Alert archive / Georgia / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 375
The Storm Prediction Center issued this severe thunderstorm watch at Jun 30, 2015, 1:57 PM EDT for 8 counties in Florida; 12 counties in Georgia. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 30, 2015, 1:57 PM EDT (17:57 UTC)
- Expired
- Jun 30, 2015, 9:00 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Alachua County, FL, Baker County, FL, Bradford County, FL, Columbia County, FL, Gilchrist County, FL, Hamilton County, FL, Suwannee County, FL, Union County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Brantley County, GA, Charlton County, GA, Clinch County, GA, Coffee County, GA, Echols County, GA, Jeff Davis County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA
The radar
The Moody AFB radar (KVAX), 45 km from the middle of the area, began a volume at 17:58 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
- 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
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 1:59 PM EDT | Severe Thunderstorm Warning | JAX | Columbia, Hamilton, Suwannee | 46 min |
| Jun 30, 2:13 PM EDT | Severe Thunderstorm Warning | JAX | Camden, Charlton, Clinch, Ware | 32 min |
| Jun 30, 2:29 PM EDT | Severe Thunderstorm Warning | JAX | Baker, Columbia, Suwannee | 46 min |
| Jun 30, 3:26 PM EDT | Severe Thunderstorm Warning | JAX | Appling, Jeff Davis | 23 min |
| Jun 30, 7:22 PM EDT | Severe Thunderstorm Warning | JAX | Hamilton, Suwannee | 38 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
Jacksonville, FL (KJAX), launched 12:00Z, 6.0 hours before the alert went out and 92 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.
- Mixed-layer CAPE
- 848 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 913 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- -26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 12:17 PM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Columbia, Gadsden, Hamilton, Holmes and 10 more | 88 min |
| Jun 30, 12:38 PM EDT | Mesoscale Discussion | SPC | Escambia, Okaloosa, Santa Rosa | 97 min |
| Jun 30, 2:06 PM EDT | Severe Thunderstorm Watch | SPC | Bay, Calhoun, Dixie, Escambia, Franklin, Gadsden and 14 more | 6 hr |
| Jun 30, 4:51 PM EDT | Mesoscale Discussion | SPC | Alachua, Bradford, Calhoun, Clay, Columbia, Gadsden and 11 more | 114 min |
| Jun 30, 8:59 AM EDT | Mesoscale Discussion | SPC | Barrow, Bartow, Bibb, Butts, Carroll, Chattahoochee and 41 more | 2 hr |
| Jun 30, 12:55 PM EDT | Mesoscale Discussion | SPC | Fannin, Rabun, Towns, Union | 3 hr |
| Jun 30, 1:01 PM EDT | Mesoscale Discussion | SPC | Baldwin, Banks, Barrow, Bibb, Bleckley, Bulloch and 66 more | 89 min |
| Jun 30, 1:37 PM EDT | Severe Thunderstorm Watch | SPC | Elbert, Franklin, Habersham, Hart, Rabun, Stephens | 7 hr |
| Jun 30, 1:53 PM EDT | Severe Thunderstorm Watch | SPC | Baldwin, Banks, Barrow, Bibb, Bleckley, Bryan and 64 more | 6 hr |
| Jun 30, 4:33 PM EDT | Mesoscale Discussion | SPC | Baldwin, Banks, Barrow, Bibb, Bleckley, Bulloch and 53 more | 117 min |
| Jun 30, 7:08 PM EDT | Mesoscale Discussion | SPC | Catoosa, Fannin, Franklin, Gilmer, Habersham, Hart and 7 more | 67 min |
Nearby
Severe Thunderstorm Watches in Georgia, 2015Severe Thunderstorm Watches in Florida, 2015Every 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.