Alert archive / Georgia / Severe Thunderstorm Watches in 2013
Severe Thunderstorm Watch 55
The Storm Prediction Center issued this severe thunderstorm watch at Mar 18, 2013, 7:29 PM EDT for 30 counties in Georgia; 8 counties in South Carolina. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 18, 2013, 7:29 PM EDT (23:29 UTC)
- Expired
- Mar 19, 2013, 1:01 AM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 38 counties
Appling County, GA, Bacon County, GA, Bryan County, GA, Bulloch County, GA, Burke County, GA, Candler County, GA, Chatham County, GA, Coffee County, GA, Columbia County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Jeff Davis County, GA, Jenkins County, GA, Johnson County, GA, Laurens County, GA, Liberty County, GA, Long County, GA, McDuffie County, GA, McIntosh County, GA, Montgomery County, GA, Pierce County, GA, Richmond County, GA, Screven County, GA, Tattnall County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Wayne County, GA, Wheeler County, GA, Allendale County, SC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC, Jasper County, SC
The radar
The Charleston,SC radar (KCLX), 90 km from the middle of the area, began a volume at 23:29 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
- 40%
- 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
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 18, 8:20 PM EDT | Severe Thunderstorm Warning | FFC | Dodge, Emanuel, Jefferson, Johnson, Laurens, Montgomery and 4 more | 40 min |
| Mar 18, 8:37 PM EDT | Severe Thunderstorm Warning | CAE | Burke | 38 min |
| Mar 18, 8:44 PM EDT | Severe Thunderstorm Warning | FFC | Dodge, Pulaski, Telfair, Wilcox | 61 min |
| Mar 18, 8:46 PM EDT | Severe Thunderstorm Warning | CHS | Bulloch, Candler, Jenkins, Screven | 59 min |
| Mar 18, 8:53 PM EDT | Severe Thunderstorm Warning | FFC | Emanuel, Montgomery, Toombs, Treutlen, Wheeler | 52 min |
| Mar 18, 9:06 PM EDT | Tornado Warning | CAE | Burke | 39 min |
| Mar 18, 9:25 PM EDT | Severe Thunderstorm Warning | CAE | Burke | 65 min |
| Mar 18, 9:29 PM EDT | Severe Thunderstorm Warning | CHS | Bryan, Bulloch, Candler, Effingham, Evans, Screven and 1 more | 61 min |
| Mar 18, 9:44 PM EDT | Severe Thunderstorm Warning | JAX | Appling, Bacon, Coffee, Jeff Davis | 46 min |
| Mar 18, 9:58 PM EDT | Severe Thunderstorm Warning | CHS | Bryan, Bulloch, Chatham, Effingham, Evans, Liberty | 62 min |
| Mar 18, 10:18 PM EDT | Severe Thunderstorm Warning | CHS | Allendale, Beaufort, Colleton, Dorchester, Hampton, Jasper | 57 min |
| Mar 18, 10:45 PM EDT | Severe Thunderstorm Warning | CHS | Beaufort, Berkeley, Charleston, Colleton, Dorchester, Jasper | 60 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, 11.5 hours before the alert went out and 268 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
- 3 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 540 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 153 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 |
|---|---|---|---|---|
| Mar 18, 1:44 PM EDT | Mesoscale Discussion | SPC | Catoosa, Chattooga, Dade, Walker, Whitfield | 91 min |
| Mar 18, 2:11 PM EDT | Mesoscale Discussion | SPC | Calhoun, Chattahoochee, Clay, Crawford, Early, Harris and 17 more | 94 min |
| Mar 18, 2:31 PM EDT | Severe Thunderstorm Watch | SPC | Bartow, Catoosa, Chattooga, Dade, Floyd, Gordon and 5 more | 8 hr |
| Mar 18, 4:16 PM EDT | Tornado Watch | SPC | Baldwin, Bibb, Bleckley, Butts, Carroll, Chattahoochee and 51 more | 6 hr |
| Mar 18, 5:57 PM EDT | Mesoscale Discussion | SPC | Baldwin, Barrow, Bibb, Bleckley, Butts, Candler and 75 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Georgia, 2013Severe Thunderstorm Watches in South Carolina, 2013Every severe thunderstorm watch in 2013
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.