Alert archive / Georgia / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 547
The Storm Prediction Center issued this severe thunderstorm watch at Jul 20, 2007, 1:47 PM EDT for 52 counties in Georgia. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2007, 1:47 PM EDT (17:47 UTC)
- Expired
- Jul 20, 2007, 7:43 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 52 counties
Appling County, GA, Atkinson County, GA, Bacon County, GA, Baker County, GA, Baldwin County, GA, Ben Hill County, GA, Berrien County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Calhoun County, GA, Clay County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Crawford County, GA, Crisp County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Houston County, GA, Irwin County, GA, Jasper County, GA, Jeff Davis County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Lanier County, GA, Laurens County, GA, Lee County, GA, Miller County, GA, Mitchell County, GA, Monroe County, GA, Montgomery County, GA, Peach County, GA, Pike County, GA, Pulaski County, GA, Quitman County, GA, Randolph County, GA, Spalding County, GA, Telfair County, GA, Terrell County, GA, Tift County, GA, Treutlen County, GA, Turner County, GA, Twiggs County, GA, Washington County, GA, Wheeler County, GA, Wilcox County, GA, Wilkinson County, GA, Worth County, GA
The radar
The Robins AFB radar (KJGX), 58 km from the middle of the area, began a volume at 17:49 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 60%
- 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
- 80%
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 2:06 PM EDT | Severe Thunderstorm Warning | FFC | Pike | 54 min |
| Jul 20, 2:08 PM EDT | Severe Thunderstorm Warning | FFC | Pike | 52 min |
| Jul 20, 2:27 PM EDT | Severe Thunderstorm Warning | FFC | Lamar, Upson | 48 min |
| Jul 20, 2:58 PM EDT | Severe Thunderstorm Warning | FFC | Monroe | 47 min |
| Jul 20, 3:00 PM EDT | Severe Thunderstorm Warning | FFC | Crawford, Talbot, Taylor | 60 min |
| Jul 20, 3:18 PM EDT | Severe Thunderstorm Warning | FFC | Bibb | 57 min |
| Jul 20, 3:29 PM EDT | Severe Thunderstorm Warning | FFC | Houston, Peach | 46 min |
| Jul 20, 3:39 PM EDT | Severe Thunderstorm Warning | FFC | Twiggs | 51 min |
| Jul 20, 3:55 PM EDT | Severe Thunderstorm Warning | FFC | Wilkinson | 50 min |
| Jul 20, 4:09 PM EDT | Severe Thunderstorm Warning | FFC | Bleckley, Laurens | 66 min |
| Jul 20, 4:20 PM EDT | Severe Thunderstorm Warning | FFC | Dodge | 55 min |
| Jul 20, 4:26 PM EDT | Severe Thunderstorm Warning | FFC | Johnson, Washington | 64 min |
| Jul 20, 4:50 PM EDT | Severe Thunderstorm Warning | FFC | Montgomery, Treutlen, Wheeler | 55 min |
| Jul 20, 5:10 PM EDT | Severe Thunderstorm Warning | FFC | Dodge, Wilcox | 21 min |
| Jul 20, 5:32 PM EDT | Severe Thunderstorm Warning | JAX | Coffee, Jeff Davis | 43 min |
| Jul 20, 6:29 PM EDT | Severe Thunderstorm Warning | JAX | Bacon, Pierce | 61 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, 5.8 hours before the alert went out and 135 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
- 652 J/kg
- Mixed-layer CIN
- -112 J/kg
- Mixed-layer LCL
- 992 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 42 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 |
|---|---|---|---|---|
| Jul 20, 11:02 AM EDT | Mesoscale Discussion | SPC | Bartow, Carroll, Cherokee, Clayton, Cobb, Coweta and 9 more | 88 min |
| Jul 20, 11:21 AM EDT | Severe Thunderstorm Watch | SPC | Bartow, Carroll, Chattahoochee, Chattooga, Cobb, Coweta and 22 more | 8 hr |
| Jul 20, 1:11 PM EDT | Mesoscale Discussion | SPC | Baldwin, Ben Hill, Bibb, Bleckley, Butts, Crawford and 34 more | 94 min |
| Jul 20, 1:52 PM EDT | Mesoscale Discussion | SPC | Burke, Columbia, Glascock, Jefferson, Jenkins, Lincoln and 5 more | 83 min |
| Jul 20, 3:02 PM EDT | Severe Thunderstorm Watch | SPC | Brantley, Bryan, Bulloch, Burke, Candler, Chatham and 15 more | 7 hr |
| Jul 20, 3:55 PM EDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 71 more | 2 hr |
| Jul 20, 7:34 PM EDT | Mesoscale Discussion | SPC | Brantley, Camden, Charlton, Chatham, Glynn, Liberty and 4 more | 56 min |
Nearby
Severe Thunderstorm Watches in Georgia, 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; radar from the NEXRAD Level II archive.