Area Forecast Discussion
Issued by NWS Albany, NY
Issued by NWS Albany, NY
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455 FXUS61 KALY 171738 AFDALY AREA FORECAST DISCUSSION National Weather Service Albany NY 138 PM EDT Fri May 17 2024 .SYNOPSIS... High pressure will bring fair and dry weather today with partly to mostly sunny conditions. Clouds increase tonight with some isolated to scattered light rain showers mainly west of the Hudson River Valley ahead of a weakening cold front and an upper level disturbance. The first half of the weekend will feature more clouds than sunshine with isolated to widely scattered showers, but Sunday will turn dry and pleasant weather with temperatures trending above normal. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... As of 138 PM EDT...A coastal low continues to slowly spin offshore the mid Atlantic States for today. Meanwhile, another upper level disturbance is starting to approach from the west. Enough upper level ridging and a weak high pressure area northeast of the area continue to keep dry and quiet weather in place over the area early this afternoon. Some cloud cover (mainly mid and high level clouds) has been spreading into the area from the west. Despite these clouds, most areas are still partly sunny and valley temps have warmed into the lower to middle 70s. Through the afternoon hours, cloud cover will slowly increase. Visible satellite imagery shows low level clouds increasing from both the east and south, while mid and high level clouds are coming in from the west. Skies will generally trend towards mostly cloudy for late in the day. A few brief sprinkles are possible across the Adirondacks (perhaps parts of the Mohawk Valley, Sacandaga Region, and the Saratoga Springs and Glens Falls areas too), but any precip looks very light and brief. Max temps were accepted close to the warmer ECM MOS values with highs in mid and upper 70s in the valleys with a few 80F readings near KPOU. Mid 60s to lower 70s will be common over the mountains and hilltowns. The winds will be light from the east to southeast at 5-10 mph. && .SHORT TERM /6 PM THIS EVENING THROUGH SUNDAY NIGHT/... Tonight...An upper level trough and a weak cold front approach the eastern Great Lakes Region and western NY. Some isolated to scattered showers with the front and the mid level short-wave moving towards the southern Quebec will likely impact locations west of I-87 overnight. The moisture convergence is weak and the front weakens, so any pcpn will be light and scattered over or near the southern Dacks, w-central Mohawk Valley, Schoharie Valley and Catskills. Clouds increase over the rest of the forecast area with lows falling into the lower to mid 50s with some 40s over the higher terrain. The diffuse mid level trough will be near or over the forecast area on Saturday. The sfc trough/weak cold front will be to the west. The better short-wave energy digs to the south of the forecast area over the mid Atlantic States. More clouds than sun is expected and some light isolated to widely scattered showers are possible from the Berkshires, Capital Region and eastern Catskills north and west. Temps were increased above the cooler MAV/MET MOS numbers closer to the ECM MOS with highs in the upper 60s to lower 70s in the lower elevations and 60s over the mtns. Saturday Night into Sunday...The guidance is differing slightly in the evolution of the mid and upper level ridge (Rex Block) building in from Plains/Midwest into NY/western New England and the placement of a coastal low. We have gone to a drier trend still Sat night with variable cloudiness and temps cooling into the 40s to around 50F over the higher terrain and 50-55F in the valleys. Heights increase aloft on Sunday with the folding over ridge into the region. Some clouds and even sprinkles may linger along and east of the CT River Valley. Most of the forecast area should experience fair and dry weather with partly to mostly sunny skies and temps trending above normal. Highs could reach the upper 70s to around 80F in the Hudson and Mohawk River Valleys with mid 60s to mid 70s over the hills and mtns and near the CT River Valley. A sfc anticyclone builds in over NY and PA with the high amplitude ridge aloft. Near deal radiational cooling conditions will set up with mostly clear skies and light to calm winds with radiational/valley patchy mist/fog in spots. Lows will fall into the mid 40s to mid 50s. && .LONG TERM /MONDAY THROUGH FRIDAY/... A Rex Block amplifying across much of the East Coast will ensure dry conditions for the start of the work week. Monday will, therefore, be a mainly clear day with highs in the mid/upper 70s to low 80s. One or two stray showers are possible in the Southwest Adirondacks Monday night as an upper-level disturbance and associated weak boundary pass by to the north, but any precipitation that may develop would be very light in nature. That said, cloud cover will increase a modest amount mainly north of the Capital District Monday night, but skies will remain partly cloudy to mostly clear. Low temperatures Monday night will be in the 50s. Clouds decrease Tuesday as the aforementioned system pushes further east. Once again, another mainly clear day can be expected for much of Tuesday with high temperatures in the upper 70s to low and possibly even mid 80s. Clouds will increase a bit Tuesday evening as an upper-level shortwave a looks to pass and the attendant surface low pass by to our north and west. Low temperatures Tuesday night, similarly to those of Monday night will fall into the 50s. By Wednesday, the Rex Block will begin to break down in advance of an approaching upper-level trough and associated frontal system. There remains some uncertainty in the timing of this system, but general consensus points to a rain onset Wednesday evening/night. Rain will last through the night Wednesday into Thursday as the cold front passes through the region, but it is unclear how long rain will persist upon the complete frontal passage. Some sources of guidance point to showers continuing through Thursday with troughing remaining over the region while others indicate weak ridging that could inflict subsidence and cut the duration short. For now, maintained chance PoPs Thursday. In addition to partly cloudy skies, Wednesday will feature highs in the mid/upper 70s to low 80s. Wednesday night`s lows will be a few degrees warmer in some areas compared to Monday and Tuesday night with increased cloud cover. Expect 50s to low 60s. Thursday`s highs will be the coolest of the period after the cool fropa. Temperatures will be in the upper 60s to upper 70s. && .AVIATION /18Z FRIDAY THROUGH TUESDAY/... VFR conditions expected to continue across the region through the end of the TAF period. SCT to BKN ceilings around 5-8kft will continue developing this afternoon with cirrus clouds (BKN ceilings around 20kft) continuing to flow eastward. A few sprinkles may develop this afternoon as well but given no impact to flying conditions or changes to flight categories, did not include VCSH in the latest update. Once we lose daytime heating, cumulus clouds around 5-8kft diminish by 00 UTC with just SCT-BKN ceilings around 10-15kft overnight. Ceilings lower to around 8-10kft by or shortly after 12 UTC and continue as such through the end of the TAF period at all terminals. Light and variable winds through tonight. Then winds develop out of the northeast becoming sustained 5-8kts occur by or shortly after 12 UTC. Outlook... Saturday Night: No Operational Impact. NO SIG WX. Sunday: No Operational Impact. NO SIG WX. Sunday Night: No Operational Impact. NO SIG WX. Monday: No Operational Impact. NO SIG WX. Monday Night: No Operational Impact. NO SIG WX. Tuesday: No Operational Impact. NO SIG WX. Tuesday Night: No Operational Impact. NO SIG WX. Wednesday: Low Operational Impact. Slight Chance of SHRA. && .ALY WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. MA...None. VT...None. && $$ SYNOPSIS...Wasula NEAR TERM...Frugis/Wasula SHORT TERM...Wasula LONG TERM...Gant AVIATION...Speciale