Strong thunderstorms developed within a warm and moist atmosphere as a weak shortwave passed over Southeast Georgia.
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The episode as NWS CHS wrote it up.
Strong thunderstorms developed within a warm and moist atmosphere as a weak shortwave passed over 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 Jun 17, 5:41 PM EST, 13 minutes earlier.
Area Forecast Discussion National Weather Service Charleston SC 641 PM EDT Sat Jun 17 2017 .SYNOPSIS... The western edge of an Atlantic high will remain over the region through the rest of this weekend. A cold front is forecast to slowly approach on Monday and could become stationary near the coast Tuesday and Wednesday. Atlantic high pressure looks to return during the late week. && .NEAR TERM /UNTIL 6 AM SUNDAY MORNING/... As of 630 PM: Latest SPC mesoanalysis indicated the area over the southern Savannah River Valley has pooled CAPE up to 3500 J/kg. Also, a few pockets of DCAPE around 1000 J/kg have developed across SE GA. A few clusters of outflow based storms have tracked northeast from the Altamaha River valley. So far, one updraft has pushed dBZ to severe thresholds. It remains possible through sunset that a couple of more storms could produce severe weather, with damaging winds being the most likely. The severe weather potential should increase following cell mergers. I will update the forecast to increase PoPs across the Savannah River Valley and offshore waters. In addition, I will populate hourly temperatures with observations, in an effort to capture areas of rain cooled air. Previous Discussion: As noted earlier, considerably drier air now resides across southeast GA and extreme southern SC. Meanwhile the deepest moisture is still across the Charleston tri-county area, along with a multitude of boundaries including the sea breeze. This is where scattered showers and tstms have continually developed. Much of this convection should dissipate by late afternoon or early evening as it extracts much of the available instability from the local area. Meanwhile a lobe of deeper moisture is forecast to move into southeast GA by early evening ahead of a weak shortwave. Some showers are developing across south central GA and may move into our inland GA zones by early evening before dissipating with the loss of daytime heating. Overnight some isolated showers or tstms are possible though coverage will not be very impressive. && .SHORT TERM /6 AM SUNDAY MORNING THROUGH TUESDAY/... Sunday, the mid level low is forecast to slip southward over the northern Gulf of Mexico. The forecast area will remain on the extreme western edge of the Bermuda ridge. Overall, the environment will remain warm and moist, with PW values ranging around 1.9 inches. Afternoon CAPE values are forecast to range from 1500-2000 J/kg with very shallow CIN. Given llvl SW flow and inland temperatures in the upper 80s to low 90s, it appears that a seabreeze will develop by late morning and push westward through the rest of the daylight hours. I will forecast PoPs up to CHC along and west of the seabreeze. On Monday, the axis of a mid level trough is expected to ripple east of the mid Mississippi River valley during the afternoon. To the east, a weak ridge centered near Bermuda will remain across the western Atlantic. GFS indicates that deep moisture should stream northward from FL through the day. Thicker clouds may limit daytime temperatures a few degrees from values reached on Sunday. Overall, lapse rates appear weak, but PWs should range around 2 inches. I will forecast a diurnal peak for high CHC PoPs. On Tuesday, the overall thermal and moisture environment is expected to change very little from Monday. However, a weak cold front will slide over the Piedmont of the Carolinas and Georgia by the afternoon. LFC should lower below 4 kft, convection may easily develop along a seabreeze or along areas of differential heating inland. I will forecast high CHC to low likely PoPs across the forecast area. && .LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/... A weak cold front should stall over or near the Southeast coast Tuesday night into Wednesday, favoring chances of showers and thunderstorms while PWATs remain near 2.0 inches. However, overall coverage will be dependent on the development and track of a low pressure system over the Gulf of Mexico mid week. At this time, it appears the low will remain west of the region while Atlantic high pressure returns over the Southeast late week. This scenario supports chances of showers and thunderstorms each afternoon as a more summer-like pattern returns late week. High temps should be a few degrees below normal on Wednesday, ranging in the mid to upper 80s, followed by a slight warming trend to normal or slightly above normal temps as the Atlantic ridge extends across the Southeast late week. && .AVIATION /00Z SUNDAY THROUGH THURSDAY/... Mainly concerned with scattered convection around KCHS this afternoon. Several nearly stationary boundaries have allowed for meandering convection. Activity should dissipate by early evening. Otherwise VFR at both terminals. Extended Aviation Outlook: Brief flight restrictions are possible with afternoon showers/thunderstorms each day. However, greatest chances appear late Monday into Tuesday as a cold front potentially stalls over the region. && .MARINE... Another typical nocturnal jet tonight, especially along the Charleston County coast with 15 g 20 kt this evening. A decent sea breeze will continue along the coast, especially SC coast where southerly flow has allowed better inland penetration. Sea breeze should taper off by late evening. Monday through mid week: The marine zones will remain between the Bermuda High, with a cold front pushing over the Carolinas and Georgia by Tuesday. Sfc winds through the period are forecast to remain from the SW with speeds less than 20 kts. Wave heights are forecast to range from 1-3 feet within 10 nm, 4 foot waves should be common beyond 10 nm. && .CHS WATCHES/WARNINGS/ADVISORIES... GA...None. SC...None. MARINE...None. && NEAR TERM...NED/JRL SHORT TERM...NED LONG TERM...DPB AVIATION...JRL/NED MARINE...JRL/NED
Hazardous Weather Outlook National Weather Service Charleston SC 421 AM EDT Sat Jun 17 2017 AMZ330-350-352-354-374-GAZ087-088-099>101-114>119-137>141-SCZ040- 042>045-047>052-180830- 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-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- 421 AM EDT Sat Jun 17 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...Sunday through Friday. 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
426 PM EDT SAT JUN 17 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0415 PM HEAVY RAIN 2 ESE GOOSE CREEK 32.97N 80.00W
06/17/2017 E0.00 INCH BERKELEY SC LAW ENFORCEMENT
THE INTERSECTION OF RED BANK ROAD AND NORTH RHETT
AVENUE WAS IMPASSIBLE DUE TO SIGNFICANT PONDING OF
WATER.
&&
EVENT NUMBER CHS1700361
NEDSpecial Weather Statement
National Weather Service Charleston SC
550 PM EDT SAT JUN 17 2017
GAZ116-117-137-138-172230-
Inland Liberty-Inland Bryan-Coastal Bryan-Long-
550 PM EDT SAT JUN 17 2017
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BRYAN...LIBERTY AND
LONG COUNTIES...
At 550 PM EDT, National Weather Service doppler radar indicated
strong thunderstorms along a line extending from near Gum Branch to
near Riceboro, and moving northeast at 20 mph.
HAZARD...strong winds 45 to 55 mph and excessive cloud to ground
lightning.
IMPACT...Expect minor damage to tree limbs and blowing around of
light, unsecured objects. All outdoor activities should
cease. Move indoors immediately.
Some locations in the path of these storms include...
Hinesville, Richmond Hill, Fort Stewart, McIntosh, Walthourville,
Riceboro, Flemington and Allenhurst.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Excessive cloud to ground lightning is occurring with these storms.
Lightning can strike 15 miles away from a thunderstorm. Seek safe
shelter inside a building or vehicle.
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 3180 8177 3213 8157 3192 8127 3191 8126
3191 8125 3189 8124 3189 8123 3185 8117
3167 8146 3169 8146 3170 8149 3165 8152
TIME...MOT...LOC 2150Z 214DEG 16KT 3181 8166 3171 8151Special Weather Statement
National Weather Service Charleston SC
628 PM EDT SAT JUN 17 2017
GAZ101-115-116-118-138-172315-
Evans-Effingham-Inland Liberty-Inland Chatham-Inland Bryan-
628 PM EDT SAT JUN 17 2017
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BRYAN...EVANS...
LIBERTY...EFFINGHAM AND CHATHAM COUNTIES...
At 628 PM EDT, National Weather Service doppler radar indicated
strong thunderstorms along a line extending from near Pembroke to 8
miles south of Ellabell, and moving north at 20 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 these storms include...
Pooler, Pembroke, Lanier, Bloomingdale, Blitchton, Eden, Meldrim and
Ellabell.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 3211 8174 3221 8142 3211 8123 3185 8143
3204 8178 3204 8177 3205 8177
TIME...MOT...LOC 2228Z 195DEG 16KT 3208 8169 3200 8148The Charleston,SC radar (KCLX), 84 km away, was scanning. The volume nearest the first event began at 22:52 UTC.
1 thunderstorm wind. Local standard time, as filed.
Law enforcement reported multiple trees down on US 280 near Bacontown Road.
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, June 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: 697227.