A large cluster of thunderstorms developed along the sea breeze boundary in the mid afternoon and produced large hail and damaging winds across portions of southeast South Carolina. These thunderstorms produced outflow boundaries that eventually initiated additional thunderstorms across portions of southeast Georgia.
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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.
A large cluster of thunderstorms developed along the sea breeze boundary in the mid afternoon and produced large hail and damaging winds across portions of southeast South Carolina. These thunderstorms produced outflow boundaries that eventually initiated additional thunderstorms across portions of southeast Georgia.
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 19, 6:30 PM EST, 4 minutes earlier.
Area Forecast Discussion National Weather Service Charleston SC 730 PM EDT Wed Jul 19 2017 .SYNOPSIS... An upper low will drift south into early this weekend while a weak surface pressure pattern resides across the region. Atlantic high pressure will remain the dominant weather feature into early next week. && .NEAR TERM /UNTIL 6 AM THURSDAY MORNING/... A well-defined outflow boundary generated by convection over the South Carolina Midlands earlier this afternoon will continue to march south into Southeast Georgia this evening. The airmass ahead of the boundary remains quite unstable with SBCAPE in excess of 3000 J/kg with DCAPE 1000-1300 J/kg. Updated pops to 40-60% for the next several hours across much of Southeast Georgia as high resolution guidance shows convection potentially concentrating in the area south of I-16 and west of I-95 through mid-evening. An isolated severe tstm can not be ruled out in this area given the level of instability, but 0-6km bulk shear remains weak. This suggests the risk for severe tstms will be generally confined to mesoscale boundary interactions. Farther north across Southeast South Carolina, much more stable conditions will be found, but it will take a few more hours for convection to completely wind down. The updated pop forecast reflects this. The 20/00-13z low temperature forecast has been updated to reflect the rain-cooled airmass that has settled in across much of Southeast South Carolina in the wake of earlier convection. && .SHORT TERM /6 AM THURSDAY MORNING THROUGH SATURDAY/... A weak upper low will saunter south from near the Carolina coast towards northern Florida as surface lee troughing becomes established inland. Being situated between this inland trough and the Bermuda High offshore will result in persistent south to southwest surface flow, keeping sufficient low-level moisture over the area. Mainly isolated coverage of showers and thunderstorms is anticipated, primarily each afternoon along the seabreeze, barring any mesoscale influences. Slightly above normal temperatures are expected. && .LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/... Large-scale ridging will be overhead for the first part of the week before modest height falls occur mid week in response to a trough passing north of the area. Atlantic high pressure will remain in control at the surface, with strengthening inland troughing promoting stronger moisture advection. POPs will trend from below climo Sunday toward more normal values by middle of next week as the deep layer ridging weakens. Temps will likewise trend toward normal through the period. && .AVIATION /00Z THURSDAY THROUGH MONDAY/... Mainly VFR. Tstms will be in the KSAV terminal 00-01z with localized IFR to MVFR conditions possible. Extended Aviation Outlook: VFR conditions will prevail. && .MARINE... Tonight: A weak low-level pressure pattern expected over the waters through tonight as an upper low pressure system moves south over the coastal waters. No significant winds/seas are anticipated across the local waters outside thunderstorms which are more likely near the SC coast through this evening and again late tonight. Wednesday through Sunday: Coastal waters will remain on the western periphery of the Bermuda High through the period. Primarily S to SW winds between 5 and 10 knots are expected, with seas ranging 2 to 4 feet, with some gustiness possible each afternoon due to the seabreeze. A strengthening inland trough may result in sufficient tightening of the pressure gradient to raise winds to 15 to 20 knots this weekend into early next week, but at this time conditions appear to remain below Small Craft Advisory criteria. && .TIDES/COASTAL FLOODING... Elevated tide levels late this week into early next week due to the lunar perigee and new moon will result in the possibility for minor coastal flooding during the evening high tides, especially along the SC coast. && .CHS WATCHES/WARNINGS/ADVISORIES... GA...None. SC...None. MARINE...None. &&
Hazardous Weather Outlook National Weather Service Charleston SC 958 AM EDT Wed Jul 19 2017 GAZ117-119-139-141-SCZ048>051-201400- Coastal Bryan-Coastal Chatham-Coastal Liberty-Coastal McIntosh- Beaufort-Coastal Colleton-Charleston-Coastal Jasper- 958 AM EDT Wed Jul 19 2017 This Hazardous Weather Outlook is for southeast Georgia and southeast South Carolina. .DAY ONE...Today and Tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Coastal Flooding: Tide levels will be elevated late this week into early next week due to the lunar perigee and new moon. Minor saltwater flooding of low-lying areas could occur during the evening high tides, and Coastal Flood Advisories may be needed. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time. AMZ330-350-352-354-374-GAZ087-088-099>101-114>116-118-137-138-140- SCZ040-042>045-047-052-201400- 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-Jenkins-Screven-Candler-Bulloch-Effingham-Tattnall-Evans- Inland Bryan-Inland Chatham-Long-Inland Liberty-Inland McIntosh- Allendale-Hampton-Inland Colleton-Dorchester-Inland Berkeley- Inland Jasper-Tidal Berkeley- 958 AM EDT Wed Jul 19 2017 This Hazardous Weather Outlook is for Atlantic coastal waters, southeast Georgia and southeast South Carolina. .DAY ONE...Today and Tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
614 PM EDT WED JUL 19 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0557 PM TSTM WND GST MARINE CORPS AIR STATIO 32.49N 80.70W
07/19/2017 M55 MPH BEAUFORT SC ASOS
THE ASOS AT THE BEAUFORT MARINE CORPS AIR STATION
MEASURED A 48 KNOT WIND GUST.
&&
EVENT NUMBER CHS1700480
BSHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
615 PM EDT WED JUL 19 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0604 PM MARINE TSTM WIND 1 SW FOLLY BEACH 32.65N 79.94W
07/19/2017 M39 MPH AMZ350 SC MESONET
THE WEATHERFLOW SITE AT THE FOLLY BEACH PIER MEASURED A
34 KNOT WIND GUST.
&&
EVENT NUMBER CHS1700481
BSHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
618 PM EDT WED JUL 19 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0617 PM HAIL MARINE CORPS AIR STATIO 32.47N 80.72W
07/19/2017 E0.25 INCH BEAUFORT SC PUBLIC
PUBLIC REPORT OF PEA SIZED HAIL AT THE MARINE CORPS AIR
STATION.
&&
EVENT NUMBER CHS1700482
BSHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
647 PM EDT WED JUL 19 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0608 PM MARINE TSTM WIND 5 ESE DEWEES ISLAND 32.81N 79.63W
07/19/2017 M43 MPH AMZ350 SC BUOY
THE CORMP BUOY NEAR CAPERS ISLAND MEASURED A 37 KNOT
WIND GUST.
&&
EVENT NUMBER CHS1700483
BSHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
651 PM EDT WED JUL 19 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0510 PM TSTM WND DMG 3 ENE CROWFIELD PLANTAT 33.03N 80.02W
07/19/2017 BERKELEY SC PUBLIC
A PUBLIC REPORT OF TREES AND LARGE TREE LIMBS DOWN ON
EVERGREEN MAGNOLIA AVENUE.
&&
EVENT NUMBER CHS1700484
BSHSpecial Weather Statement
National Weather Service Charleston SC
711 PM EDT WED JUL 19 2017
GAZ101-118-119-SCZ047-048-051-192345-
Effingham-Coastal Chatham-Inland Chatham-Inland Jasper-Coastal
Jasper-Beaufort-
711 PM EDT WED JUL 19 2017
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF EFFINGHAM...
CHATHAM...BEAUFORT AND JASPER COUNTIES...
At 711 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorm near Hardeeville, or 10 miles north of Bellinger
Hill Area, moving southwest at 15 mph.
HAZARD...strong winds 45 to 55 mph, up to penny 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...
Bluffton, Bellinger Hill Area, Rincon, Port Wentworth, Hardeeville,
Purysburgh, Monteith and Pritchardville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This storm may intensify. Be certain to monitor local radio and TV
stations as well as local cable TV outlets for additional information
and possible warnings from the National Weather Service.
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 3224 8129 3239 8108 3228 8090 3208 8105
3208 8106
TIME...MOT...LOC 2311Z 040DEG 12KT 3231 8103The Charleston,SC radar (KCLX), 53 km away, was scanning. The volume nearest the first event began at 23:34 UTC.
3 thunderstorm wind, 2 hail. Local standard time, as filed.
Effingham County dispatch reported a tree down on Midland road near Highway 17.
Local media relayed a report of multiple trees down in the Dashers Landing subdivision near Rincon. Report was received via Twitter.
A trained spotter reported hail up to the size of pennies in the 700 block of Zittrouer Road.
Bryan County dispatch reported a large tree branch down on Toni Branch Road.
A Twitter user reported hail slightly larger than quarter sized in the Stonegate subdivision.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Georgia in 2017Every state in 2017This day in weather historyWarnings in Georgia, 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 2026-09-24. Each event’s entry at NCEI: 715201, 715202, 715199, 715203, 715200.