Alert archive / Georgia / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 482
The Storm Prediction Center issued this severe thunderstorm watch at Jun 15, 2011, 9:27 PM EDT for 12 counties in Georgia; 8 counties in South Carolina. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 15, 2011, 9:27 PM EDT (01:27 UTC)
- Expired
- Jun 16, 2011, 3:00 AM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Bryan County, GA, Bulloch County, GA, Candler County, GA, Chatham County, GA, Effingham County, GA, Evans County, GA, Jenkins County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Screven County, GA, Tattnall 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), 51 km from the middle of the area, began a volume at 01:29 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
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 15, 9:41 PM EDT | Severe Thunderstorm Warning | CHS | Jenkins, Screven | 64 min |
| Jun 15, 10:41 PM EDT | Severe Thunderstorm Warning | CHS | Allendale, Colleton, Dorchester, Hampton, Jasper | 64 min |
| Jun 15, 10:45 PM EDT | Severe Thunderstorm Warning | CHS | Bulloch, Candler, Effingham, Screven | 60 min |
| Jun 15, 11:27 PM EDT | Severe Thunderstorm Warning | CHS | Effingham | 63 min |
| Jun 15, 11:30 PM EDT | Severe Thunderstorm Warning | CHS | Berkeley, Charleston, Dorchester | 60 min |
| Jun 15, 11:42 PM EDT | Severe Thunderstorm Warning | CHS | Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 3 more | 63 min |
| Jun 16, 12:10 AM EDT | Severe Thunderstorm Warning | CHS | Colleton, Dorchester | 25 min |
| Jun 16, 12:26 AM EDT | Severe Thunderstorm Warning | CHS | Berkeley, Charleston, Dorchester | 44 min |
| Jun 16, 12:40 AM EDT | Severe Thunderstorm Warning | CHS | Bryan, Bulloch, Chatham, Effingham, Evans, Liberty and 3 more | 65 min |
| Jun 16, 1:40 AM EDT | Severe Thunderstorm Warning | CHS | Bryan, Chatham, Liberty, Long, McIntosh | 65 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
Charleston AFB, SC (KCHS), launched 00:00Z, 1.5 hours before the alert went out and 53 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
- 459 J/kg
- Mixed-layer CIN
- -111 J/kg
- Mixed-layer LCL
- 1117 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 56 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 15, 10:11 PM EDT | Mesoscale Discussion | SPC | Baldwin, Barrow, Bibb, Bryan, Bulloch, Burke and 47 more | 94 min |
| Jun 16, 12:48 AM EDT | Mesoscale Discussion | SPC | Appling, Bacon, Ben Hill, Bleckley, Bryan, Chatham and 24 more | 57 min |
Nearby
Severe Thunderstorm Watches in Georgia, 2011Severe Thunderstorm Watches in South Carolina, 2011Every severe thunderstorm watch in 2011
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.