, Saint Johns	67 min
Jun 17, 12:59 PM EDT	Mesoscale Discussion	SPC	Appling, Bacon, Baldwin, Barrow, Ben Hill, Bibb and 80 more	2 hr
Jun 17, 1:52 PM EDT	Severe Thunderstorm Watch	SPC	Baldwin, Barrow, Bartow, Bibb, Bleckley, Bryan and 92 more	8 hr
Jun 17, 3:44 PM EDT	Mesoscale Discussion	SPC	Appling, Baldwin, Ben Hill, Bibb, Bleckley, Bryan and 55 more	61 min

Nearby

Severe Thunderstorm Watches in Georgia, 2016 Severe Thunderstorm Watches in Florida, 2016 Every severe thunderstorm watch in 2016

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.