Marine Weather and Tide Forecast for Port Royal, SC

NEAR TERM /THROUGH TONIGHT/
Compact short-wave/1.5 PV anomaly and attending closed surface low is just off the northern coast of west Florida with a low level boundary that extends E/SE across the Florida Peninsula.
Axis of low-mid level warm advection forcing and precip extends across northern Florida to off the southeast Georgia coast. Some peripheral light precip lingers across the local forecast area along with a narrow band of more persistent precip down across far southern Georgia.

Tonight: Aforementioned short-wave and surface low will track across the northern/central Florida Peninsula this evening and off the east coast overnight while strong surface high pressure folds down into the southeast region overnight into Tuesday.
Isolated peripheral light precip might linger across the local forecast area into early evening and the more persistent precip could yet skim the far southern parts of the CWA through early evening. But for the most part, measurable precip appears to be over with.

Meanwhile, drier air and clearing skies builds across the region later this evening and overnight. Temperatures will dip into the upper 20s to lower 30s inland to the middle and upper 30s along the coast.

SHORT TERM /TUESDAY THROUGH THURSDAY/
Tuesday through Thursday: Overall, the mid week time period look quiet but still cool. Aloft, zonal flow will prevail for the most part, with a trough expected to pass through Thursday. At the surface, high pressure will spread in on Tuesday and prevail through Wednesday, with an area of low pressure in the Gulf of Mexico passing by to the south on Thursday. The forecast is dry through the period, with the northern extent of the precipitation shield with the Thursday system in the Gulf staying displaced just to the south.
We should see plenty of sun on Tuesday followed by varying degrees of cloud cover Tuesday night through Thursday. Temps will continue the below normal trend we have seen so far in January, with the coolest day expected to be Wednesday with mid to upper 40s for southeast SC and low to mid 50s for southeast GA. Overnight lows are expected to be coldest Wednesday night with the potential for mid to upper 20s inland and low 30s along the immediate coast. Wednesday night and Thursday morning will bring the best chance for needing a Cold Weather Advisory during the period, though the potential is mostly limited to isolated locations across the inland tier.

LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/
Following high pressure on Friday, the most impactful portion of the forecast during the long term period appears to be the weekend.
There are significant timing differences among the suite of global models, so there is low confidence in the forecast details. The feature of interest is a cold front expected to approach from the west and produce some weak return flow across the region. This should bring temperatures up above normal by a few degrees with a passing frontal band of showers. The front and systems will shift offshore, ushering in another cool airmass with below normal temperatures for early next week.

AVIATION /20Z MONDAY THROUGH SATURDAY/
12Z TAFs: Low pressure will be tracking across the central Florida Peninsula through tonight. North of the low, isolated light precip will continue to impact the terminals through this afternoon before completely ending this evening.

Overall VFR conditions are anticipated at KCHS and KJZI this afternoon into tonight with cloud ceilings at or above 5K feet.
At KSAV, a period of MVFR ceilings is anticipated this afternoon into very early evening with conditions returning to VFR thereafter.

Clearing (solid VFR conditions) skies take shape across the local forecast area tonight.

Extended Aviation Outlook: VFR conditions are expected to prevail through the end of the week. A front is expected pass through the region this weekend, possibly bringing showers and brief periods of flight restrictions.

MARINE
The sfc pattern will support WNW winds across the marine zones between 5 to 10 kts today. Seas will remain between 1 to 2 ft.
Tonight, the pressure gradient should increase between a departing low to the south and high pressure over the Deep South. Northwest winds are forecast to gradually strengthen through the night, reaching 10 to 15 kts with gusts to 20 kts across the outer GA waters. Seas should gradually build to 1 to 2 ft across the nearshore waters and 3 ft across the outer GA waters.

Tuesday through Saturday: High pressure will mostly prevail across the region into late week with a dry cold front expected to pass through from the north on Wednesday. Northwest winds should prevail Tuesday into Wednesday, with a surge in flow Tuesday night into Wednesday. In fact, this surge could bring marginal Small Craft Advisory conditions to portions of the waters during this time. The next best chance of seeing advisory level winds and seas will come early in the weekend associated with a passing cold front.

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