A weak upper short wave combined with daytime heating to produce a few severe thunderstorms.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CAE wrote it up.
A weak upper short wave combined with daytime heating to produce a few severe thunderstorms.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Columbia, SC wrote its last area forecast discussion before the first event at Jun 23, 1:15 PM EST, 1 hour 3 minutes earlier.
Area Forecast Discussion National Weather Service Columbia SC 215 PM EDT Sat Jun 23 2018 .SYNOPSIS... High pressure will extend from the Atlantic westward into the Gulf of Mexico through Sunday. North of the ridge a weak trough will be in the forecast area. The pattern supports hot conditions with scattered thunderstorms. A backdoor cold front will move into the region Monday. && .NEAR TERM /THROUGH TONIGHT/... Surface high pressure will extend from the Atlantic westward into the Gulf of Mexico through tonight. North of the ridge lee-side troughing will be in the forecast area. The air mass is moist and becoming possibly becoming strongly unstable with ML CAPE above 2500 J/kg by late this afternoon. Of concern is a mesoscale convective system (MCS) moving east across northern Alabama at 17z. Other storms to the east of ATL moving toward the CSRA. Don't think models have been handling the MCS and weak embedded short wave troughs. Deep layer shear appears marginally strong although may increase as MCS approaches. Soundings suggest wind threat with inverted V and relatively high DCAPE around 1000 J/kg. SPC has area in marginal risk Severe thunderstorms The latest HRRR and other high resolution models tend to favor the CSRA through early evening for scattered to possibly numerous showers and thunderstorms although given recent radar trends, scattered thunderstorms possible in the Midlands by early this evening. The Nam model suggests convection will weaken in the Midlands by late evening as nocturnal cooling develops and instability weakens. Raised pops especially south of CAE for late afternoon and early evening. Given weak to moderate instability overnight kept threat of widely scattered showers late into the evening. It will be hot today with highs in the middle and upper 90s. Expect peak heat index values around 102. && .SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/... A mid-level ridge will build into the area Sunday and Monday with 850 mb temps from 20 to 22 degrees C. Temperatures will be above normal with highs in the upper 90s to around 100 degrees and lows in the mid 70s. Heat index values will likely range from 105 to 110 with the warmer values in the CSRA where surface dewpoints will be higher. A heat advisory may be needed for one or both of these days. Subsidence due to weak high pressure, westerly downslope flow, and a mid-level capping inversion will hinder convective development on Sunday. Therefore, only expect isolated shower and thunderstorm coverage in the afternoon. The best chance for scattered thunderstorms will be in the evening as a shortwave moves through the region. Instability will naturally diminish after sunset, but bulk shear will be around 25 kts, so a few stronger storms will also be possible, with damaging wind the biggest threat. On Monday, a cold front will move into the region. The front will likely remain north of the forecast area during the day, continuing the trend of well above normal high temperatures, although it will likely be a few degrees cooler than Sunday. As the front sags southward on Monday evening, another shortwave will accompany it, with scattered thunderstorms that could persist through much of the night. && .LONG TERM /TUESDAY THROUGH SATURDAY/... The front is expected to stall just south of the area on Tuesday, then wash out by Wednesday. Due to increased cloud cover and slightly cooler air behind the front, temperatures will be closer to normal on Tuesday and Wednesday, with highs in the low 90s. There is a good chance of scattered thunderstorms on Tuesday, with lesser chances Wednesday and Thursday due to high pressure ridging, but cannot rule out diurnal convection. Onshore flow and moisture will increase on Friday and Saturday, so precipitation chances will also increase going into next weekend. Basically, showers and thunderstorms will be possible each day. However, exactly when and where the most potent storms will hit cannot be determined with certainty at these time ranges. && .AVIATION /18Z SATURDAY THROUGH THURSDAY/... Expect mainly VFR conditions during the 24-hour TAF period but there will be a chance of thunderstorms especially at the AGS and DNL terminals this afternoon and evening. Showers and thunderstorms over Alabama and Georgia upstream of the terminals associated with mesoscale convective system (MCS). Air mass becoming strongly unstable. Strongest forcing appears to be across the CSRA at least late this afternoon and early evening...so mention tempo thunderstorms at the CSRA terminals. Otherwise scattered to broken cumulus this afternoon with increasing mid level clouds. Gusty west-southwest winds due to 25-30 kt 850mb jet. Winds diminishing after 00z. Nocturnal cooling should result in more limited convection after 03z by slight chance shower or thunderstorms through at least 06z. VFR conditions through early morning as instability and mixing limiting the risk of fog. EXTENDED AVIATION OUTLOOK...Restrictions possible each day in early morning fog and afternoon and evening thunderstorms. && .CAE WATCHES/WARNINGS/ADVISORIES... GA...None. SC...None. &&
Hazardous Weather Outlook National Weather Service Columbia SC 348 AM EDT Sat Jun 23 2018 GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-240800- Lincoln-McDuffie-Columbia-Richmond-Burke-Lancaster-Chesterfield- McCormick-Newberry-Fairfield-Kershaw-Edgefield-Saluda-Lexington- Richland-Lee-Aiken-Sumter-Barnwell-Orangeburg-Calhoun-Clarendon- Bamberg- 348 AM EDT Sat Jun 23 2018 This Hazardous Weather Outlook is for the Midlands of South Carolina and the Central Savannah River area of Georgia. .DAY ONE...Today and Tonight. Widely scattered thunderstorms will occur today and tonight. A few of the thunderstorms could possibly contain damaging wind this afternoon into tonight. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Heat index values from 105 to 110 degrees are possible Sunday and Monday. A heat advisory may be needed. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
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</html>Special Weather Statement
National Weather Service Columbia SC
246 PM EDT SAT JUN 23 2018
GAZ064-065-077-SCZ025-030-231915-
Burke GA-Richmond GA-Columbia GA-Aiken SC-Edgefield SC-
246 PM EDT SAT JUN 23 2018
...Strong Thunderstorms Will Impact Portions of northwestern Burke...
Richmond...Columbia...southwestern Aiken and southwestern Edgefield
Counties Until 315 PM EDT....
At 245 PM EDT...National Weather Service doppler radar indicated a
strong thunderstorm near Hephzibah, or near Fort Gordon, moving east
at 30 mph.
HAZARD...gusty winds 35 to 40 mph.
IMPACT...expect minor damage to tree limbs and blowing around of
light, unsecured objects.
Some locations in the path of this storm include...
North Augusta, Grovetown, Evans, Augusta, Martinez, Clearwater, Fort
Gordon, Belvedere, Hephzibah, Harlem, Jackson, Gloverville,
Burnettown, Blythe, Keysville and Murphys Estates.
This includes the following highways...
Interstate 20 in Georgia between mile markers 179 and 201.
Interstate 20 in South Carolina between mile markers 0 and 11.
Interstate 520 in Georgia between mile markers 1 and 15.
Interstate 520 in South Carolina between mile markers 16 and 23.
LAT...LON 3364 8220 3359 8213 3363 8210 3366 8213
3374 8190 3328 8168 3318 8225 3323 8223
3327 8226 3328 8230 3333 8232 3336 8230
3346 8238 3350 8240 3353 8239 3354 8242
3356 8243
TIME...MOT...LOC 1845Z 248DEG 28KT 3332 8215
awpSpecial Weather Statement
National Weather Service Columbia SC
317 PM EDT SAT JUN 23 2018
SCZ025-030-035-231945-
Barnwell SC-Aiken SC-Edgefield SC-
317 PM EDT SAT JUN 23 2018
...Strong Thunderstorms Will Impact Portions of central Barnwell...
Aiken and south central Edgefield Counties Until 345 PM EDT....
At 317 PM EDT...National Weather Service doppler radar indicated
strong thunderstorms along a line extending from near Belvedere to
near Jackson, moving east at 35 mph.
HAZARD...strong winds 45 to 55 mph and pea sized hail.
IMPACT...expect minor damage to tree limbs and blowing around of
light, unsecured objects.
Some locations in the path of these storms include...
Aiken, North Augusta, Barnwell, Savannah River Site, Clearwater,
Belvedere, Williston, New Ellenton, Jackson, Gloverville, Burnettown,
Snelling, Windsor and Murphys Estates.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
These storms may intensify. Monitor NOAA Weather Radio, local radio
and television stations for additional information and possible
warnings from the National Weather Service.
&&
This includes the following highways...
Interstate 20 in South Carolina between mile markers 2 and 29.
Interstate 520 in Georgia near mile marker 15.
Interstate 520 in South Carolina between mile markers 16 and 23.
LAT...LON 3322 8178 3321 8180 3324 8184 3326 8185
3326 8183 3329 8186 3331 8184 3331 8188
3343 8193 3344 8191 3348 8196 3365 8204
3373 8157 3321 8132 3319 8176
TIME...MOT...LOC 1917Z 269DEG 32KT 3361 8197 3326 8178
JAQThe Columbia radar (KCAE), 87 km away, was scanning. The volume nearest the first event began at 19:18 UTC.
2 thunderstorm wind. Local standard time, as filed.
Public report of one tree down on Old Sudlow Lake Road near the intersection with Richland Road.
Saluda County Emergency Manager reported a tree down in Ridge Spring. Estimated 180 customers without power in and around the community.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Carolina in 2018Every state in 2018This day in weather historyWarnings in South Carolina, June 2018
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 760553, 760554.