FXUS62 KCHS 180221 AFDCHS
Area Forecast Discussion National Weather Service Charleston SC 1021 PM EDT Thu Apr 17 2025
.SYNOPSIS...
High pressure will remain the primary feature through the weekend and into early next week. A front could spread across our region by the middle of next week.
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.NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...
It's interesting one can still see evidence of the sea breeze on satellite late Thursday, running roughly from Aiken to Augusta, Swainsboro, and Hazelton. This meteorologist recalls once seeing the sea breeze, still shown on radar, pushing into northern Georgia well after midnight.
Recent trends support lowering some temperatures far inland, now down into the upper 40s or near 50F, such as Berkeley County, and the west and northwest counties. Higher dew points advecting off the ocean will limit lows to the mid and upper 50s further east, with even some places on the barrier islands, and parts of the Charleston and Savannah metros not dropping below the lower 60s.
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.SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY/...
The mid-levels will consist of a ridge building over the Southeast U.S. Friday into Saturday, causing heights to rise. This ridge is expected to prevail into Sunday. At the surface, High pressure will prevail in the Atlantic. The periphery of the High will bring our area dry conditions. Expect some fair weather cumulus Friday and Saturday afternoon, followed by increasing high clouds on Sunday. The combination of low-level thickness values and 850 mb temperatures will yield above normal high temperatures. They should range from the lower to middle 80s on Friday and the middle to upper 80s on Saturday and Sunday. Though, temperatures will be cooler at/near the beaches all three days due to a sea breeze. Low temperatures will range from the middle 50s far inland to the lower to middle 60s at/near the beaches Friday and Saturday night.
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.LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/...
Surface High pressure will prevail through early next week. It'll bring dry conditions with above normal temperatures. A front should approach on Tuesday, possibly stalling across our area Wednesday and Thursday. This will bring diurnally-driven showers and thunderstorms, enhanced by the afternoon sea breeze.
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.AVIATION /02Z FRIDAY THROUGH TUESDAY/...
VFR conditions will prevail at KCHS, KJZI, and KSAV through 00Z Saturday. Deep mixing and the passage of the sea breeze will allow for SE wind gusts of 20 or 25 kt at all terminals Friday afternoon.
Extended Aviation Outlook: VFR.
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.MARINE...
Rest of tonight: Very quiet conditions will continue across the local waters, as strengthening high pressure holds across the western Atlantic. Winds will be southeasterly at no more than 10 or perhaps 15 kt, with seas just 1 or 2 feet.
Extended Marine: High pressure will prevail in the Atlantic through the weekend and into early next week. This will yield SW surface winds. Expect higher winds near the coast and across Charleston Harbor with the afternoon sea breeze. A front may approach our area on Tuesday, but significant winds are not forecasted with it. Seas should average 2-3 ft within 20 nm and 3-4 ft for the GA waters beyond 20 nm. No marine headlines are expected.
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.CHS WATCHES/WARNINGS/ADVISORIES...
GA...None. SC...None. MARINE...None.
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NEAR TERM... SHORT TERM... LONG TERM... AVIATION... MARINE...