Marine Weather and Tide Forecast for Port Royal, SC

NEAR TERM /THROUGH TONIGHT/
Deep-layered high pressure will remain across the Southeast U.S.
tonight. The boundary layer will decouple later this evening once the sea breeze circulation breaks down. High clouds will be on the increase through the night. The cooler side of guidance was still preferred given guidance has been running a tad too warm for the past few nights. Similar to this morning, some shallow ground fog could develop away from the coast just before daybreak. No major impacts are expected. Lows will range from the mid-upper 50s inland to the upper 60s at the beaches.

SHORT TERM /SUNDAY THROUGH MONDAY/
The center of a H5 590DM ridge will slowly drift from the FL/GA line on Sunday to over the Bahamas Islands by Tuesday. At the sfc, high pressure centered over the western Atlantic will continue to ridge across the region through the short term period. This pattern will keep the forecast dry under deep dry air with a strong subsidence inversion each day. High temperatures are forecast to generally range between 85 to 90 degrees each afternoon away from the coast. Coastal temperatures along the beaches expected to peak around 80 degrees. The warmest day is expected on Tuesday as a cold front remains just north and west of the region. Low temperatures are forecast to favor values from around 60 inland to the mid 60s along the coast.

LONG TERM /MONDAY NIGHT THROUGH FRIDAY/
Long term guidance indicates that a cold front will approach the region Tuesday night, possibly becoming stationary over or near the region Wednesday into Wednesday night. PW values are forecast to increase to around 1.5 inches Wednesday afternoon.
As a sea breeze develops on Wednesday, convection should develop between the sea breeze and the stationary front. The potential for showers and thunderstorms will be highlighted with SCHC to CHC PoPs Wed afternoon and evening. A similar process may generally replay on Thursday, with the greatest coverage shifting inland. Friday into Saturday, an area of low pressure is forecast to organize over the Arklatex region, tracking to the NE. The stationary front across the region may drift north or dissipate. Less than SCHC PoPs expected across the region headed into the weekend. Temperatures through the period should remain above normal through the period. High temperatures should generally range in the mid to upper 80s with lows in the low to mid 60s.

AVIATION /18Z SATURDAY THROUGH THURSDAY/
19/18z TAF Discussion: KCHS/KJZI/KSAV: VFR through 18z Sunday. There could be some shallow ground fog at KSAV which may produce brief periods of MVFR vsbys, but increasing high clouds should prevent this from becoming too much of an issue.

Extended Aviation Outlook: Gusty winds are possible each afternoon at all terminals with the passage of the sea breeze.
There are no other concerns.

MARINE
Tonight: Sea breeze influences will diminish in the Charleston Harbor and along the land/sea interface later this evening. A southerly flow regime will remain in place tonight as Bermuda high pressure noses in from the east. Winds will average around 10 kt with seas 2-4 ft.

Sunday through Thursday: The weather pattern will generally yield south winds around 10 kts each days. Winds may remain a bit stronger close to the coast each afternoon following the sea breeze. Seas should average 2-3 ft within 20 nm and around 3 ft for the GA waters beyond 20 nm. No marine headlines are expected.

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