Alert archive / South Carolina / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 295
The Storm Prediction Center issued this severe thunderstorm watch at May 28, 2017, 7:06 PM EDT for 6 counties in North Carolina; 17 counties in South Carolina. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- May 28, 2017, 7:06 PM EDT (23:06 UTC)
- Expired
- May 28, 2017, 11:16 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 23 counties
Bladen County, NC, Brunswick County, NC, Columbus County, NC, New Hanover County, NC, Pender County, NC, Robeson County, NC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, Orangeburg County, SC, Richland County, SC, Sumter County, SC, Williamsburg County, SC
The radar
The Columbia radar (KCAE), 109 km from the middle of the area, began a volume at 23:06 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
- 10%
- 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
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
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 |
|---|---|---|---|---|
| May 28, 7:06 PM EDT | Severe Thunderstorm Warning | CAE | Kershaw, Lee, Richland, Sumter | 54 min |
| May 28, 7:24 PM EDT | Severe Thunderstorm Warning | CAE | Richland, Sumter | 51 min |
| May 28, 7:26 PM EDT | Severe Thunderstorm Warning | CAE | Aiken, Lexington, Orangeburg, Saluda | 64 min |
| May 28, 7:30 PM EDT | Severe Thunderstorm Warning | ILM | Brunswick, Columbus | 30 min |
| May 28, 7:47 PM EDT | Severe Thunderstorm Warning | ILM | Darlington, Florence, Marion | 43 min |
| May 28, 7:53 PM EDT | Severe Thunderstorm Warning | CAE | Clarendon, Lee, Sumter | 52 min |
| May 28, 8:09 PM EDT | Severe Thunderstorm Warning | CAE | Calhoun, Lexington, Orangeburg, Sumter | 42 min |
| May 28, 8:40 PM EDT | Severe Thunderstorm Warning | ILM | Columbus | 41 min |
| May 28, 8:44 PM EDT | Severe Thunderstorm Warning | CAE | Clarendon, Sumter | 31 min |
| May 28, 8:46 PM EDT | Severe Thunderstorm Warning | ILM | Florence, Georgetown, Williamsburg | 44 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 12:00Z, 11.1 hours before the alert went out and 114 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
- 210 J/kg
- Mixed-layer CIN
- -415 J/kg
- Mixed-layer LCL
- 1333 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 140 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 |
|---|---|---|---|---|
| May 27, 9:00 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Camden, Chowan, Dare, Edgecombe and 11 more | 30 min |
| May 27, 10:46 PM EDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 33 more | 89 min |
| May 28, 12:13 AM EDT | Severe Thunderstorm Watch | SPC | Union | 3 hr |
| May 28, 2:17 AM EDT | Mesoscale Discussion | SPC | Cabarrus, Chatham, Davidson, Davie, Harnett, Hoke and 9 more | 58 min |
| May 28, 2:27 PM EDT | Mesoscale Discussion | SPC | Bertie, Camden, Chowan, Currituck, Gates, Hertford and 5 more | 63 min |
| May 28, 4:56 PM EDT | Mesoscale Discussion | SPC | Bladen, Brunswick, Columbus, Robeson | 2 hr |
| May 27, 11:16 PM EDT | Mesoscale Discussion | SPC | Abbeville, Anderson, Cherokee, Chester, Fairfield, Greenville and 10 more | 89 min |
Nearby
Severe Thunderstorm Watches in South Carolina, 2017Severe Thunderstorm Watches in North Carolina, 2017Every severe thunderstorm watch in 2017
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.