Area Forecast Discussion
Issued by NWS Wilmington, NC

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000 FXUS62 KILM 192330 AFDILM Area Forecast Discussion National Weather Service Wilmington NC 730 PM EDT Thu Oct 19 2017 .SYNOPSIS... Mostly clear skies and a warming trend are expected into the weekend, as a dry upper ridge builds across the region. An approaching cold front will bring a few showers on Tuesday, before moving offshore Wednesday. && .NEAR TERM /THROUGH FRIDAY/... As of 3 PM Thursday...High pressure consolidating over eastern TN today will gradually shift east-northeast Fri, slowly weakening as it shifts. Weak shortwave aloft exiting to the east this afternoon will be replaced by mid-level ridge later tonight and Friday. Northerly winds become light and variable overnight and remain light and variable tomorrow with a very weak gradient in place. Deep dry air and light to calm winds overnight will lead to strong radiational cooling with inland cold spots dipping well into the 40s. Along the coast lows will be around 50. Very dry air lingers in the region Fri with precipitable water peaking around 0.50 inch in the afternoon. Highs on Fri will end up a few degrees warmer than today, mainly due to building heights/thickness and further air mass modification. Flow remains northerly through just about the entire column so there is no real warm advection to speak of. Relaxed gradient will allow for development of weak afternoon sea breeze which may temper highs along the coast but do not expect any cloud development. && .SHORT TERM /FRIDAY NIGHT THROUGH SATURDAY NIGHT/... As of 3 PM Thursday...Mid to upper ridge up the southeast coast and surface high pressure to our north will both shift east through the period. Overall a very light NE flow will veer around becoming more easterly through the period. This will allow for an increase in low level moisture basically late Sat into Sat night. This should bring some low clouds mainly over northeast SC or some fog elsewhere, mainly near the coast. Dewpoint temps will increase from near 50 to 55 Fri night to 55 to around 60 by daybreak Sun. The strong subsidence inversion will slowly erode through the period but not enough to allow for any pcp or for that matter much in the way of cloud. The dry air in place will allow for a large diurnal swing, but slightly dampened Sat night with an increase low level moisture. Overall mainly clear skies and very light winds leading to decent radiational cooling. Overnight lows will be 50 to 55 Fri night and 55 to 60 Sat night most places while bright Oct sunshine will bring temps up close to 80 Sat aftn. && .LONG TERM /SUNDAY THROUGH THURSDAY/... As of 3 PM Thursday...the upper level pattern continues to show high pressure breaking down and a large scale trough moving to the eastern half of the United States by Tuesday. This is slower than the previous run. At the surface the frontal boundary is slower with the GFS bringing the frontal boundary into the area Tuesday night. The ECMWF is even slower with the boundary pushing off the coast Wednesday morning. Precipiation chances start late Sunday night with isolated showers then chances increase to likely on Tuesday with the frontal passage. High temperatures will be around 80 degrees on Sunday and Monday but with the frontal passage will see temperatures falling into the upper 60s to middle 60s by Wednesday and Thursday. Lows on Sunday night will be in the lower to middle 60s but will fall into the middle to upper 40s by Wednesday night. && .AVIATION /00Z FRIDAY THROUGH TUESDAY/... As of 23Z...Will continue with the high confidence of VFR through 20/23Z. Clouds will be few through this TAF valid period. Light and Variable to calm winds overnight will become N-NE winds at 5-10 kts expected Friday afternoon. After 10Z, with clear skies and light winds conditions will be favorable for possible fog development. Moisture is very limited and will just indicate MVFR vsbys for now. Extended Outlook...Tempo MVFR/showers Mon/Tues. Otherwise VFR. && .MARINE... NEAR TERM /THROUGH TONIGHT/... As of 3 PM Thursday...High pressure over eastern TN this afternoon into tonight will shift east-northeast Fri. Gradient over the waters continues to relax tonight with speeds dropping under 10 kt by midnight. Flow remains north to northeast through the period but gradient remains weak tomorrow with speeds 10 kt or less. Winds may veer to east or even southeast later in the day in response to development of weak sea breeze. Seas 3 to 4 ft, with 2 ft near shore, this afternoon will drop to 2 to 3 ft overnight. On Fri 2 ft will be the dominant condition with occasional 3 ft possible. SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/... As of 3 PM...High pressure to our north will shift east through the period. Overall a very light NE flow will veer around becoming more easterly through the period, remaining less than 15 kts. Expect a slight chop Sat aftn as winds spike up and become more on shore, but overall benign seas expected mainly around 3 ft or less. LONG TERM /SATURDAY THROUGH MONDAY/... As of 3 PM Thursday...High pressure over the waters will weaken and shift offshore. This will allow for veering of the winds with a southerly wind by Monday. Seas will be 2 to 3 feet on Sunday and will slowly increase by late Monday to 3 to 4 feet as the winds slowly increase ahead of front that will approach the waters late Tuesday. && .ILM WATCHES/WARNINGS/ADVISORIES... SC...None. NC...None. MARINE...None. && $$ SYNOPSIS... NEAR TERM...III SHORT TERM...RGZ LONG TERM...DRH AVIATION...MAC MARINE...

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