A weak mid level disturbance along with modest instability and shear led to the development of thunderstorms capable of producing damaging wind gusts across 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 weak mid level disturbance along with modest instability and shear led to the development of thunderstorms capable of producing damaging wind gusts across 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 24, 6:30 PM EST, 39 minutes earlier.
Area Forecast Discussion National Weather Service Charleston SC 730 PM EDT Wed Jun 24 2020 .SYNOPSIS... A trough of low pressure will exist over or near the area into early next week. A cold front could approach by the middle of next week. && .NEAR TERM /UNTIL 6 AM THURSDAY MORNING/... Through the afternoon, the showers/thunderstorms have mainly remained in the SC Tri-County and over the SC nearshore waters. On radar, quite a few scattered showers/thunderstorms have begun to form in SE GA and the SC Lowcountry. For the update, slightly adjusted POPs but kept chance of showers/thunderstorms through later this evening. CAPE values remain around 1500-2000 J/kg and DCAPE seems to max out around 800 J/kg. Marginally severe thunderstorms are possible with the main threat being damaging wind gusts. Most of the convection should be offshore late tonight with lingering showers possible. As of now, no other major adjustments were made but depending on the coverage of showers, tonight's temperatures might need to be lowered a degree or two. && .SHORT TERM /6 AM THURSDAY MORNING THROUGH SATURDAY/... Thursday: The large scale pattern aloft will feature a deep westerly flow situated between a broad trough to our north, and a flat but extensive anticyclone centered over Florida and the northwest Bahamas. At the surface we find the Atlantic ridge suppressed across Florida, while a trough exists over the region and aligned from north-northeast to the south-southwest. This trough and the sea breeze will aid in the formation of convection, but additional upstream activity could also arrive as weak mid level disturbances move through. The combination of MUCAPE reaching 1500-2500 J/kg and 35-45 kt westerly mid level flow in place, some of the storms could organize into multicell clusters and/or lines, leading to a potentially of locally damaging wind gusts. Since there is such as large discrepancy between the various model guidance, we opted to go with scattered convection, but higher PoP might be warranted at a later time. An interesting aspect to the forecast on Thursday is that the Saharan dust and haze that is impacting parts of the Gulf of Mexico could reach into our forecast area. Depending upon how low visibilities do get, we may need to include in the forecast at a later time. It could also have an impact on temps, so we trended toward the lower MOS guidance, showing max temps mainly in the mid 80s to lower 90s. Friday and Saturday: The mid and upper level ridge will gradually build over the area, leading to 500 mb heights reaching as high as 5900-5920 meters. The resulting large scale subsidence, plus warm and dry mid level air will limit how much convection can develop. So we don't have anything higher than 20% chances both days. Given a deep offshore flow and 850 mb temps as high as 18-19C, max temps should easily reach the lower or middle 90s. However, the low level thickness scheme would support temps even hotter. For the time being there looks to be enough mixing out of dew points to prevent any Heat Advisories from being required. && .LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/... A more active pattern will develop late weekend through early next week as the upper ridge gives way to a broad trough and an increasing number of shortwaves move through. Tuesday and Wednesday look particularly active due to a front dropping into the area. && .AVIATION /00Z THURSDAY THROUGH MONDAY/... Various boundary interactions along with considerable moisture and modest instability will allow for at least scattered showers and tstms around the area early tonight. As a result, temporary flight restrictions are anticipated at both KCHS and KSAV from 01 to 03Z. VFR will then prevail the balance of the night and into Thursday. There is still too much uncertainty regarding the timing and coverage of convection Thursday afternoon and evening, so we haven't included any mention of SHRA or TSRA at this time. Additionally, there is some chance that African dust/haze could produce MVFR visibilities on Thursday. However, the potential is too low to have with the 00Z TAF set. Extended Aviation Outlook: Mostly VFR, although brief flight restrictions can occur during afternoon/evening showers and tstms Thursday, Sunday, and Monday. && .MARINE... Tonight: A line of thunderstorms is expected to move across the waters this evening. A few storms could produce gusty winds, possibly reaching Special Marine Warning criteria, especially for the nearshore waters. Otherwise, expect SW winds 10-15 kt the first half of the night, easing to around 10 kt the second half of the night. Seas will be in the 2-4 ft range. Thursday through Monday will feature a fairly typical summertime pattern, as Atlantic high pressure remains to the S and SE, while an inland trough prevails to the N and NW. The gradient does not look terribly strong any given day, so winds and seas outside of any showers and t-storms will be far below advisory thresholds. The strongest winds (up to about 15 kt) will be in the afternoon along the Charleston coast due to a diurnal sea breeze, and during the overnight hours most waters due to nocturnal surges. Rip Currents: Although we are forecasting a Low Risk of rip currents at the beaches both Thursday and Friday, given that there will be a small swell impacting the surf zone, we might need to raise either or both days to a Moderate Risk at a later time. && .CHS WATCHES/WARNINGS/ADVISORIES... GA...None. SC...None. MARINE...None. && NEAR TERM... SHORT TERM... LONG TERM...JRL AVIATION... MARINE...
Hazardous Weather Outlook National Weather Service Charleston SC 356 PM EDT Wed Jun 24 2020 AMZ330-350-352-354-374-GAZ087-088-099>101-114>119-137>141-SCZ040- 042>045-047>052-252000- 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 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- 356 PM EDT Wed Jun 24 2020 This Hazardous Weather Outlook is for Atlantic coastal waters, southeast Georgia and southeast South Carolina. .DAY ONE...This afternoon and tonight. Severe Weather: A line of thunderstorms is expected to move across the area this evening. Some of these storms could generate damaging winds. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. There is a low probability for widespread hazardous weather. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time.
Special Weather Statement
National Weather Service Charleston SC
242 PM EDT Wed Jun 24 2020
SCZ045-241930-
Inland Berkeley-
242 PM EDT Wed Jun 24 2020
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BERKELEY COUNTY...
...MARINERS ON LAKE MOULTRIE SHOULD SEEK SAFE HARBOR...
At 241 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorm over Southern Lake Moultrie, or near Moncks
Corner, moving east 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, Saint Stephen, Bonneau, Southern Lake Moultrie,
Northern Lake Moultrie, Bonneau Beach, Old Santee Canal State Park
and Pinopolis.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Boaters on Lake Moultrie should seek safe harbor immediately. If
caught on the open water, stay as low as possible and wear a personal
flotation device. Remember, if you can hear thunder you are at risk
for being struck by lightning.
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 3340 7985 3338 7981 3337 7980 3338 7979
3337 7978 3332 7974 3320 7979 3318 7990
3319 8016 3340 8014 3343 7988
TIME...MOT...LOC 1841Z 273DEG 12KT 3328 8007
DPBSpecial Weather Statement
National Weather Service Charleston SC
331 PM EDT Wed Jun 24 2020
SCZ045-242015-
Inland Berkeley-
331 PM EDT Wed Jun 24 2020
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BERKELEY COUNTY...
At 331 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorm 8 miles southwest of Jamestown, or 10 miles east
of Moncks Corner, moving east at 20 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...
Bonneau and Jamestown.
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 3332 7974 3332 7970 3330 7966 3327 7956
3324 7950 3325 7948 3321 7945 3321 7947
3319 7949 3314 7952 3316 7956 3313 7964
3310 7966 3314 7991 3332 7995 3336 7978
TIME...MOT...LOC 1931Z 272DEG 19KT 3323 7982
DPBPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
349 PM EDT WED JUN 24 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0811 PM TSTM WND DMG 1 SSE BLUFFTON 32.22N 80.86W
06/23/2020 BEAUFORT SC EMERGENCY MNGR
A TREE WAS REPORTED DOWN ON ALLJOY ROAD AT CONFEDERATE
AVENUE.
&&
EVENT NUMBER CHS2000455Special Weather Statement
National Weather Service Charleston SC
402 PM EDT Wed Jun 24 2020
SCZ050-242045-
Charleston-
402 PM EDT Wed Jun 24 2020
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF CHARLESTON COUNTY...
At 401 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorm 9 miles south of Jamestown, or 10 miles northwest
of McClellanville, moving east at 20 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...
McClellanville, Awendaw, Hampton Plantation State Park, Cape Island,
Lighthouse Island, Cape Romain and Santee Coastal Reserve.
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 3307 7931 3299 7935 3298 7952 3300 7960
3305 7970 3313 7964 3313 7960 3316 7956
3314 7952 3319 7949 3322 7944 3316 7937
3314 7928 3311 7927
TIME...MOT...LOC 2001Z 285DEG 21KT 3316 7963
DPBSpecial Weather Statement
National Weather Service Charleston SC
445 PM EDT Wed Jun 24 2020
SCZ050-242115-
Charleston-
445 PM EDT Wed Jun 24 2020
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF CHARLESTON COUNTY...
At 443 PM EDT, National Weather Service doppler radar indicated
strong thunderstorms along a line extending from 6 miles southwest of
Yawkey South Island to near Lighthouse Island to Garris Landing, and
moving southeast at 20 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 these storms include...
McClellanville, Awendaw, Garris Landing, Cape Island, Bull Island,
Lighthouse Island, Cape Romain and Santee Coastal Reserve.
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.
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 3310 7927 3307 7931 3299 7933 3298 7951
3289 7955 3287 7958 3289 7966 3298 7972
3306 7958 3308 7952 3319 7941 3316 7935
3314 7927
TIME...MOT...LOC 2043Z 304DEG 24KT 3311 7925 3298 7945 3294 7964
DPBSpecial Weather Statement
National Weather Service Charleston SC
739 PM EDT Wed Jun 24 2020
SCZ040-042-250015-
Allendale-Hampton-
739 PM EDT Wed Jun 24 2020
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF HAMPTON AND ALLENDALE
COUNTIES...
At 738 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorm over Allendale, moving east at 30 mph.
HAZARD...strong winds 45 to 55 mph.
IMPACT...Expect minor damage to tree limbs and blowing around of
light, unsecured objects.
Some locations in the path of this storm include...
Allendale, Fairfax, Brunson, Gifford, Sycamore, Ulmer, Crocketville
and Seigling.
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 3305 8113 3304 8109 3295 8101 3294 8102
3283 8126 3299 8149 3311 8134 3311 8129
3312 8124 3312 8120
TIME...MOT...LOC 2338Z 286DEG 31KT 3302 8128
DPBThe Charleston,SC radar (KCLX), 61 km away, was scanning. The volume nearest the first event began at 00:08 UTC.
1 thunderstorm wind. Local standard time, as filed.
The Screven County 911 Call Center reported a tree down near the intersection of Bascom Road and Lawton Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Georgia in 2020Every state in 2020This day in weather historyWarnings in Georgia, June 2020
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: 901007.