Sunshine and quieter weather are settling back over the Finger Lakes and Central New York on Thursday as high pressure builds into the eastern Great Lakes, opening a stretch of dry weather that should hold through Saturday before the next round of showers and thunderstorms returns later in the weekend.
The change comes after a cool midweek pattern left some areas with clouds and spotty showers, and it starts with a notably cool Thursday morning in parts of the region. The National Weather Service said lows dipped into the low to mid-50s on the lake plains, with some Southern Tier valleys and other sheltered spots falling into the 40s before temperatures recover this afternoon.
Thursday turns brighter
Thursday is shaping up as the coolest afternoon in the short-term forecast, but it also looks like the start of the most stable period in the next several days.
Across lower elevations, temperatures are expected to recover into the mid to upper 70s by afternoon, while higher terrain should stay closer to 70 degrees. The cooler start and the incoming drier air should help keep humidity manageable through the day, even as skies continue to clear from west to east.
The clearest early differences across the region are likely to show up around daybreak. The Binghamton forecast office said patchy valley fog could form across the Twin Tiers of New York and Pennsylvania and linger through sunrise, with the best chance in the usual river and valley locations near the Southern Tier. That signal fades quickly after sunrise, and the broader daytime forecast across the Finger Lakes and Central New York is for dry, seasonable weather under light winds.
By Thursday night, high pressure will be centered more firmly over the region. That should keep skies mainly clear and winds light again, allowing another cool night to develop. Patchy fog may return late at night into early Friday in the deeper valleys, but the wider pattern remains quiet.
Friday and Saturday warm up
The larger story heading into the end of the workweek is not a storm system but a steady rebound in temperatures.
Forecasters expect the dry pattern to continue Friday as high pressure lingers from the eastern Great Lakes into New England. With more sunshine and weak warm advection in place, highs should climb into the lower 80s across many lower-elevation communities, while hilltops and higher terrain stay a little cooler. Morning fog may still show up in the Southern Tier valleys before burning off.
That warmer trend continues Saturday, when many lower elevations are expected to reach the mid-80s. The air mass does not look excessively humid or unstable through most of the day, and both forecast offices describe Saturday as part of the same quiet stretch that closes out the week.
For the Finger Lakes, that likely means a broad run of usable weather from Rochester’s eastern suburbs through Ontario, Seneca, Yates and Cayuga counties and east toward Syracuse, with the usual small-scale differences between lake-influenced areas and inland valleys. Communities south of the Thruway corridor and across the higher terrain should still run a bit cooler at times, especially early in the day, but the overall pattern favors sun, dry conditions and a midsummer warmup rather than disruptive weather.
The quiet pattern does not look fragile on Friday or Saturday. Neither the Buffalo nor Binghamton discussions signal organized rain during that stretch, which raises confidence that most of the region will stay dry heading into the second half of the weekend.
Sunday brings the next change
The forecast begins to loosen up again Sunday as the next upper-level trough digs toward the Great Lakes and Northeast.
That change is not expected to produce an all-day washout, but it does reintroduce scattered shower and thunderstorm chances, especially during the afternoon. The Buffalo office says Sunday should bring at least a chance of scattered showers and thunderstorms across western and north-central New York, while Binghamton forecasters also point to Sunday as the start of a more active stretch.
Temperatures Sunday should stay seasonable to warm, generally in the 80s across much of the Finger Lakes and Central New York. What changes more than the temperatures is the pattern overhead, with enough moisture and lift returning to put rain and storm chances back into the regional forecast.
At this point, forecast confidence is stronger on the broad turn toward unsettled weather than on the exact timing or coverage of individual storms. That matters for places such as Ithaca, Elmira, Auburn, Geneva and Syracuse, where the difference between a dry first half of the day and earlier storm development could affect how much of Sunday stays quiet before showers start to fill in.
Early next week stays more active
The same broader pattern is expected to linger into early next week, keeping scattered showers and thunderstorms in play beyond Sunday.
The Binghamton discussion notes that the atmosphere may have a few ingredients for storms during the early week, including modest instability, increasing shear and precipitable water values around 1 to 1.5 inches. Even so, forecasters also stressed that those values look lower than what the region has seen in some of the more active stretches earlier this summer.
That keeps the early-week message relatively measured. The pattern looks more active than the one in place from Thursday through Saturday, but it does not yet support an aggressive signal for widespread severe weather. Instead, the current forecast supports a period where passing showers and scattered thunderstorms become more common again, with any stronger cells capable of brief heavier rain, gusty winds and lightning.
Temperatures through early next week are expected to remain seasonable rather than extreme, which means the main weather story after Saturday shifts away from heat and back toward periodic storm chances. If later forecast packages sharpen the timing of those disturbances, confidence will improve on which part of Sunday or Monday carries the better chance for rain across the Finger Lakes, Central New York and nearby Southern Tier communities.
Check the latest forecast at the FingerLakes1.com Weather Center.
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