075 FXUS61 KBUF 230640 AFDBUFArea Forecast Discussion National Weather Service Buffalo NY 240 AM EDT Tue Sep 23 2025
.SYNOPSIS... A slow moving trough of low pressure will bring beneficial rain to the region through mid-week, with several rounds of showers and scattered thunderstorms. Another low pressure system will move into the Great Lakes late in the week, with additional rain chances in an unsettled pattern.
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.NEAR TERM /THROUGH TONIGHT/... A mid-level shortwave trough will move across western and central NY this morning. Modest forcing combined with PWATS around 1.75" will support showers across forecast area. A cluster of heavier showers is expected to move into north-central NY early this morning.
An upper level low will spin over the Upper Great Lakes through tonight. A southwest flow will continue to supply the eastern Great Lakes with deep moisture. A southwest to northeast oriented moisture axis will persist from northwest Pennsylvania to central NY today and be a focus for additional showers and thunderstorms. Weak subsidence will build into western NY behind the exiting shortwave trough and widespread showers will taper off from west to east, especially across western NY through this morning. Daytime heating and moisture will support weak surface based instability inland from the lake shadows, and additional showers and thunderstorms are possible this afternoon. Average rainfall amounts will range from 0.25-0.50" across interior portions of the western Southern Tier to the southern Tug Hill region. Rainfall amounts will taper off further north, with the exception of where showers and possibly a thunderstorm develop along lake breezes. Higher amounts possible in thunderstorms.
Weak ridging will move into the forecast area tonight. Widely scattered showers are possible this evening, before mostly dry conditions continue overnight. Areas of fog are expected to develop across the forecast area tonight. Higher confidence of fog development is across the higher terrain and southeast of Lake Ontario.
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.SHORT TERM /WEDNESDAY THROUGH FRIDAY NIGHT/... A closed low over the upper Great Lakes will ever so slowly churn east and southeast towards the region. Meanwhile, shortwave energy ejecting out of the Bridger-Teton and Unitas mountain range will quickly track eastward and begin to interact with this closed low. As this interaction occurs, a sfc low tracking across the mid- Mississippi valley is advertised to strengthen as it nears the Ohio Valley late Wednesday. Increasing moisture (PW surging to 1.7") and lift ahead of the low will potentially bring the next round of showers and storms by late Wednesday afternoon-evening which could even persist all the way through the day Friday. That being said, there still remains quite a bit of uncertainty in timing and also the degree of shower coverage. For what its worth...there appears to be a general trend towards drier weather as we move into Friday afternoon-night and into the weekend.
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.LONG TERM /SATURDAY THROUGH MONDAY/... Weak sfc high pressure over the region will deliver dry weather on Saturday. There is very weak moisture starved front that is advertised to move quickly through the Lower Lakes Saturday night. Sfc high pressure over the Ohio Valley rapidly builds east behind the front Sunday with dry weather continuing through Tuesday.
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.AVIATION /07Z TUESDAY THROUGH SATURDAY/... Widespread light showers within a very moist airmass will continue to support a mix of flight conditions across the region this morning. Overall, IFR/LIFR conditions are expected across the higher terrain and east of Lake Ontario, with MVFR/VFR across the Niagara Frontier into Rochester this morning. Flight conditions will slowly improve during daylight hours while showers linger across the Southern Tier and the North Country. Drier air will bring flight conditions to VFR quicker at KIAG, KBUF, and KROC Today. Additional showers and thunderstorms are expected to form inland from the lake shadows this afternoon, and may produce a brief period of IFR or below at KIAG, KBUF, or KROC. Confidence is low at this time.
Showers will taper off tonight with mostly dry weather expected across the region. Areas of fog are expected to develop which may produce IFR or below at TAF sites. Chances are medium to high at KJHW and KROC.
Outlook...
Wednesday...VFR/MVFR with scattered showers and isolated thunderstorms.
Thursday...MVFR/IFR with showers likely and a chance of thunderstorms.
Friday...VFR/MVFR with scattered showers.
Saturday...Mainly VFR.
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.MARINE... Light winds and calm waters are expected through tonight. A northeast wind will create a moderate chop on the waters starting Wednesday. There is a low chance of Small Craft Advisories through Friday.
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.BUF WATCHES/WARNINGS/ADVISORIES... NY...None. MARINE...None.
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SYNOPSIS...Hitchcock/TMA NEAR TERM...HSK SHORT TERM...AR LONG TERM...AR AVIATION...HSK MARINE...HSK
NWS BUF Office Area Forecast Discussion