Alert archive / Georgia / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 23
The Storm Prediction Center issued this severe thunderstorm watch at Feb 13, 2007, 3:34 PM EST for 11 counties in Florida; 35 counties in Georgia. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 13, 2007, 3:34 PM EST (20:34 UTC)
- Expired
- Feb 13, 2007, 9:00 PM EST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 46 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Gilchrist County, FL, Hamilton County, FL, Nassau County, FL, Suwannee County, FL, Union County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Brantley County, GA, Bryan County, GA, Bulloch County, GA, Camden County, GA, Candler County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Coffee County, GA, Dodge County, GA, Echols County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glynn County, GA, Jeff Davis County, GA, Jenkins County, GA, Johnson County, GA, Laurens County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Montgomery County, GA, Pierce County, GA, Screven County, GA, Tattnall County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Ware County, GA, Wayne County, GA, Wheeler County, GA
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 5%
- 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
- 70%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 13, 3:34 PM EST | Severe Thunderstorm Warning | FFC | Telfair | 41 min |
| Feb 13, 4:12 PM EST | Severe Thunderstorm Warning | JAX | Atkinson, Clinch | 48 min |
| Feb 13, 5:06 PM EST | Severe Thunderstorm Warning | CHS | Candler, Tattnall | 39 min |
| Feb 13, 6:13 PM EST | Severe Thunderstorm Warning | CHS | Effingham, Screven | 47 min |
| Feb 13, 6:30 PM EST | Severe Thunderstorm Warning | CHS | Bryan | 30 min |
| Feb 13, 6:34 PM EST | Tornado Warning | CHS | Screven | 25 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, 8.6 hours before the alert went out and 128 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
- 46 J/kg
- Mixed-layer CIN
- -81 J/kg
- Mixed-layer LCL
- 507 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 89 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 |
|---|---|---|---|---|
| Feb 13, 3:43 AM EST | Tornado Watch | SPC | Escambia, Okaloosa, Santa Rosa | 10 hr |
| Feb 13, 8:24 AM EST | Mesoscale Discussion | SPC | Escambia, Santa Rosa | 96 min |
| Feb 13, 9:52 AM EST | Mesoscale Discussion | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 8 more | 53 min |
| Feb 13, 10:07 AM EST | Tornado Watch | SPC | Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 11 more | 7 hr |
| Feb 13, 11:17 AM EST | Mesoscale Discussion | SPC | Charlotte, DeSoto, Hardee, Hernando, Hillsborough, Lee and 5 more | 88 min |
| Feb 13, 12:54 PM EST | Severe Thunderstorm Watch | SPC | Brevard, Charlotte, Citrus, DeSoto, Flagler, Glades and 25 more | 5 hr |
| Feb 13, 1:08 PM EST | Mesoscale Discussion | SPC | Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 11 more | 67 min |
| Feb 13, 3:15 PM EST | Mesoscale Discussion | SPC | Brevard, Flagler, Glades, Hardee, Highlands, Indian River and 8 more | 60 min |
| Feb 13, 2:14 PM EST | Mesoscale Discussion | SPC | Atkinson, Bacon, Baldwin, Ben Hill, Berrien, Bibb and 24 more | 91 min |
| Feb 13, 4:54 PM EST | Tornado Watch | SPC | Burke, Columbia, Lincoln, McDuffie, Richmond | 7 hr |
Nearby
Severe Thunderstorm Watches in Georgia, 2007Severe Thunderstorm Watches in Florida, 2007Every severe thunderstorm watch in 2007
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.