Charleston Harbor Marine Forecast
|Rest Of Today...Nw Winds 10 Kt.|
|Tonight...Nw Winds 5 Kt.|
|Sat...Ne Winds 5 Kt.|
|Sat Night...Ne Winds 5 Kt.|
|Sun...Ne Winds 5 Kt. A Slight Chance Of Showers.|
|Sun Night...N Winds 5 Kt. A Slight Chance Of Showers.|
|Mon...N Winds 5 To 10 Kt.|
|Mon Night...N Winds 5 To 10 Kt.|
|Tue...N Winds 5 To 10 Kt.|
|Tue Night...N Winds 5 To 10 Kt. Unless Otherwise Noted, Waves 1 Foot Or Less. Charleston Harbor Water Temperature 63 Degrees.|
|Area Forecast Discussion|
National Weather Service Charleston SC
954am EST Fri Nov 16 2018
Synopsis: Cool, dry high pressure will dominate the pattern through the weekend. Another cold front may move through the region by mid week, followed by stronger high pressure and continued cool conditions for the remainder of the work week.
Near Term - Through Tonight
Surface high pressure and deep layered dry air will expand over the area today, resulting in clear skies and cool temperatures. A small area of cirrus may drift into far western zones during the afternoon but will have little to no impact on temps. Highs will top out in the mid to upper 50s.
Tonight: The main concern under clear skies will be the setup for strong radiational cooling and temps falling into the mid 30s many areas along and west of U.S. 17. We expect to hoist frost advisories for many inland zones while we inspect the outcome of this morning's potential inland freeze for possible additional freeze warnings. We think coldest rural areas have a decent chance of seeing a light freeze north of I-16 in GA and along northwest zones of southeast SC.
Short Term - Saturday Through Monday
West-southwest upper level flow and weak surface high pressure will prevail over the region through the period with no significant precipitation expected.
Saturday: Temperatures will be the coolest for this period. After a very cold start, temperatures are expected to climb into the mid 60s by afternoon. Winds will be light as high pressure becomes centered over the mid Atlantic States. By Saturday night, the surface ridge will elongate and shift more into the Atlantic. However, low level light north-northeast winds will remain over the region, which should allow temperatures to drop to around 40 well inland, to the mid 40s to around 50 closer to the coast.
Sunday and Monday: Temperatures moderate as the center of the surface high moves farther offshore into the Atlantic. This allows a weak coastal trough to develop. Models indicate some moisture return and therefore slight chance/low end chance for light showers, mainly near the coast, later Sunday through early Monday. The coastal trough weakens/moves offshore Monday as weak surface high pressure tries to build back from the west. High temperatures generally in the upper 60s to around 70, and lows Sunday night in the lower 40s well inland to the lower 50s closer to the coast
Long Term - Monday Night Through Thursday
A broad upper trough moves across the OH River Valley Tuesday and then across New England/southeast Canada Wednesday. At the surface, stronger/cooler high pressure builds from the northwest behind a cold front, which moves through with little/no precip. later Tuesday. The surface ridge remains north of the region Wednesday and Thursday, then shifts east/offshore of the mid Atlantic by Friday. The Global models show a return of deep layer moisture from south to north by Friday as the low level flow veers to southeast. Given the uncertainty out that far, have kept low end chance PoPs, which also seems to collaborate well with surrounding office. High temperatures starting off in the mid to upper 60s Tuesday, then cooler for Wednesday and Thursday behind the cold front, with highs generally in the lower 60s. By Friday, temperatures moderate into the upper 60s. Low temperatures will be cool, ranging from the low 40s well inland to around 50 closer to the coast.
Wind/seas will continue to diminish today as high pressure builds in from the west. From this afternoon through tonight, wind speeds will be much lighter as the mean flow veers from NW to N and NE by early Saturday. Seas will subside to less than 3 ft near shore and 3-4 ft out near the Gulf Stream.
No highligheights are expected through the period. Weak high pressure is expected to remain just north of the waters through Sunday. As the high shifts eastward later Sunday, a weak coastal trough tries to develop, which may bring a chance for showers Sunday night and early Monday. Another cold front likely pushes through the waters later Tuesday. Winds generally 15 knots or less and seas 2 to 4 feet through Tuesday. Winds increasing to around 15 knots behind the front later Tuesday through Wednesday. Some gusts near 20 knots will be possible Tuesday night and Wednesday
NOAA Charleston SC Office: Watches - Warnings - Advisories
GA...None. SC...None. MARINE...None