Area Forecast Discussion
Issued by NWS Wilmington, NC

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328 FXUS62 KILM 271214 AFDILM Area Forecast Discussion National Weather Service Wilmington NC 814 AM EDT SAT AUG 27 2016 .SYNOPSIS... Warm late summer conditions will prevail through the weekend. The chance of showers will increase as well, as moisture from the tropics moves across the area early next week. A strong cold front is expected to move across the region late this week. && .NEAR TERM /THROUGH TONIGHT/...
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As of 637 AM Saturday...No changes to the ongoing forecast as mainly clear skies greet sunrise. The former circulation of Fiona south of Bermuda contained winds near 35 mph east of the center per aircraft measurement last night, so it will be interesting to see what transpires today as this feature moves west toward the Carolinas taking in the dry air aloft. The previous forecast discussion follows. A gleaming start to Saturday shaping up with a clear early morning view of a waning crescent moonrise, signaling clear skies to the east. A surface ridge axis positioned SW to NE across the area was resulting in a relaxed pressure and wind regime. Vapor movies shows an upper ridge north of the region with an embedded impulse currently positioned across eastern VA and the Delmarva coast. Vad Wind Profile this morning shows 30-40 KT mid- level NE flow, which will usher deepening H7 moisture today. As this impulse is driven SW today, a shower or TSTM may pop over Bladen or Robeson county in the middle afternoon, spreading SW into the SC interior in the late afternoon. Convection may linger tonight along the I-95 corridor as a secondary upper wave transits the interior overnight. Maximums above normal today, middle 90s over the deeper interior and lower 90s across the coastal interior in a light onshore wind. Min temps daybreak Sunday 71-74, 75-77 at the coast.
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&& .SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/... As of 300 AM Saturday...Primary headline this period is a transition to a tropical influence as the circulation of former Fiona drifts landward toward the Cape Fear region late in the period Monday night into Tuesday. This feature will be watched closely over the next few days. The other tropical item of note remains arrival of long period swell from the Gaston wind-field on Sunday. Wave amplitude will remain low, but could build to 2 ft every 13-14 seconds Monday, prompting an significant rip current risk. Pop values increase gradually through the period as the tropical influence does so, especially late in the period as PWAT values begin to notably rise. && .LONG TERM /TUESDAY THROUGH FRIDAY/... As of 300 AM Saturday...Increasing tropical moisture across the area along with persistent on shore flow will produce an increase in shwrs/tstms through mid week. Looks like the combination of moisture remnants from Fiona along with tropical wave/low reaching up from the south, as well as, weakening ridge moving north away from Carolinas will produce plenty of clouds and more widespread shower activity especially along and just off the coast on Tues into Wed. GFS shows greatest pcp water values up over 2 inches located over area Tues night into Wed. By Thurs this moisture should be pushed off to the east as mid to upper trough pushes a cold front into the Carolinas. The winds will shift around to the N-NW on back end of tropical wave/low which may help to advect in some drier air but overall expect front to produce enhanced convective activity, mainly farther south over South Carolina by Friday. Summerlike temps in the mid 80s to 90 should take a dip heading into end of period down into the mid 80s. && .AVIATION /12Z SATURDAY THROUGH WEDNESDAY/...
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As of 12Z...Any MVFR vsbys at the KLBT/KFLO terminals will improve to VFR around 12Z. Predominately VFR through this evening at all terminals. Light northeast winds will become E-SE 5-15 kts as the day progresses, highest southern coastal terminals. Shower or thunderstorms are possible after noontime, mainly from KILM- KLBT, then south to KFLO. Due to sparse coverage think the chance of sub VFR with any activity is low. There is an increasing chance of MVFR/IFR after midnight. Winds will initially be light NE allowing for fog to develop. Then as wind speeds further increase vsbys should improve as the fog is lifted, but this could result in the development of a sct-bkn LIFR/IFR stratus layer. EXTENDED OUTLOOK...Increasing chance of TEMPO sub VFR each day as tropical moisture/shower potential increases.
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&& .MARINE... NEAR TERM /THROUGH TONIGHT/... As of 637 AM Saturday...Smooth sailing, although overall lack of wind may offer slow sailing. A friendly marine environment on tap regardless, as light winds and manageable seas prevail today and tonight. Seas of 2-4 feet slightly elevated in ESE waves 2-3 ft every 11 seconds originating from circulation of former Fiona. This should slowly decay to 9 seconds overnight. Light onshore winds today and tonight. SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/... As of 300 AM Saturday...Decent marine conditions will prevail this period in terms of welcoming light winds, generally NE-E Sunday and Monday. Increasing swell waves may elevate sea heights to 4 ft Monday night, and an increase in showers and TSTMS can be expected, as a tropical disturbance, and what was once Fiona, approaches Cape Fear late Monday night. Mariners should monitor the latest forecasts regarding this feature. LONG TERM /TUESDAY THROUGH WEDNESDAY/... As of 300 AM Saturday...Diminishing longer period E-SE swells, up to 14 seconds, will mix in with E-NE wind waves through the period. Overall expect winds in the 10 to 15 kt range and seas 2 to 4 ft. && .ILM WATCHES/WARNINGS/ADVISORIES... SC...None. NC...None. MARINE...None. && $$ NEAR TERM...MJC SHORT TERM...MJC LONG TERM...RGZ AVIATION...MRR

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