Marine Weather and Tide Forecast for Sullivan's Island, SC

NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/
Late this evening: The overnight period will remain quiet with high pressure to the east persisting as the primary feature. The onshore flow will take on more of a southerly component with time, with most places either going calm or having light winds.
Lows are forecast to fall into the mid to upper 50s away from the immediate coast, with low to mid 60s as you get closer to the beaches. There are some hints in the guidance that there could be a bit of shallow fog inland right around sunrise, but no significant visibility reductions are expected.

SHORT TERM /6 AM WEDNESDAY MORNING THROUGH FRIDAY/
Sharp subtropical ridge axis will align across the southeast CONUS for the midweek period before phasing northern and southern stream short-waves begin to carve out deeper troughing across the eastern CONUS late week and into the weekend. Surface high pressure slowly migrates southward along the mid Atlantic and southeast coasts through Thursday which will maintain rain- free conditions for the local forecast area. By late week...upper level height falls begin to spread into the region as upper level troughing begins to develop and an attending surface boundary begins to press into the southeast. Guidance has trended slower with the overall pattern and resulting precip chances...with dry weather holding through at least the day Friday.

Highs will largely warm to the middle to upper 80s through the period with lows largely spanning the 50s, warmer at the beaches.

LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/
As mentioned, larger scale troughing continues to develop across the eastern CONUS heading into the weekend while associated surface cold front slowly advances through the region during the Saturday-Sunday timeframe. Again, a slower idea vs previous forecasts, with the better rain chances now looking to be on Saturday into Saturday night...pending later timing adjustments. A few thunderstorms are possible, but severe weather does not appear favorable at this time.

Late weekend into early next week: Strong high pressure develops across a good portion of the eastern CONUS, driving the boundary southward out of the area. This brings a bit of a cool down late in the forecast period, knocking temperatures back to around normal for early May.

AVIATION /02Z WEDNESDAY THROUGH SUNDAY/
VFR conditions will prevail at KCHS, KJZI, and KSAV through 00z Thursday.

Extended Aviation Outlook: Largely VFR. Showers and a few thunderstorms are possible Friday into Saturday and might lead to brief flight restrictions during that time.

MARINE
Tonight: Large Atlantic high pressure covers the local waters, with the associated ridge axis over or just south of the area.
This allows for mainly SE or S winds at or below 10 or 15 kt.
Seas are a mix of swells and wind driven waves, with the resulting significant wave heights just 2-4 feet (highest on the outer Georgia waters).

Wednesday through Sunday: High pressure will prevail through Friday leading to persistent southerly winds across the coastal waters. Cold front edges into the region late Friday and slowly progresses through the local forecast area during the weekend.
Conditions will remain below advisory criteria through Saturday.
However, winds will veer into the north/northeast late in the weekend and could result in marginal Small Craft Advisory wind gusts and seas.

CHS WATCHES/WARNINGS/ADVISORIES
GA...None.
SC...None.
MARINE...None.