Area Forecast Discussion
Issued by NWS Buffalo, NY
Issued by NWS Buffalo, NY
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932 FXUS61 KBUF 160526 AFDBUF Area Forecast Discussion National Weather Service Buffalo NY 126 AM EDT Mon Sep 16 2024 .SYNOPSIS... High pressure will maintain the very warm, tranquil weather pattern across the area through at least Tuesday. A low pressure system moving inland from the Carolina coast to the Mid Atlantic will then spread moisture northward towards the area Tuesday night through the middle of the week. This will bring an increase in clouds and possibly a few showers by midweek, although the better chance of rain may stay south of our region. && .NEAR TERM /THROUGH TODAY/... Lather, rinse, repeat. Dominant, blocking high pressure surface and aloft over the Northeast US will essentially allow our weather to repeat again overnight through Monday, with very similar conditions to the past few days. Clear skies and light winds overnight will promote patchy fog east of Lake Ontario and across the river valleys of the Southern Tier. Lows will drop back into the upper 50s to lower 60s in most areas, with some low to mid 50s in the typical cool spots of the Southern Tier and North Country. Monday, another dry day as the ridge and high pressure over the region slowly pushes east. Some high clouds will advance north into the area later in the day out ahead of an approaching low pressure system, and some diurnal cumulus will likely develop again inland from the lakes. Highs will range from the low to mid 80s for the lower elevations to the upper 70s for higher terrain. Local lake breeze circulations will keep the lakeshores in the 70s. && .SHORT TERM /TONIGHT THROUGH WEDNESDAY NIGHT/... Deep-layer ridging still draped across our region Monday night will withdraw southeastward into the western Atlantic through midweek. Meanwhile a subtropical/tropical low near the Carolina coast Monday evening will push inland and weaken Monday night and Tuesday...with the remnant broad mid/upper level circulation from this feature then continuing to push northwestward to the central Appalachians/Upper Ohio Valley through the end of the period. The slowly departing ridge will maintain fair dry weather across our region through Monday night...with just a gradual south-to-north increase in mid and high clouds anticipated well out ahead of the aforementioned coastal system. Thereafter...increasing/deepening southeasterly flow in between the advancing low and departing ridge will advect increasing amounts of Atlantic moisture into our region through midweek...bringing a general increase in cloud cover and eventually some shower chances. With nature yet to really show its hand with respect to how much subtropical/tropical development of this system will occur before it moves inland...the various guidance packages rather unsurprisingly continue to struggle with its track/speed/strength...and consequently the timing and placement of any associated showers. With this in mind have continued to lean more heavily toward a mix of continuity and blended guidance...and have just indicated a mix of 20-40 PoPs spreading across the area from south to north Tuesday afternoon through Wednesday for now. As for temperatures...these will still remain above normal given little to no change to our warmer-than-average airmass...though in general daytime highs should trend a little downward through midweek with the increasing cloud cover and shower potential...with these primarily ranging through the 70s by Wednesday. Meanwhile the increasing cloud cover will have the opposite effect on nightly lows...with these moderating to the upper 50s and lower 60s for both Tuesday and Wednesday nights. && .LONG TERM /THURSDAY THROUGH SUNDAY/... An upper level low over the Mid-Atlantic region will merge with a trough over the Northeast region Thursday through Friday. An anomalously strong ridge over the Mississippi Valley will move into Ohio Valley and Great Lakes region, replacing the trough as it exits to the east. Moisture will be somewhat pooled under a weakening upper level low across the Mid-Atlantic region into New York State Thursday. Surface high pressure will be centered near the Upper Great Lakes and extend into western and north central NY. Daytime heating and dewpoints in the 60s may result in the development of showers and a few thunderstorms Thursday afternoon through evening. Due to no obvious lifting mechanisms nearby, coverage looks scattered. Subsidence builds into the region Friday which will be mostly dry, however isolated to scattered showers remain possible inland from the lakes. A 585dm ridge will move into the region Saturday and Sunday, with medium to high confidence of another warm and dry weekend. Above normal temperatures will continue Wednesday through Saturday. && .AVIATION /06Z MONDAY THROUGH FRIDAY/... Mainly VFR with light winds through the 06z TAF cycle as surface high pressure remains in control across the forecast area. As has been the case with the past several nights, the main exception will be MVFR and localized IFR vsbys in nocturnal fog. Confidence is highest in this developing in the river valleys of the Southern Tier and east of Lake Ontario. The vast majority of the IFR vsbys should stay away from the TAF sites, with perhaps the exception of KART through the predawn hours. KJHW should remain largely unaffected by the nearby valley fog. Once the fog burns off following sunrise later this morning, VFR conditions will be found areawide through the day. Diurnal cumulus with bases around 5kft are expected to develop in the afternoon while a low pressure system far to the south spreads high cirrus across the region. Additional river valley fog is expected to redevelop in the Southern Tier near the end of the 06z TAF cycle. Outlook... Tuesday...Mainly VFR. Tuesday night and Wednesday...Mainly VFR. A small chance of showers. Thursday and Friday...Mainly VFR. && .MARINE... High pressure will continue to dominate the weather pattern over the eastern Great Lakes early this week, with light winds and minimal wave action. Light synoptic scale winds will again allow local lake breeze circulations to develop Monday afternoon with onshore winds of 5-10 knots in most areas. The pressure gradient will tighten a bit by Tuesday as a low pressure system slowly drifts northward from the Mid-Atlantic states. This will lead to a prevailing light to moderate east- northeasterly breeze on the lakes, which could result in a minor chop on the western end of Lake Ontario at times. This low pressure system could also bring a few showers to the lakes around midweek. && .BUF WATCHES/WARNINGS/ADVISORIES... NY...None. MARINE...None. && $$ SYNOPSIS...Hitchcock/PP NEAR TERM...Hitchcock/PP/SW SHORT TERM...JJR LONG TERM...HSK AVIATION...PP MARINE...Hitchcock/PP