Area Forecast Discussion
Issued by NWS Buffalo, NY

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369 FXUS61 KBUF 141428 AFDBUF Area Forecast Discussion National Weather Service Buffalo NY 1028 AM EDT Fri Jun 14 2024 .SYNOPSIS...
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The first of two cold fronts will move through the region this morning while producing a couple showers east of Rochester. A second reinforcing cold front will move through late this afternoon and evening with a shower or two across the North country. The weekend weather should be fantastic with fair dry weather comfortable conditions. Oppressive heat and humidity will then dominate our weather next week with dangerously high apparent temperatures...peaking in the upper 90s to low 100s Tuesday and Wednesday.
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&& .NEAR TERM /THROUGH SATURDAY/... A somewhat moisture starved cold front will complete its passage across our forecast area during the late morning and midday hours. While the majority of the region will experience partly to mostly skies in the process...there will still be a couple showers around...mainly east of Rochester. Otherwise...it should be delightful this afternoon with low humidity and temperatures that will mainly be in the 70s. A second...reinforcing cold front will slip across the North country late this afternoon and evening. This could result in a couple more showers for that area...otherwise expansive high pressure approaching from the Upper Great Lakes will provide us with moonlit skies and cool overnight lows in the upper 40s to mid 50s. The large area of high pressure will move directly over our region on Saturday. This will support sun filled skies...although it will be on the cool side of normal with afternoon temperatures only in the 60s to near 70. Enjoy this pleasant weather now...as dangerously oppressive heat and humidity is guaranteed for much of next week. && .SHORT TERM /SATURDAY NIGHT THROUGH SUNDAY NIGHT/... Superb weather for the weekend as an expansive ridge will build over the Great Lakes. This will keep the area dry, and outside of a few passing mid/high clouds Sunday, under mostly clear skies. As the surface ridge crests east of the region Sunday and moves off the East Coast by Sunday night, temps will get a boost into the mid/upper 70s, likely a few readings in the 80s across far western NY. Lows Saturday night will be rather chilly with a range of 40s across the interior and low 50s closer to the lakes. Warmer for Sunday night with a range of 60s across the region, possibly near 70 close to the Lake Erie shoreline. && .LONG TERM /MONDAY THROUGH THURSDAY/... ...Dangerous Heat Wave To Impact The Region Next Week... A very strong 500mb ridge will anchor itself across much of the eastern CONUS and western Atlantic through much of the week, which will dominate the sensible weather across the eastern Great Lakes. NAEFS ensemble guidance continues to indicate this ridge will be of anomalous strength with 500mb heights in the 99th percentile, if not exceeding the maximum climatological values for the Northeast for nearly the whole week. Latest runs of the deterministic ECMWF in particular continue to forecast overhead 500mb heights reaching 600dam, with coincident 850H temps near +24C at times. Deep anticyclonic flow around the resultant Bermuda High will cause hot, humid air to surge across the eastern CONUS. Given the strong signal from nearly all available long range guidance packages, confidence is high in a prolonged stretch of oppressive summer heat and humidity lasting through much of the week. Forecast thinking has not changed much from previous updates in regards to expected temps and heat indices next week. Daytime highs Monday will feature widespread upper 80s and lower 90s, remaining a bit cooler across the North Country in the upper 70s to mid 80s as slightly cooler airmass initially lingers in the region. By Tuesday and Wednesday, widespread high temperatures in the low to mid 90s are expected. Highest temps will be in the interior valleys, while cooler temps will be found just northeast of both lakes (including the Buffalo area) as a persistent southwest flow advects cooler marine air off the lakes. This heat comes as dewpoints climb into the low 70s, which will cause overall heat indicies in the afternoon to climb into the mid 90s to lower 100s. Temps are expected to be a few degrees lower on Thursday, back down into the upper 80s and low 90s. For context, daytime highs average the upper 70s for Buffalo, Rochester, and Watertown during the days of June 17-21. Even though heat indices will peak in the afternoon hours each day next week, nighttime will offer very little (if any) relief. Low temperatures from Monday night onwards are expected to only be in the low to mid 70s, with high humidity likely making for VERY muggy sleeping weather. Otherwise...The primary forecast uncertainty through much of next week continues to be on convective potential. Guidance continues to indicate a series of "ridge rider" showers and storms periodically cresting over the ridge and into the eastern Great Lakes region, the first batch of which could potentially arrive as early as Monday night. In addition, with dewpoints climbing into the upper 60s and low 70s, daytime surface based instability will likely be present each afternoon...Though the strong ridge should preclude much of the diurnal convective potential with strong capping expected to be in place. Given the low confidence in shower and storm timing and coverage, PoPs values remain on the low side (15-30%) through Thursday. && .AVIATION /15Z FRIDAY THROUGH TUESDAY/... While a cold front moving through the region could still allow for a shower east of Rochester through midday...VFR weather will be in place. The only exception will be across the Eastern Lake Ontario region where some MVFR cigs will be possible through midday. VFR weather with light winds will then be firmly ensconced across the region tonight through Saturday. Outlook... Sunday through Tuesday...VFR. && .MARINE...
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Westerly winds behind a front should remain below 15 knots today, before becoming more northerly and weakening tonight. High pressure will build back across the waters with light winds and generally favorable boating conditions during the weekend.
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&& .BUF WATCHES/WARNINGS/ADVISORIES... NY...None. MARINE...None. && $$ SYNOPSIS...RSH NEAR TERM...RSH SHORT TERM...PP LONG TERM...PP AVIATION...RSH MARINE...AR/RSH/TMA