Area Forecast Discussion
Issued by NWS Wilmington, NC

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761 FXUS62 KILM 201955 AFDILM Area Forecast Discussion National Weather Service Wilmington NC 255 PM EST Mon Feb 20 2017 .SYNOPSIS... Temperatures will remain unseasonably warm through much of the week. High pressure will slowly build across the area through Tuesday, shifting offshore Wednesday. A trough of low pressure will bring increased cloudiness and some showers mid week. Near record warmth will come Friday and Saturday with an increasing chance of showers ahead of an approaching cold front Friday night into Saturday. Cooler and drier high pressure will build in behind the cold front Saturday night into early next week. && .NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
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As of 300 PM Monday...High pressure will be reinforced from the north through tonight. High pressure aloft will continue to migrate eastward with its ridge axis reaching the eastern Carolinas Tue morning. High and thin clouds will filter across the sky tonight. Lows tonight will be similar to early this morning, in the 40s and near 50 at the beaches.
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&& .SHORT TERM /6 AM TUESDAY MORNING THROUGH WEDNESDAY NIGHT/...
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As of 300 PM Monday...An upper ridge will continue to drift eastward with its axis migrating offshore Tue afternoon and evening. At the surface, high pressure centered across New England and the northeastern states will ridge across the eastern Carolinas. Low pressure along the Gulf coast Tue will move to south Florida Wed night. An onshore flow will allow marine stratocumulus to rotate inland and these clouds should be most prevalent along the coast Tue afternoon. A series of shortwave troughs, embedded in developing WNW flow will bring a general increase in cloud cover, from W to E Tue night through Wed night. There may be some late night fog Tue night as onshore flow brings increasing dewpoints. The column does moisten adequately enough to support the inclusion of a small risk for showers, mainly Wed afternoon and eve and these look to be largely diurnally driven. The shower risk Wed eve will shift offshore, but a developing coastal trough may skirt the coast and will include a small risk for showers along the coast overnight Wed. Perhaps another round of fog or even stratus Wed night as onshore flow keeps the low levels moist. Cooler air at 850 mb on Tue and an onshore flow should keep temps from rising above the mid and upper 60s along the more coastal environs while the beaches may be stymied in the lower 60s. Further inland, it should be at least a couple degrees warmer, around 70. A good deal of clouds will be around Wed, but the column will be a little warmer. Despite the onshore flow, we think lower to mid 70s will be quite common away from the cooling impacts of the ocean. The immediate coast should not rise out of the 60s. Lows will be in the 50s through the period, so it certainly will not feel like February.
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&& .LONG TERM /THURSDAY THROUGH MONDAY/...
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As of 300 PM Monday...Medium range guidance remains fairly consistent on the events for the extended period. The flow will show a little amplitude through the first half of the period as a shortwave rides through the midwest and Ohio valleys with a cold front at the surface. Models have trended lower with the moisture with this system but we maintain some low chance pops for Friday into the day Saturday. We also have slight chance pops for Thursday via the sea breeze or pulse type convection. Later Saturday through Monday should be mostly dry. Temperatures remain well above climatology backing off a little Sunday and Monday.
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&& .AVIATION /20Z MONDAY THROUGH SATURDAY/... As of 18Z...High confidence in VFR through today. Some MVFR possible at the coast on Tuesday. Other than scattered high cirrus today, high pressure is the dominant feature as it extends down from eastern Canada. With the ridge axis to the west, winds will be E/NE and light through tonight, and despite this being an onshore direction, the airmass origin is very dry so there are no clouds or fog forecast overnight. During Tuesday, as winds remain from the E at 5-10 kts, enough moist advection occurs on the onshore flow to allow for scattered to potentially broken MVFR stratocu along the coast. For now have capped the TAFs without a CIG, but MVFR is possible after sunrise. Extended Outlook... Patchy fog possible late Tuesday night. Isolated showers late Wednesday through Thursday. Showers possible Saturday with a cold front. && .MARINE...
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NEAR TERM /THROUGH TONIGHT/... As of 300 PM Monday...High pressure will be reinforced from the north through tonight. The wind direction will be from the NE. Wind speeds will be up to 10 to 15 kt, highest overnight. Seas will build about a foot through tonight. A few 4 ft observations are expected across the outermost waters late tonight. SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/... As of 300 PM Monday...The center of surface high pressure will drift south and be centered just offshore of the eastern Carolinas Wed, migrating further eastward Wed night. Meantime, low pressure along the Gulf Coast will move slowly southeast across the Gulf of Mexico and should be situated across south Florida Wed night. NE winds Tue morning will veer to easterly during Tue afternoon and SE Tue night. An Ese to SE wind will prevail Wed and Wed night. The strongest winds this period are expected Tue, up to 10 to 15 kt. A tightening pressure gradient is expected to develop to our S Wed night. Seas will be 2 to 4 ft Tue morning. Seas will trend a little lower Tue afternoon and Tue night, 2 to 3 ft. Seas will be building to our S Wed and Wed night and some of there higher seas will be working their way into our waters late in the period. LONG TERM /THURSDAY THROUGH SATURDAY/... As of 300 PM Monday...Relatively light wind fields for most of the day Thursday and even into Friday with a southeast flow of ten knots or so. Winds finally pick up modestly Saturday ahead and in the wake of a cold front on the order of 10-15 knots from the southwest. Significant seas will be 1-3 feet Thursday into Friday then increase considerably as a decent swell component moves in from the southeast.
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&& .ILM WATCHES/WARNINGS/ADVISORIES... SC...None. NC...None. MARINE...None. && $$ SYNOPSIS...SHK NEAR TERM...RJD SHORT TERM...RJD LONG TERM...SHK AVIATION...JDW

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