Area Forecast Discussion
Issued by NWS Wilmington, NC

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331 FXUS62 KILM 011422 AFDILM Area Forecast Discussion National Weather Service Wilmington NC 922 AM EST Thu Dec 1 2016 .SYNOPSIS... A cold front moved offshore this morning and high pressure will build in from the west over the next several days, bringing dry weather and gradually cooling temperatures. Low pressure developing to our south will bring increasing rain chances next week, particularly on Tuesday. && .NEAR TERM /THROUGH TONIGHT/... As of 930 AM Thursday...The cold front is now offshore and drier air is building into the coastal Carolinas on westerly winds. Visible satellite imagery shows clouds clinging to the coastal counties, with sunny conditions expected to spread down to the beaches in the next 60-90 minutes. Dewpoints have fallen into the 40s across the SC Pee Dee region, and this drier air should advect down to the coast as well. In fact the largest change to the forecast was to bring forecast dewpoints down by ~5 degrees through the remainder of the day, with attendant decreases in forecast relative humidity. Forecast highs have been increased slightly as well, with highs expected to range from the lower 70s across the Wilmington area to the upper 60s west of I-95. && .SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/... As of 300 AM Thursday...High pressure will be reinforced from the NW Friday night into Saturday. The forecast area will remain under the influence of high pressure through the period with a good deal of sunshine. A digging southern stream system will be organizing across the southern plains and western Gulf states, but its impacts will remain to our west and southwest through Saturday night. It will be seasonably cool with highs in the mid 50s to lower 60s, with Saturday being the cooler of the two days. Lows will be in the mid and upper 30s Friday night. Clouds may begin to become more prevalent overnight Saturday, so will forecast lows in the upper 30s to lower 40s that night. && .LONG TERM /SUNDAY THROUGH WEDNESDAY/... As of 300 AM Thursday...Models indicate split flow in the mid- upper levels thru early Wed. From the Carolinas southward, this area will be under the influence of sw to wsw upper air flow coming from the slowly eastward moving Mexican cutoff/closed upper low that will push into southern TX Mon evening. Some minor timing issues thereafter, but for the most part, models open this upper low into a trough, and further weakens it as it lifts northeast into and thru a longwave ridge aligned over the East Coast of the U.S. late Tuesday. It moves, underneath the longwave ridge, to off the Mid-atlantic states Wed. Overall, this pattern suggests more clouds and a slight chance for pcpn initially, then transitions to a possible damming scenario on Mon thru early Wed with a coastal front/trough lurking just off the immediate coast. At this point in time, models do not bring the coastal front/trough onshore. Thus, overall temps this period will remain at or slightly below climo with no big warm- up given this scenario playing out. Unless, the coastal front moves onshore, then a temperature forecast bust will definitely occur. && .AVIATION /12Z THURSDAY THROUGH MONDAY/... As of 12Z...ILM may see a shower or two over the next hour or so, otherwise expect VFR conditions at all locations through the forecast period. Front is currently along the coast with winds at the coastal terminals expected to shift to the west by TAF valid time. Skies will scatter along the coast by mid morning while winds will continue to rotate clockwise to the northwest by afternoon. Light winds tonight with high pressure building in. Extended outlook...Expect mainly VFR. Except, clouds and pcpn will return at the end of this period with some MVFR/IFR conditions possible late Sunday thru Monday. && .MARINE... NEAR TERM /THROUGH TONIGHT/... As of 930 AM Thursday...The cold front is pushing across the coastal waters now, shifting southwest winds to the west. Westerly winds of 10-15 knots are expected much of the day with clearing skies and dry weather. Seas remain quite large due to the strong southerly winds we experienced over the past 24 hours. The small craft advisory will remain posted through late morning for the SC waters, and through early afternoon for the NC waters. SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/... As of 300 AM Thursday...High pressure will be the main influence across the waters. The wind direction will remain from the NW or N through the period, trending to the NE toward sunrise Sunday. Wind speeds will be 10 to 15 kt Friday, but as the pressure gradient briefly tightens in response to reinforcing high pressure from the northwest, wind speeds will trend higher, 15 to 20 kt Friday night into Saturday morning before returning to 10 to 15 kt Saturday afternoon and night. Seas will be 2 to 3 ft with perhaps some 4 ft seas late Friday night into Saturday for portions of the outermost waters. LONG TERM /SUNDAY THROUGH MONDAY/... As of 300 AM Thursday...For this 2 day period, winds and seas will overall be in a diminishing/subsiding trend respectively from Sunday into the 1st half of Monday. For the 2nd half of Monday, models do want to instigate a damming scenario with sfc high ridging south-southwest across the Central Carolinas from the NE states. And the development of a coastal front/trough just offshore from the coast. At this point, models bring the front/trough into the local waters late Monday into Tuesday, but not onshore and inland. Nevertheless, this will make forecasting wind directions a hair puller for the latter end of this period. The sfc pg will start out loose but tighten some at the end of this period. This results in wind speeds increasing especially on the offshore side of the coastal front late Mon into Tue. Significant seas will mainly be dominated and a function of wind driven waves, especially at the end of this period. Eventhough, latest Wavewatch3 shows SCA thresholds being met Monday night, will hold off given the too many ifs that could occur preventing this SCA possibility. && .ILM WATCHES/WARNINGS/ADVISORIES... SC...None. NC...None. MARINE...Small Craft Advisory until 10 AM EST this morning for AMZ254- 256. Small Craft Advisory until 1 PM EST this afternoon for AMZ250- 252. && $$ SYNOPSIS...TRA NEAR TERM...TRA SHORT TERM...RJD LONG TERM...DCH AVIATION...DL

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