Area Forecast Discussion
Issued by NWS Wilmington, NC

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785 FXUS62 KILM 270736 AFDILM Area Forecast Discussion National Weather Service Wilmington NC 336 AM EDT Tue Sep 27 2016 .SYNOPSIS... A weak wave of low pressure moving just offshore will bring showers today, mainly along the coast. A cold front approaching from the west will stall through mid-week before moving across the area on Thursday, maintaining warm and unsettled conditions. Cool and dry high pressure will build into the area by the weekend. && .NEAR TERM /THROUGH TONIGHT/... As of 1030 PM Monday...It looks like the the warm front has passed just to the north of the forecast area. Some light showers are approaching the coast as a coastal trough forms. This is as forecast. Previous discussion follows: The stationary front that was located just to the south of the forecast area is slowly moving northward as the observations at Kingstree and Georgetown are now reporting a more northeast and east flow with increased dewpoint seen at Kingstree. The water vapor imagery also is indicting the mid and upper moisture has begun it shift northward. Scattered convection has developed along a boundary from Longs, SC to Kingstree. So will continue with a slight chance of POPs from SC this evening. The models continue to show the development of a coastal trough with a low pressure area forming and moving up the coast just offshore on late tonight. So with this low pressure area will increase precipitation chances to ~30-40% along the coast and a 20% chance inland. && .SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/... As of 3 PM Monday...The short term forecast period will be marked with a cold front sliding into the forecast area and then stalling. This front will be a focal point for showers and isolated thunderstorms each day. On the synoptic scale a large upper-level low just north of Lake Superior will shift to Ohio Valley by Wednesday night. This feature will be bringing a significant air mass change but this does not begin until after the short term forecast period. The slow moving cold front will be the focus for the heaviest rain on Wednesday into Wedensday night with QPF values running between just over 1". Maximum Temperatures on Tuesday and Wednesday are expected to rise to the middle 80s with the warmer temperatures west of Interstate 95. For lower temperatures values will range from the upper 60s inland to the lower 70s at the coast. && .LONG TERM /FRIDAY THROUGH MONDAY/... As of 300 AM Tuesday...The extended remains a rather lower than average confidence forecast due to discrepancies in the guidance handling an anomalous cut-off low across the OH VLY. The ECM continues to be a slow outlier, but once again the GFS/CMC, which are in very good agreement today, have slowed from previous solutions. This continues to lend some support to the ECM, and a slower progression of the mid-level and surface features is likely, just not quite to the extent the ECM continues to advertise. While this upper low spins and ejects only very slowly NE through the wknd, the surface cold front beneath it will drift east, crossing the local area late Thursday, before being replaced by Canadian high pressure. This suggests that cooler and drier conditions will be in place for the majority of the extended, with temps at or slightly below seasonable norms, and a nice early fall weekend is possible. Must continue to note however that if the ECM ends up correct, this front may not cross until Saturday, leaving much warmer and unsettled conditions in place through the first half of the wknd. && .AVIATION /08Z TUESDAY THROUGH SATURDAY/... As of 06Z...Slow moving cold front well NW of the terminals, and a developing weak low pressure along the coast, will maintain ample cloudiness and possible showers through the valid period. A few showers have developed along the coast so far this morning, and this is likely to continue through daybreak. Do not expect coverage to be widespread enough for a VCSH mention, so have added a TEMPO group at ILM/CRE/MYR for periodic and brief MVFR. The inland terminals will likely remain dry as the showers along the cold front to the NW are forecast to dissipate as they drop SE. While cloud cover will be significant, much of it will remain the mid-levels, so light fog is possible overnight at LBT/FLO, with winds just above the surface likely too strong for any IFR vsby restrictions. Scattered showers will again be possible during Tuesday aftn/eve, but coverage is expected to be light enough that no mention of any restrictions has been added attm. Best chance for showers during the day will be along the coast, but will handle this potential with later updates. Winds will be generally from the east and less than 10 kts beneath VFR cigs. More stratus will again be possible Tuesday night, especially along the coast. EXTENDED OUTLOOK...Scattered SHRA/TSRA Tuesday through Thursday. Cold frontal passage Thursday. VFR expected fRI/SAT. && .MARINE... NEAR TERM /THROUGH TONIGHT/... As of 1030PM Monday...Latest obs continue to show easterly winds of 10 to 15 kts with seas of right around 3 ft. This fits in well with the going forecast. No changes made with latest update. Previous discussion follows: A stationary front is located near the Georgetown coastal waters and is expected to shift northward overnight. To the south a coastal trough will develop with a low pressure area moving to the southern coastal waters by daybreak. Winds will mainly be from the east overnight at 10 to 15 knots with seas ranging between 2 to 4 feet. A 1 to 2 foot easterly swell is also expected to continue through the period. SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/... As of 3 PM Monday...As a coastal low shifts northward along the coast, a slow moving cold front will stall before shifting off the coast late wednesday night. winds are expected to shift to the southwest tuesday night but winds speeds are expected to be 10-15 knots. seas will continue to run between 2 and 4 feet. Showers and thunderstorms are possible throughout most of this period. LONG TERM/FRIDAY THROUGH SATURDAY/... As of 300 AM Tuesday...A cold front will slowly move across the waters on Friday, causing winds to shift from SW at 5-10 kts early, to NW at 5-10 kts late. As high pressure builds down into the area behind this front on Saturday, winds will shift further to the NE, but remain at relatively weak speeds due to the weak pressure gradient. Seas will be 2-3 ft Friday with a southerly 5-6 sec wave being the predominant wave group. By Saturday, wave heights will fall to around 2 ft, possibly building again late in the period as some forerunner swell from a developing tropical system well out in the Atlantic enters the waters. && .ILM WATCHES/WARNINGS/ADVISORIES... SC...None. NC...None. MARINE...None. && $$ SYNOPSIS...JDW NEAR TERM...DCH/REK/DRH SHORT TERM...DCH/DRH LONG TERM...JDW AVIATION...JDW MARINE...DCH/REK/JDW/DRH

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