Alert archive / South Carolina / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 274
The Storm Prediction Center issued this severe thunderstorm watch at Jun 15, 2021, 1:58 PM EDT for 18 counties in North Carolina; 20 counties in South Carolina. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 15, 2021, 1:58 PM EDT (17:58 UTC)
- Expired
- Jun 15, 2021, 9:00 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 38 counties
Beaufort County, NC, Bladen County, NC, Brunswick County, NC, Carteret County, NC, Columbus County, NC, Craven County, NC, Dare County, NC, Duplin County, NC, Hyde County, NC, Jones County, NC, Lenoir County, NC, New Hanover County, NC, Onslow County, NC, Pamlico County, NC, Pender County, NC, Robeson County, NC, Tyrrell County, NC, Washington County, NC, Bamberg County, SC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester 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 Wilmington radar (KLTX), 70 km from the middle of the area, began a volume at 18:00 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
- 2%
- Ten or more severe wind reports
- 50%
- 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
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 15, 2:36 PM EDT | Severe Thunderstorm Warning | MHX | Duplin, Jones, Lenoir, Onslow | 24 min |
| Jun 15, 2:54 PM EDT | Severe Thunderstorm Warning | MHX | Carteret, Craven, Jones, Onslow | 51 min |
| Jun 15, 3:12 PM EDT | Severe Thunderstorm Warning | ILM | Florence, Horry, Marion | 48 min |
| Jun 15, 3:30 PM EDT | Severe Thunderstorm Warning | MHX | Carteret, Craven, Jones, Onslow, Pamlico | 30 min |
| Jun 15, 3:34 PM EDT | Severe Thunderstorm Warning | ILM | New Hanover, Pender | 26 min |
| Jun 15, 3:54 PM EDT | Severe Thunderstorm Warning | ILM | Horry | 36 min |
| Jun 15, 4:12 PM EDT | Severe Thunderstorm Warning | ILM | Brunswick, Columbus | 63 min |
| Jun 15, 4:37 PM EDT | Severe Thunderstorm Warning | CHS | Berkeley, Dorchester | 38 min |
| Jun 15, 5:59 PM EDT | Severe Thunderstorm Warning | CAE | Calhoun, Clarendon, Orangeburg | 31 min |
| Jun 15, 6:27 PM EDT | Severe Thunderstorm Warning | CAE | Calhoun, Clarendon, Orangeburg | 48 min |
| Jun 15, 7:00 PM EDT | Severe Thunderstorm Warning | CHS | Berkeley | 45 min |
| Jun 15, 7:46 PM EDT | Severe Thunderstorm Warning | CHS | Berkeley, Charleston | 59 min |
| Jun 15, 8:02 PM EDT | Severe Thunderstorm Warning | CHS | Charleston, Colleton | 37 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
Newport, NC (KMHX), launched 12:00Z, 6.0 hours before the alert went out and 97 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
- 1287 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 947 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 78 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.4
The text
As transmitted.
009
WWUS20 KWNS 151755
SEL4
SPC WW 151755
NCZ000-SCZ000-CWZ000-152300-
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 274
NWS Storm Prediction Center Norman OK
200 PM EDT Tue Jun 15 2021
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southern to eastern North Carolina
Central to eastern South Carolina
Coastal Waters
* Effective this Tuesday afternoon and evening from 200 PM until
700 PM EDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 75
mph possible
Isolated very large hail events to 2 inches in diameter possible
SUMMARY...Multiple supercells may consolidate into one or more
clusters towards the Carolina Coast this afternoon.
The severe thunderstorm watch area is approximately along and 55
statute miles north and south of a line from 5 miles north northeast
of Cape Hatteras NC to 20 miles southwest of Orangeburg SC. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU4).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
29030.
...GramsSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 15, 12:57 PM EDT | Mesoscale Discussion | SPC | Anson, Beaufort, Bertie, Bladen, Brunswick, Carteret and 30 more | 63 min |
| Jun 15, 4:09 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bladen, Brunswick, Carteret, Columbus, Craven and 10 more | 96 min |
Nearby
Severe Thunderstorm Watches in South Carolina, 2021Severe Thunderstorm Watches in North Carolina, 2021Every severe thunderstorm watch in 2021
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.