Marine Weather and Tide Forecast for McClellanville, SC

UPDATE
No big changes necessary from the previous forecast with this update.

NEAR TERM /THROUGH MONDAY/
Vague high pressure will linger offshore through tonight with low pressure to our north, its cold front to our northwest. The increase in the pressure gradient will lead to an overnight breeze that should keep fog and substantial radiational cooling at bay. Lows near 60 and in the lower 60s near the coast. Winds will turn to the west as the front approaches Monday morning. The front should start to move into the area during the afternoon and end up offshore by the end of the period. Winds will become more out of the northwest and increase to 10-15 mph. Highs inland will be near 80 with temperatures near the coast more in the lower to mid 80s.

SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY/
Deep troughing and or cold air advection remains the theme for the short term period. A seemingly preliminary surge of cooler air will be moving in late Monday and Tuesday as a front moves well offshore. A second shortwave embedded in the main developing trough brings a stronger surge of cold air late Tuesday into Wednesday. The GFS still likes some sprinkles or shower activity with the potent vorticity max but other global guidance isn't convinced. Highs Tuesday will be around 70 with lower 60s Wednesday. Expect a similar trend with lows dropping to around 40 Thursday.

LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/
Highly amplified pattern not uncommon for mid October will be in place keeping surface high pressure anchored south to north across the Appalachians. Can't find any impetus whatsoever for meaningful pops and even the cloud cover over the waters...once again typical in the scenario seems a challenge. The airmass will modify in time with highs reaching the middle 70s and lows in the lower to middle 50s by the end of the period.

AVIATION /01Z MONDAY THROUGH FRIDAY/
VFR through the 00Z TAF period with dry weather and mainly SKC continuing. Very dry moisture profile continues tonight precluding any fog formation. 10-12 kt winds will gradually veer through the day Monday as a cold front moves through. Low chance for low-level wind shear possible early Monday as flow aloft strengthens ahead of the front.

Extended Outlook...VFR continues for the remainder of the week as sfc high pressure builds in.

MARINE
Through Monday...
SW winds increase through the latter part of the day as the pressure gradient increases ahead of a cold front. This should bring a brief bout of Small Craft Advisory conditions over the SE NC coastal waters. The cold front will move offshore later in the day on Monday with winds becoming more N/NW at ~15 kts.

Monday Night through Friday...
Mainly north to northeast winds through the period as massive high pressure persists inland. Speeds will be highest with the strongest cold air advection of course occurring Wednesday into Thursday. During this time speeds may wobble just above the 15-20 knot range but for the most part reside in this area.
Significant seas will be 2-4 perhaps 2-5 feet (during the highest winds) throughout.

ILM WATCHES/WARNINGS/ADVISORIES
NC...None.
SC...None.
MARINE...Small Craft Advisory from 3 AM to 1 PM EDT Monday for AMZ250- 252.