Area Forecast Discussion
Issued by NWS Albany, NY
Issued by NWS Albany, NY
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478 FXUS61 KALY 010240 AFDALY AREA FORECAST DISCUSSION National Weather Service Albany NY 1040 PM EDT Tue Apr 30 2024 .SYNOPSIS... Showers and isolated thunderstorms will diminish tonight as a low pressure system and frontal boundary moving across the region. Behind this system, mainly dry and seasonable weather is expected for Wednesday and Thursday. Continued comfortable conditions are expected for Friday into the weekend, although there will be a chance for some showers over the weekend. && .NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/... .UPDATE as of 1040 pm EDT...A low pressure system and an inverted sfc trough continue to move across eastern NY and New England this evening. The showers associated with the disturbance are decreasing, as the back edge has reached the Capital District/southern VT and the northern Catskills. The showers should diminish between 04Z-07Z/WED with lingering low stratus and patchy fog developing. We added some patchy fog in the major valleys and across western New England. There is not strong cold advection in the wake of the disturbance with lows falling into the mid 40s to mid 50s. && .SHORT TERM /6 AM WEDNESDAY MORNING THROUGH THURSDAY NIGHT/... On Wednesday, skies will start off mostly cloudy for much of the area, but there should be increasing amount of sun through the day. A weak disturbance sliding by to the north could allow for a brief shower or sprinkle during the midday hours (mainly for northern and eastern areas), but this looks fairly isolated. Any shower would be brief and rather light, as both moisture and forcing will be limited. Have sided close to the blended guidance for highs with valley areas in the mid 60s to low 70s and upper 50s to mid 60s in the high terrain. A few more stray showers are possible overnight across northern areas with another disturbance passing by, but overall, any precip looks light and spotty and most spots will be staying dry. Lows look to fall into upper 40s to low 50s once again with a partly to mostly cloudy sky. Upper level ridging will be starting to build over the area for Thursday and Thursday night. This should allow for dry conditions with clearing skies, especially by Thursday night. Daytime temps look fairly warm thanks to decent mixing and a dry air mass in place, with valley temps in the 70s. Overnight lows will generally be in the 40s. && .LONG TERM /FRIDAY THROUGH TUESDAY/... The extended forecast period begins with tranquil weather, as a mid and upper level ridge axis is situated over NY and and the Mid Atlantic Region. H850 temps will be running slightly above normal based on the latest NAEFS guidance. A sfc anticyclone will be building in from north-central Quebec. Max temps will be running slightly above normal, as we went close to the NBM guidance with highs in the upper 60s to lower 70s in the valleys and upper 50s to mid 60s over the higher terrain. The ridge axis should hold on over NY and New England Fri night with just some high clouds increasing. Lows fall off into the 40s with some upper 30s over the southern Greens. The weekend becomes more unsettled, as a low pressure system and a warm front approaches from the Great Lakes Region and Ohio Valley. Clouds increase on Saturday with isolated to scattered showers especially late in the day. A few thunderstorms may be possible over the western Dacks. The max temps will trend a little cooler than normal with more clouds than sunshine with 50s and 60s. The boundary becomes occluded with the weak sfc wave Saturday night and the chances of showers increase, as a broad mid and upper level trough sets up over central Canada/nrn Plains and the Upper Midwest. Lows will be mainly in the 40s. The occluded front takes its time moving over the region with the downstream ridge holding. A chance of showers was continued for Sunday into early Sunday night. Max temps will continue below normal with 50s to lower 60s for highs, as more clouds than sun prevail. Partly cloud skies persist Sunday night with lows mainly in the 40s again. A brief period of fair weather is expected to open the week with a sfc anticyclone building in from the Great Lakes Region in the wake of the front. Temps should rise slightly above normal with west to northwest flow aloft. The next northern stream disturbance approaches from the Upper Plains Mon night to Tue along with its warm front with increasing clouds with the next chance of showers with perhaps a few thunderstorms. Temps continue slightly above normal. For the Day 8-14 outlook for the 2nd week of May, CPC is forecasting above normal temperatures and slightly above normal precipitation for eastern NY and western New England. && .AVIATION /03Z WEDNESDAY THROUGH SUNDAY/... Through 00z/Thu...A wave of low pressure and a frontal boundary will widespread showers with an isolated rumble of thunder across the eastern NY TAF sites prior to midnight with cigs/vsbys lowering to MVFR levels. The showers will taper in the early morning hours with low MVFR/IFR stratus setting up. The IFR stratus will likely be from KALB/KPSF north/northeast to KGFL. KPOU may hold as low MVFR, but we did add a period of IFR stratus for KPOU 07Z-14Z/WED. The stratus will linger most of the morning, but should begin to break up between 13Z-16Z/WED. We increased the cigs to MVFR levels in the 1.5-3.0 kft AGL range and to lower VFR at most KGFL/KALB/KPOU 3.5-5 kft AGL and KPSF may hold as high MVFR in the 3.0 kft AGL. The winds will vary in direction at 5 KT or less overnight. They will increase from the northwest to west at less than 10 KT during the late morning through the afternoon. Outlook... Wednesday Night: Low Operational Impact. Breezy. NO SIG WX. Thursday: Low Operational Impact. Breezy. NO SIG WX. Thursday Night: No Operational Impact. NO SIG WX. Friday: No Operational Impact. NO SIG WX. Friday Night: Low Operational Impact. NO SIG WX. Saturday: Moderate Operational Impact. Slight Chance of SHRA. Saturday Night: Moderate Operational Impact. Chance of SHRA. Sunday: Moderate Operational Impact. Chance of SHRA. && .HYDROLOGY... Showers and thunderstorms last night into this morning produced some locally heavy rainfall over the Sacandaga and Saratoga Regions, with up to two inches in some locations. Additional showers and thunderstorms will spread across the region through the late evening hours. Most of the activity will probably be southern areas with this round, but enough northern areas will see some additional rainfall again for the late day hours. The low level flow out of the south will bring in plenty of moisture into the region although dewpoints and PWATs will not be overly excessive for this time of year. Some of these showers and thunderstorms may contain heavy downpours, which could lead to ponding of water in urban or low lying areas. WPC has placed much of the region within a Marginal Risk for Excessive Rainfall during this period. Overall, rainfall amounts will light enough to avoid any flooding of main stem rivers. Drier weather will return for Wednesday through the late week. Although some additional showers are possible from time to time, amounts are not expected to be excessive and no hydrologic issues are anticipated through the late week. && .ALY WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. MA...None. VT...None. && $$ SYNOPSIS...Frugis/Wasula NEAR TERM...Wasula SHORT TERM...Frugis LONG TERM...Wasula AVIATION...Wasula HYDROLOGY...Frugis