Alert archive / Georgia / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 16
The Storm Prediction Center issued this severe thunderstorm watch at Mar 20, 2018, 1:51 AM EDT for 22 counties in Georgia; 12 counties in South Carolina. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 20, 2018, 1:51 AM EDT (05:51 UTC)
- Expired
- Mar 20, 2018, 6:11 AM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 34 counties
Bryan County, GA, Bulloch County, GA, Burke County, GA, Candler County, GA, Chatham County, GA, Columbia County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Jenkins County, GA, Laurens County, GA, Liberty County, GA, Long County, GA, McDuffie County, GA, McIntosh County, GA, Montgomery County, GA, Richmond County, GA, Screven County, GA, Tattnall County, GA, Toombs County, GA, Treutlen County, GA, Wheeler County, GA, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Edgefield County, SC, Hampton County, SC, Jasper County, SC
The radar
The Charleston,SC radar (KCLX), 66 km from the middle of the area, began a volume at 05:52 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
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 20, 1:56 AM EDT | Severe Thunderstorm Warning | CAE | Burke, Columbia, Richmond | 52 min |
| Mar 20, 2:26 AM EDT | Severe Thunderstorm Warning | CAE | Burke | 79 min |
| Mar 20, 2:30 AM EDT | Severe Thunderstorm Warning | CAE | Burke, Richmond | 60 min |
| Mar 20, 2:46 AM EDT | Severe Thunderstorm Warning | FFC | Emanuel, Jefferson, Washington | 44 min |
| Mar 20, 2:50 AM EDT | Severe Thunderstorm Warning | CHS | Jenkins, Screven | 55 min |
| Mar 20, 3:08 AM EDT | Severe Thunderstorm Warning | CAE | Burke | 29 min |
| Mar 20, 3:42 AM EDT | Severe Thunderstorm Warning | CHS | Allendale, Colleton, Hampton | 63 min |
| Mar 20, 3:44 AM EDT | Tornado Warning | CHS | Allendale, Hampton | 31 min |
| Mar 20, 4:26 AM EDT | Severe Thunderstorm Warning | CHS | Beaufort, Charleston, Colleton, Hampton, Jasper | 64 min |
| Mar 20, 4:42 AM EDT | Severe Thunderstorm Warning | CHS | Bulloch, Jenkins, Screven | 48 min |
| Mar 20, 5:11 AM EDT | Severe Thunderstorm Warning | CHS | Berkeley, Charleston | 35 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, 5.9 hours before the alert went out and 164 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
- 50 J/kg
- Mixed-layer CIN
- -156 J/kg
- Mixed-layer LCL
- 793 m above ground
- 0-6 km bulk shear
- 72 kt
- 0-1 km storm-relative helicity
- 99 m²/s²
- 0-3 km storm-relative helicity
- 234 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 19, 8:45 PM EDT | Mesoscale Discussion | SPC | Baldwin, Bartow, Bibb, Butts, Carroll, Chattooga and 40 more | 60 min |
| Mar 19, 9:08 PM EDT | Tornado Watch | SPC | Baldwin, Barrow, Bartow, Bibb, Butts, Carroll and 48 more | 7 hr |
| Mar 19, 9:51 PM EDT | Mesoscale Discussion | SPC | Carroll, Douglas, Haralson, Paulding, Polk | 84 min |
| Mar 20, 12:32 AM EDT | Mesoscale Discussion | SPC | Bulloch, Burke, Candler, Columbia, Effingham, Jenkins and 2 more | 88 min |
| Mar 20, 2:36 AM EDT | Mesoscale Discussion | SPC | Baldwin, Bibb, Crawford, Glascock, Harris, Jefferson and 12 more | 84 min |
| Mar 20, 4:54 AM EDT | Mesoscale Discussion | SPC | Bryan, Bulloch, Candler, Chatham, Effingham, Emanuel and 12 more | 96 min |
| Mar 20, 9:50 AM EDT | Mesoscale Discussion | SPC | Camden, Charlton | 55 min |
| Mar 20, 10:24 AM EDT | Tornado Watch | SPC | Camden, Charlton | 9 hr |
| Mar 20, 12:05 PM EDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Brantley, Bryan, Bulloch and 23 more | 55 min |
| Mar 20, 12:43 PM EDT | Tornado Watch | SPC | Appling, Bacon, Brantley, Bryan, Bulloch, Charlton and 13 more | 7 hr |
| Mar 20, 1:00 PM EDT | Mesoscale Discussion | SPC | Camden, Charlton, Echols | 60 min |
| Mar 20, 2:48 PM EDT | Mesoscale Discussion | SPC | Brantley, Bryan, Camden, Charlton, Chatham, Clinch and 9 more | 87 min |
| Mar 20, 4:16 PM EDT | Mesoscale Discussion | SPC | Camden, Charlton, Echols | 89 min |
| Mar 20, 6:10 PM EDT | Mesoscale Discussion | SPC | Chatham, Glynn, McIntosh | 65 min |
Nearby
Severe Thunderstorm Watches in Georgia, 2018Severe Thunderstorm Watches in South Carolina, 2018Every severe thunderstorm watch in 2018
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.