283 FXUS62 KMHX 181906 AFDMHXArea Forecast Discussion National Weather Service Newport/Morehead City NC 306 PM EDT Thu Sep 18 2025
.SYNOPSIS... A cold front will move through the area on Saturday and stall offshore. A coastal trough or coastal low may then develop along the stalled front early next week.
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.NEAR TERM /THROUGH TONIGHT/... As of 230 PM Thursday...Low stratus lingers over portions of ENC this afternoon, expected to slowly clear SW to NE through the rest of today. Weakness in local pressure gradient leads to light and variable winds with the Crystal Coast seabreeze circulation the dominant wind feature. MaxTs low 80s SWern inland zones, mid to upper 70s beaches and NEern zones thanks to increased cloud cover.
Tonight will bring calming winds and clearing skies. Low level moisture advected in off the Atlantic by the afternoon`s seabreeze will open door for fog development due to the rad cooling and calm winds. Expect fog to show up first along the HWY17 corridor and then expand through the overnight. MinTs in low to mid 60s most, upper 60s to low 70s beaches. Fog could be dense at times, impacting the early morning commute Friday.
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.SHORT TERM /FRIDAY/... As of 245 PM Thursday...Fog inland to start the day, scouring out mid morning. Another day with light winds eventually coming out of the east and some high clouds overhead. Mostly clear skies should allow it to get pretty warm for all locales, highs in the upper 80s inland and low 80s for beaches.
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.LONG TERM /FRIDAY NIGHT THROUGH THURSDAY/... As of 200 AM Thursday...
Key Messages
- Warmer weather pattern to close out the work week
- Unsettled weather potentially returns late in the weekend or next week
Weak upper level troughing is forecast to reside over the Southern Appalachians through Saturday, then get kicked out to the east on Sunday as a more substantial trough develops over the central U.S. Multiple shortwaves are then forecast to eject out of that trough and move across the Southeast U.S. next week. Guidance is in very good agreement through this weekend, then begins to show substantial differences next week.
At the surface, high pressure overhead on Friday will shift east by Saturday as a more notable high builds in across New England. Meanwhile, low pressure is forecast to develop offshore well to the south of ENC by this weekend. The tightening gradient between the high to the north and the low to the south will setup a modestly strong northeasterly flow regime once again across the Carolinas. Within this regime, temperatures are expected to take a brief drop back down after the very warm temperatures on Friday.
Late in the weekend and into early next week, guidance continues to suggest the potential for low pressure to the south to shift north in the general direction of ENC. While the signal for a coastal low is still present in the latest guidance, there has been a notably weaker trend seen. The pattern still bears watching, but for now at least, the trend has been towards a weaker low to move through. In fact, it may be more of an inland-advancing coastal trough vs a weak coastal low. Either way, an increase in moisture and instability overlapped with the trough or low should support a modest increase in the chance of showers and thunderstorms, especially along the coast.
Towards the middle of next week, medium range guidance differs substantially. The point of contention appears to be focused around the development, and evolution, of a cutoff low east of the Great Plains. This type of pattern typically carries lower predictability at longer ranges. For now, then, a blended guidance approach suggests warming temperatures and a continued potential for unsettled weather.
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.AVIATION /19Z THURSDAY THROUGH TUESDAY/... SHORT TERM /through Friday morning/... As of 250 PM Thursday...MVFR ceilings continue where low stratus deck lingers, with VFR conditions elsewhere as sct/bkn stratocu lifts above 3kft. Tonight skies clear up and winds become calm, leading to a fog threat for all terminals away from the immediate coast. Expect vis to start dropping around or shortly after midnight in Onslow and Duplin Cos, before spreading north and east to much of ENC. Widespread MVFR to IFR visibility restrictions are expected tonight into the early morning hours Friday. Fog around and shortly after sunrise could be locally dense at times, resulting in visibilities of 1/4SM or less. Trended more aggressively with TAFs for the afternoon update, but there is room to go more aggressive with this evening`s update should the current trend of guidance hold.
LONG TERM /Friday afternoon through Tuesday/... As of 3 PM Thursday...Sub-VFR fog is possible Friday morning and Friday night into Saturday morning due to light winds and mostly clear skies. Signal for fog Saturday morning looks to be higher than that of Friday morning. During the afternoon and evening hours Friday and Saturday, VFR conditions are expected to prevail. The risk of sub VFR conditions may then gradually increase Sunday into early next week as a coastal trough or weak coastal low offshore migrates towards the coast with better moisture, lift, and instability. This setup also carries a risk of scattered SHRA and possibly a few TSRA (especially for coastal areas).
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.MARINE... SHORT TERM /through Friday/... As of 3 PM Thursday...Light and variable winds tonight across the board. As a result, seas continue to lay down through the period with buoy obs currently showing 1-3ft out of the E @ 9-10sec with minimal wind chop mixed in over the top. Swell continues to weaken tonight with seas becoming 1-2ft with 3 ft near the Gulf Stream by sunset and continuing to ease through the overnight. Friday, benign marine conditions continue, with light winds, waves 1-3 ft, and clear skies.
LONG TERM /Friday night through Tuesday/... As of 200 AM Thursday...
Key Messages
- Monitoring potential for SCA conditions this weekend into early next week
High pressure overhead on Friday will shift east on Saturday as low pressure develops well to the south of the ENC waters. The tightening gradient between this low and strong high pressure over New England should lead to building northeasterly winds over the weekend, with the potential for 20-25kt wind gusts. Guidance has backed off on the strength of the developing low to our south, but persistent, and building, northeasterly flow should lead to seas building to 5-8ft, especially by Sunday. It should be noted that the potential exists for a period of 8-10ft seas during this time, especially in the contraflow against the Gulf Stream south of Cape Hatteras.
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.MHX WATCHES/WARNINGS/ADVISORIES... NC...None. MARINE...None.
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SYNOPSIS...MHX NEAR TERM...RJ SHORT TERM...RJ LONG TERM...RM AVIATION...RM/RJ MARINE...RM/RJ
NWS mhx Office Area Forecast Discussion