Area Forecast Discussion
Issued by NWS Burlington, VT

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566 FXUS61 KBTV 250551 AFDBTV Area Forecast Discussion National Weather Service Burlington VT 151 AM EDT Sun Sep 25 2016 .SYNOPSIS... Tranquil early fall weather will persist through Monday, as a large area of Canadian high pressure crosses the region. The crisp air mass will bring patchy frost in spots this morning, and again on Sunday morning, and cool daytime temperatures with Sunday`s highs in the upper 50s to lower 60s. Developing south winds will allow for moderating temperatures on Monday, with high temperatures reaching the mid to upper 60s in most valley locations. A frontal system approaching from the west will bring our next rainfall event Monday night into Tuesday. && .NEAR TERM /THROUGH MONDAY/... As of 134 AM EDT Sunday...Chilly start this morning with local readings below freezing in the Adirondacks and the colder sheltered valleys of Vermont`s Northeast Kingdom. Frost advisory and freeze warning (Essex Co. VT) continue thru 12Z this morning. Also anticipating some patchy dense fog in the favored river valleys of central/ern VT...this should dissipate by 13-14Z, lasting longest in the CT river valley. Large Canadian high pressure shifts slowly ewd from sern Ontario into the North Country today, and crests over the region tonight. Looking for mostly clear skies with a dry air mass in place and large-scale subsidence. Some cyclonic flow aloft could bring a few passing clouds to far nern VT through the day, but overall will see sunny conditions. The 925-850mb temps are slightly cooler than Saturday, and as a result, anticipate aftn highs a few degrees cooler as well...generally upr 50s to lower 60s. Winds won`t be quite as strong as Saturday, but will see an increase to around 10 mph from the Northwest late morning thru afternoon. With the high pressure system overhead, better radiative cooling conditions for tonight. Expecting lows a few degrees colder...upr 30s Champlain Valley, but low-mid 30s elsewhere (and locally 27F at SLK). This will bring additional frost away from the immediate vicinity of Lake Champlain. Once we get through current frost event early this morning, will likely need additional frost/freeze highlights for Sunday night as well. Surface anticyclone shifts east of New England during Monday, and winds shift into the S-SE across the region. Should see temps rebound a bit...with aftn highs in the mid-upr 60s...except locally in the lower 60s across ern VT. Anticipate some increasing mid and upper level clouds later in the day from west to east as a large closed low crosses the central Great Lakes, and associated sfc cold front reaches far wrn NY. Frontal rain showers should hold off until Monday night. && .SHORT TERM /MONDAY NIGHT/... As of 324 PM EDT Saturday...Ridge of high pressure at the surface with building ridge aloft will lead to clear skies, light to calm winds and good radiational cooling conditions. 925mb temps of 3-5C will result in morning low temps at the surface in the mid/upper 20s to low 30s in the high terrain and low to upper 30s in the broad valleys. Tricky part of where lowest temps will occur will be somewhat dependent on fog formation. Expect some areas to see freezing fog, mainly in portions of the Adirondacks and Northeast Kingdom. Otherwise, widespread frost/freeze possible. Large closed mid-level low over the Great Lakes region will approach, with clouds moving into the North Country ahead of it during the day Monday. At the same time, 500mb ridge will crest over the forecast area, keeping conditions dry before the large mid-level low arrives. Winds will shift out of the south with max temps in the 60s. Precip arrives from west to east Monday night with PWATs increasing to over 1 inch and SSW low level jet of 30-40 kts at 850mb. This will likely result in enhancement of showery activity on SW facing slopes and some shadowing on leeward side. Also gusty winds esp in the high terrain will result. Temperatures will be noticeably warmer Monday night with clouds and winds...expect lows in the 40s to low 50s. && .LONG TERM /TUESDAY THROUGH SATURDAY/... As of 324 PM EDT Saturday...On Tuesday the 500mb closed low traverses across the central to southern Great Lakes as it digs southward with a dry slot moving into the North Country ahead of this low, behind the cold front which brings showers Monday night into Tuesday. This will result in bulk of rain showers exiting east during Tuesday afternoon. Low level jet will also exit east and PWATs look to decrease late in the day. As the mid level low digs southward into the Ohio River Valley Tuesday night into Wednesday, 500mb vort will break off into northern stream and southern stream. High pressure at the surface and bulk of energy either far to the south or north, expect mostly dry conditions Wednesday through Friday night, possibly into Saturday. ECMWF and GFS differ on the evolution and track of the southern stream energy. ECMWF has it become a closed low and meanders over the southern Appalachians late in the period. && .AVIATION /06Z Sunday THROUGH Thursday/... Through 06Z Monday...Mainly VFR/SKC, except local LIFR in fog at SLK/MPV early this morning through 12-13Z. Winds will remain light overnight, and pick up from the northwest around 10 knots after 14z Sunday and persist thru the remainder of the daylight hrs. Light and variable winds return after 00Z Monday. Outlook 00z Monday through Thursday... 06z Mon - 00z Tue: Mainly VFR. Overnight IFR with patchy fog possible. 00z Tue - 00z Wed: VFR trending to a mix of VFR/MVFR in scattered showers. 00z Wed - 00z Fri: Mainly VFR with isolated MVFR cigs. && .BTV WATCHES/WARNINGS/ADVISORIES... VT...Freeze Warning until 8 AM EDT this morning for VTZ004. Frost Advisory until 8 AM EDT this morning for VTZ003-006>008- 010>012-016>019. NY...Frost Advisory until 8 AM EDT this morning for NYZ026-027- 029>031-034-087. && $$ SYNOPSIS...Banacos NEAR TERM...Banacos SHORT TERM...KGM LONG TERM...KGM AVIATION...Banacos is the U.S. government's official web portal to all federal, state and local government web resources and services.