005 FXUS61 KALY 111746 AFDALYAREA FORECAST DISCUSSION National Weather Service Albany NY 146 PM EDT Sat Oct 11 2025
.SYNOPSIS... Increasing clouds, but primarily dry day today as an upper level disturbance approaches from the west and high pressure departs to the east. Continued uncertainty surrounding an impending coastal storm makes for a difficult forecast for the end of the Holiday weekend, but there remains moderate to high confidence in at least areas within and south of the Capital District having measurable rainfall.
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.SHORT TERM /THROUGH MONDAY/... Key Messages:
- Uncertainty surrounding the evolution of an impending coastal system continues to limit confidence in resulting rainfall totals Sunday afternoon through Monday. However, probabilities for at least 1" remain about 50-70% from the Capital District, south, and east.
Discussion: The surface anticyclone that has dominated the region over the last several days now rests off the coast of Cape Cod, yielding falling heights across eastern New York and western New England as a closed low enters the eastern Great Lakes as seen on latest infrared satellite imagery. Throughout the day, this low will dig farther south-southeast into the eastern Great Lakes/western New York/northeast Ohio Valley area, though dry conditions will be maintained as upper- level southwesterly flow advects dry air into the region about its forward flank from a building ridge in the Plains/Midwest. Despite the continued surface dryness, clouds will be on the increase both from this disturbance and an area of low pressure beginning to take shape along the Southeast Coast. Given this, highs today will be widely in the 60s with upper 50s across higher terrain areas.
Tonight, the low slides a bit farther east into our CWA, bringing some highly scattered, light rain showers, mainly to portions of the Eastern Catskills and western Mohawk Valley, though an isolated sprinkle or two also cannot be ruled out in the Mid-Hudson Valley. All other areas will remain dry, and, with more extensive cloud coverage, lows will certainly be more mild in comparison to recent nights with values in the upper 30s to low 50s. Attention then shifts to Sunday through Monday where unremitting uncertainty in the evolution of an impending coastal system poses a considerable forecast challenge.
By Sunday morning, the low aloft that looks to reside more or less overhead looks to weaken in response to a building ridge and eventual anticyclone over the Canadian Maritimes. Meanwhile, the aforementioned area of low pressure currently located in the deep Southeast will strengthen and make a northward push after undergoing cyclogenesis, both at the surface and aloft, near the coast of the Carolinas on Saturday. As the coastal surface low begins to drift northward Sunday morning, a vorticity maximum pulsing about the northeast periphery of the associated upper low looks to translate into the development of a secondary coastal low off the Mid-Atlantic Coast. Aloft, the northerly low overhead of or closely adjacent to our region and the upper low in the Southeast look to continually weaken until both are absorbed into a larger-scale trough that encompasses the entire East Coast by Sunday afternoon. Based on relatively close consensus in latest sources of guidance, there is moderate to high confidence in the evolution of the environment up until this point. However, what follows is where the most uncertainty comes into play.
The spatial spread and amounts of rain that are seen across eastern New York and western New England are going to be highly dependent on what occurs with the "secondary" coastal low. However, the classification of "secondary" really only stands to describe the chronological order of the formation of the surface lows. In favored solutions, at this time, the "secondary" low really becomes the primary and will be the feature of interest in terms of the resulting conditions seen across our CWA. Now, that said, the depictions of the track of this new primary low continue to be highly varied with some ensembles resolving a more east-northeast trajectory and others north-northeast. The likely causing factor of this variation is the depicted position and strength of the previously mentioned developing anticyclone over the Canadian Maritimes. This feature, in some cases, looks to remain stationary overhead the track of the coastal low which would stunt it`s progress to the east. Additionally, with a ridge maintained over the Midwest/western Ohio Valley and another upper-level anticyclone in the southwest Atlantic, the track of the low could be forced, or blocked, on a rather narrow path. This solution would bring the coastal low closer to the upper Mid- Atlantic and Long Island Coastlines, yielding more widespread and potentially heavier rainfall especially for the Mid-Hudson Valley, Eastern Catskills, and southwest New England from Sunday afternoon through Monday. However, another very realistic possibility is the more east- northeast track of the coastal low which would result from the high in the southwest Atlantic being even farther offshore and the crest of the ridge to the west extending farther eastward. Here, the deformation axis of heaviest rainfall would be displaced to the east such that we see less in the way of rainfall amounts and less widespread or consistent areas of locally heavier rainfall Sunday afternoon through Monday. According to the latest run of the NBM, QPF amounts have lowered a bit and the spatial spread of higher probabilities of at least one inch of rainfall has decreased, owing to a closer solution like the latter described situation. That said, probabilities for at least one inch of rainfall still remain around 50-70% from the Capital District south and east. Rainfall totals across eastern New York and western New England currently range from about 0.3" in the Adirondacks to a little over an inch and a half for a small portion of the Mid- Hudson Valley and Litchfield County through Monday. We will reiterate here, too, that these rainfall amounts are all beneficial and flooding is not a concern.
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.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/... As the coastal system departs, scattered showers will linger Monday night into Tuesday morning, but by Tuesday afternoon dry conditions will resume once again. The remainder of the week will feature mainly dry conditions, though a passing disturbance and cold front could bring some isolated to scattered showers Wednesday.
High temperatures throughout the long term period will begin in the 50s and 60s Tuesday and Wednesday before we drop into the 40s and 50s Thursday. Friday`s highs will be similar to those of Tuesday and Wednesday, though a few degrees cooler with upper 40s across higher terrain and 50s to near 60 elsewhere. Lows will start out in the upper 30s to upper 40s Monday night and Tuesday night before falling to the upper 20s to 30s Wednesday night and Thursday night. Expect 30s and low 40s Friday night.
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.AVIATION /18Z SATURDAY THROUGH THURSDAY/... Through 18z/Sun...VFR conditions are expected across all sites this afternoon through the overnight hours. A greater coverage of clouds is expected at KPOU/KPSF through this afternoon but bases should remain above 3000 ft. FEW-SCT coverage of fair weather cu is expected at KALB/KGFL. Some clearing is expected tonight before clouds thicken and lower between 12-18z/Sun from south to north as a coastal low approaches, resulting in the transition to some MVFR cigs. Rain showers may approach KPOU toward the end of the TAF period so introduced this with a VCSH at 16z/Sun. Light/variable wind through tonight will become northeasterly at around 10 kt on Sunday with some higher gusts to around 20 kt, especially at KPSF/KPOU.
Outlook...
Sunday Night: High Operational Impact. Likely RA. Columbus Day: High Operational Impact. Likely RA. Monday Night: Moderate Operational Impact. Chance of SHRA...RA. Tuesday: Low Operational Impact. NO SIG WX. Tuesday Night: No Operational Impact. NO SIG WX. Wednesday: No Operational Impact. NO SIG WX. Wednesday Night: Low Operational Impact. NO SIG WX. Thursday: Low Operational Impact. Breezy. NO SIG WX.
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.HYDROLOGY... A coastal low will track close to the the NJ and Long Island Coast Sunday through Monday. Minor tidal flooding may occur in the mid Hudson Valley from Kingston south to Poughkeepsie late Sunday through Monday. The latest NERFC forecast for PKMN6 is projecting minor tidal flooding early Sunday evening into Monday morning.
Please monitor our latest forecasts on the NWPS page at https:/water.noaa.gov/area/ALY.
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.ALY WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. MA...None. VT...None.
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SYNOPSIS...37 SHORT TERM...37 LONG TERM...37 AVIATION...33 HYDROLOGY...15/37
NWS ALY Office Area Forecast Discussion