Scattered thunderstorms developed in the afternoon hours along the sea breeze. These thunderstorms produced hail in Berkeley County.
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 CHS wrote it up.
Scattered thunderstorms developed in the afternoon hours along the sea breeze. These thunderstorms produced hail in Berkeley County.
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 Charleston, SC wrote its last area forecast discussion before the first event at Jul 15, 3:13 PM EST, 1 hour 18 minutes earlier.
Area Forecast Discussion National Weather Service Charleston SC 413 PM EDT Sat Jul 15 2017 .SYNOPSIS... Between Atlantic and inland high pressure, a weak trough of low pressure will persist over the Southeast into next weekend. && .NEAR TERM /UNTIL 6 AM SUNDAY MORNING/... Until Sunset: Radar shows showers and thunderstorms ongoing across most of the area. These storms have been tapping into MLCAPEs of at least 2,000 J/kg in areas where PWATs are ~2". Convection is expected to continue, especially in areas that have yet to receive any convection. SPC meso analysis indicates MLCAPEs in these area is ~2,500 J/kg. The sea breeze and cold pool boundaries will drive a lot of this pulse convection. DCAPES approaching 1,200 J/kg will continue to equate to a damaging wind threat. Most of the storms are generating heavy rainfall, but at least they're moving at a decent speed to limit the flooding threat. If any training does occur, then flood advisories may be needed. Tonight: Heights will lower as mid-level troughing moves southward and over our region. Additionally, short waves are forecasted to round the base of this trough, passing nearby or over us late. At the surface, the weak cold front over the Appalachians will continue to drift southward, weakening as it does so. Moisture will remain high across the area, with PWATs ~2". Despite the nighttime hours, instability will remain in place over land. The GFS suggests LI's approaching -5, BLCAPEs exceeding 1,000 J/kg, and Showalters approaching -4. Given all of the factors, convection is expected to persist overnight, with the highest probabilities being across the Charleston Tri- County, lowering as one heads southward. There could be a brief window where there is very little convection, but that will get refined in the upcoming hours. It's still not out of the question that we could get high wind gusts in the strongest storms. But the overall severe threat should remain low. Again, the storms could generate heavy rainfall and move little given the light winds aloft. If any training does occur, then flood advisories may be needed. Low temperatures will be in the mid 70s to near 80 degrees, but this is highly depending on the timing and coverage of convection. && .SHORT TERM /6 AM SUNDAY MORNING THROUGH TUESDAY/... Sunday through Monday: A plume of PWATs 2-2.25 inches will settle over the region as an upper trough amplifies toward the Southeast. Within this regime, showers/thunderstorms could develop and/or move into the region at any time. Greatest coverage of showers / thunderstorms, justifying at least likely POPs, should occur from the late morning/early afternoon into the evening hours. Given deep- layered moisture and weak tropospheric flow, a few thunderstorms could produce excessive rainfall/localized flooding. Also, isolated thunderstorms could briefly become severe with damaging wind gusts, especially Sunday. Meanwhile, cloud cover/precipitation will hold temps below those of Sunday afternoon. Tuesday: The upper trough will continue to press S/E, but deepest moisture will retreat offshore, replaced by slightly drier air. However, the environment will likely not dry sufficiently to prevent decent coverage of diurnal showers/thunderstorms, and the latest forecast includes high chance POPs Tuesday afternoon. && .LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/... Troughing aloft weakens by mid-week as deep layer ridging gradually builds in from the west through the rest of the period. The general trend through this period will be decreasing POPs from near climo Tuesday to below climo late in the week, in mainly isolated convection along the sea breeze each day. As is typical with this pattern, a few strong to severe storms would be possible each afternoon, but there are no indications of any significant/widespread severe weather threat. Temps will also trend above climo as stronger ridging builds in late in the week. && .AVIATION /19Z SATURDAY THROUGH THURSDAY/... Showers and thunderstorms have developed across the area and are expected to impact the airports over the upcoming hours. VCTS and TEMPOs will cover this potential, with amendments being made as radar trends develop. Temporary flight restrictions to at least MVFR can be expected with any SHRA/TSRA that directly impact the airports. SHRA will persist into tonight, mainly at KCHS due to boundary interactions and energy aloft moving in. Another round of SHRA/TSRA is expected to develop towards the end of the TAF period. Extended Aviation Outlook: Flight restrictions are possible within showers and thunderstorms at both KSAV and KCHS, especially Sunday through Tuesday. && .MARINE... Tonight: The coastal waters will remain between the extreme western periphery of the Atlantic surface high with a weak cold front over the Appalachians drifting southward and weakening. Winds will generally be from the SW 10-15 kt, veering and weakening slightly by daybreak as the land breeze develops. Seas will average 2-4 ft. Sunday through Thursday: Outside thunderstorms which will produce localized hazardous conditions and will alter local winds, southerly winds 20 knots or less and associated seas of 1 to 3 feet will prevail. Thunderstorms will be common Sunday through Tuesday; then, coverage of thunderstorms should increase mid to late week. && .CHS WATCHES/WARNINGS/ADVISORIES... GA...None. SC...None. MARINE...None. && NEAR TERM... SHORT TERM... LONG TERM... AVIATION... MARINE...
Hazardous Weather Outlook National Weather Service Charleston SC 340 PM EDT Sat Jul 15 2017 GAZ087-088-099>101-114>119-137>141-SCZ040-042>045-047>052-161945- Jenkins-Screven-Candler-Bulloch-Effingham-Tattnall-Evans- Inland Bryan-Coastal Bryan-Inland Chatham-Coastal Chatham-Long- Inland Liberty-Coastal Liberty-Inland McIntosh-Coastal McIntosh- Allendale-Hampton-Inland Colleton-Dorchester-Inland Berkeley- Inland Jasper-Beaufort-Coastal Colleton-Charleston-Coastal Jasper- Tidal Berkeley- 340 PM EDT Sat Jul 15 2017 This Hazardous Weather Outlook is for southeast Georgia and southeast South Carolina. .DAY ONE...This Afternoon and Tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Severe thunderstorms and heavy rain: Numerous thunderstorms are expected Sunday, especially from late morning into the evening. Isolated thunderstorms could briefly become severe with damaging wind gusts. Also, some thunderstorms will produce very heavy rain, and localized flooding is possible. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time. AMZ330-350-352-354-374-161945- Charleston Harbor- Waters from South Santee River to Edisto Beach SC out 20 nm- Waters from Edisto Beach SC to Savannah GA out 20 nm- Waters from Savannah GA to Altamaha Sound GA out 20 nm...including Grays Reef National Marine Sanctuary- Waters from Savannah GA to Altamaha Sound GA extending from 20 to 60 nm- 340 PM EDT Sat Jul 15 2017 This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...This Afternoon and Tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Strong thunderstorms: Thunderstorms will impact coastal waters Sunday into Monday. Some thunderstorms could produce hazardous conditions for small craft, including strong wind gusts, rough seas, frequent cloud to water lightning and poor visibility in heavy rainfall. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time.
Special Weather Statement
National Weather Service Charleston SC
417 PM EDT SAT JUL 15 2017
GAZ116-138-152045-
Inland Liberty-Inland Bryan-
417 PM EDT SAT JUL 15 2017
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF LIBERTY COUNTY...
At 417 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorm over Riceboro, or 12 miles southeast of
Hinesville, moving south at 20 mph.
HAZARD...strong winds 45 to 55 mph, up to nickel sized hail and
excessive cloud to ground lightning.
IMPACT...Expect minor damage to tree limbs and blowing around of
light, unsecured objects. Minor hail damage to plants,
trees and crops is possible. Damage to windshields is
unlikely. All outdoor activities should cease. Move
indoors immediately.
Some locations in the path of this storm include...
Riceboro and Retreat.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm and may lead to
flooding of low lying and poor drainage areas. Do not drive your
vehicle through flooded roadways.
Report damage directly to the Charleston National Weather Service at
1-888-383-2024 when it is safe to do so. You can also email your
report to nws.charlestonsc@noaa.gov.
&&
LAT...LON 3173 8154 3189 8145 3184 8135 3183 8136
3182 8132 3181 8132 3179 8131 3180 8129
3179 8127 3166 8136
TIME...MOT...LOC 2017Z 021DEG 16KT 3177 8141
NEDSpecial Weather Statement
National Weather Service Charleston SC
445 PM EDT SAT JUL 15 2017
SCZ045-152115-
Inland Berkeley-
445 PM EDT SAT JUL 15 2017
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BERKELEY COUNTY...
...MARINERS SHOULD REMAIN OFF LAKE MOULTRIE AND IN SAFE HARBOR...
At 444 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorm over Southern Lake Moultrie, or 8 miles north of
Moncks Corner, moving southeast at 15 mph.
HAZARD...strong winds 45 to 55 mph and up to penny sized hail.
IMPACT...Expect minor damage to tree limbs and blowing around of
light, unsecured objects. Minor hail damage to plants,
trees and crops is possible. Damage to windshields is
unlikely.
Some locations in the path of this storm include...
Moncks Corner, St. Stephen, Bonneau, Southern Lake Moultrie,
Eadytown, Cross, Northern Lake Moultrie and Bonneau Beach.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Boaters should remain off Lake Moultrie and in safe harbor.
Excessive cloud to ground lightning is occurring with this storm.
Lightning can strike 15 miles away from a thunderstorm. Seek safe
shelter inside a building or vehicle.
&&
LAT...LON 3349 7995 3345 7988 3343 7987 3343 7988
3340 7986 3337 7981 3315 7999 3332 8025
3351 8005 3351 8002 3350 8002 3351 8001
3351 7999
TIME...MOT...LOC 2044Z 298DEG 15KT 3331 8006Special Weather Statement
National Weather Service Charleston SC
501 PM EDT SAT JUL 15 2017
SCZ045-052-152130-
Inland Berkeley-Tidal Berkeley-
501 PM EDT SAT JUL 15 2017
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BERKELEY COUNTY...
At 500 PM EDT, National Weather Service doppler radar indicated
strong thunderstorms extending from near Old Santee Canal State Park
to near Naval Weapons Station Charleston to Honey Hill, moving
northeast at 15 mph.
HAZARD...strong winds 45 to 55 mph, up to nickel sized hail and
excessive cloud to ground lightning.
IMPACT...Expect minor damage to tree limbs and blowing around of
light, unsecured objects. Minor hail damage to plants,
trees and crops is possible. Damage to windshields is
unlikely. All outdoor activities should cease. Move
indoors immediately.
Some locations in the path of these storms include...
Charleston, Goose Creek, Moncks Corner, St. Stephen, Bonneau,
Jamestown, Old Santee Canal State Park and Huger.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with these storms and may lead
to flooding of low lying and poor drainage areas. do not drive your
vehicle through flooded roadways.
&&
LAT...LON 3343 7987 3340 7985 3337 7980 3338 7979
3332 7974 3327 7956 3324 7950 3325 7948
3321 7945 3319 7949 3314 7952 3316 7956
3313 7964 3305 7970 3292 7994 3322 8000
3347 7993
TIME...MOT...LOC 2100Z 199DEG 13KT 3322 7994 3301 7991Special Weather Statement
National Weather Service Charleston SC
504 PM EDT SAT JUL 15 2017
SCZ043-049-152130-
Coastal Colleton-Inland Colleton-
504 PM EDT SAT JUL 15 2017
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF COLLETON COUNTY...
At 503 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorm over White Hall, or 10 miles south of Walterboro,
moving east at 10 mph.
HAZARD...strong winds 45 to 55 mph and up to penny sized hail.
IMPACT...Expect minor damage to tree limbs and blowing around of
light, unsecured objects. Minor hail damage to plants,
trees and crops is possible. Damage to windshields is
unlikely.
Some locations in the path of this storm include...
Walterboro, Hendersonville, Round O, Green Pond, Ashepoo, Ritter and
White Hall.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm and may lead to
flooding of low lying and poor drainage areas. Do not drive your
vehicle through flooded roadways.
Report damage directly to the Charleston National Weather Service at
1-888-383-2024 when it is safe to do so. You can also email your
report to nws.charlestonsc@noaa.gov.
&&
LAT...LON 3271 8078 3292 8074 3294 8052 3264 8054
TIME...MOT...LOC 2103Z 274DEG 8KT 3276 8069PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
512 PM EDT SAT JUL 15 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0454 PM TSTM WND GST 3 E SOUTHERN LAKE MOULT 33.27N 80.01W
07/15/2017 M55 MPH BERKELEY SC PUBLIC
THE PUBLIC REPORTED A 55 MPH WIND GUST ON A BOAT IN
LAKE MOULTRIE JUST OFF OF SHORT STAY.
&&
EVENT NUMBER CHS1700443
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</html>The Charleston,SC radar (KCLX), 107 km away, was scanning. The volume nearest the first event began at 21:31 UTC.
1 hail. Local standard time, as filed.
The media relayed a Twitter report of pea to nickel sized hail near the intersection of Cypress Gardens road and Old Highway 52.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Carolina in 2017Every state in 2017This day in weather historyWarnings in South Carolina, July 2017
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 2026-10-01. Each event’s entry at NCEI: 714837.