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Area Forecast Discussion
Issued by NWS Buffalo, NY
Issued by NWS Buffalo, NY
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402 FXUS61 KBUF 160513 AFDBUF Area Forecast Discussion National Weather Service Buffalo NY 113 AM EDT Tue Jul 16 2024 .SYNOPSIS... An unsettled pattern will continue through midweek...with another round of strong thunderstorms possible Tuesday. A cold front will sweep across the area midweek...with high pressure building across our area in its wake and providing mainly dry...cooler...and much less humid conditions for the second half of the week. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... An MCV is exiting east of the area, with just a few leftover scattered showers east of Lake Ontario. These showers will gradually end through the wee hours of the morning. Farther west, skies have cleared nicely across Western NY, Genesee Valley, and western Finger Lakes. It will be another sultry night with lows in the upper 60s to low 70s. During Tuesday the longwave upper-level trough will remain well upstream of the area over northwest Ontario. A weak low level trough axis will linger in place from the Ohio Valley to New England, with its position modulated by numerous rounds of convection and associated composite outflow. This feature will serve as the conduit for yet another convectively generated vorticity maxima/MCV that will move east across our region Tuesday, with this feature supporting another round of showers and thunderstorms that will cross the area from west to east. The 12z/15 suite of model guidance still suggests an earlier arrival of this next wave compared to today`s...though this is just a little bit slower than seen in last night`s guidance. Current timing takes this feature across western NY between the morning/midday hours, then the eastern Lake Ontario region/central New York early Tuesday afternoon. The earlier arrival of forcing, clouds, and showers relative to the diurnal cycle may act to limit potential instability across far western New York...with areas further south and east having a better opportunity for notable diurnal destabilization. Deep layer shear is not particularly strong (only around 30 knots) across western New York...however this looks to be greater with increasing northeastward extent - with this especially the case across the North Country where 0-6km bulk shear is currently projected to be in the 40 to 50 knot range. As is typically the case...the MCV will also likely bring a mesoscale region of enhanced low/mid level shear, convergence, and ascent as it crosses the region...thereby providing a more favorable environment for strong to severe storms. At this point strong damaging winds again appear likely to be the primary severe weather threat...along with a secondary risk for large hail. Additionally...the enhanced shear supplied by the MCV will also support a low but nonzero risk for an isolated tornado or two...with this risk likely greatest across the eastern Finger Lakes and North Country where the environmental shear currently looks to be highest. In the wake of the MCV, a few more showers and thunderstorms may develop along lake breeze driven convergence zones in the afternoon and evening, mainly from the Southern Tier through the Finger Lakes and Central NY. Increasing southwest flow off Lake Erie will likely produce a stable lake shadow northeast of the lake with mainly dry weather following the morning/midday convection. Otherwise it will be very warm and humid again Tuesday, with highs in the low 80s for Western NY and mid to upper 80s from the Genesee Valley into Central NY. While apparent temperatures could briefly tickle 95F from the Genesee Valley into Central NY, the brief/ marginal nature of these and the potential for clouds and convection to keep temperatures a few degrees lower both preclude the need for any Heat Advisories at this time. && .SHORT TERM /6 PM THIS EVENING THROUGH THURSDAY NIGHT/... Longwave trough will gradually work through the Great Lakes Tuesday night through Wednesday night, ending up in Quebec by Thursday morning. One or more convectively augmented shortwaves may cross NY/PA Tuesday night through Wednesday, supporting ongoing chances of a few showers and thunderstorms at times. Cold front will gradually settle southeast across the region late Wednesday afternoon, with chances of showers and thunderstorms ending from northwest to southeast late Wednesday through Wednesday night with the frontal passage. Drier and less humid air will arrive later Wednesday night in the wake of the cold front. High pressure will build in Thursday and Thursday night and result in a period of drier, less humid, and somewhat cooler weather. High temperatures Thursday in the 70s and lows Thursday night in the 50s. && .LONG TERM /FRIDAY THROUGH MONDAY/... It`s looking like this will be a stretch of spectacular weather across the region, with a broad ridge of high pressure building across the region. A weak cold front will drop southward across the region Sunday, but its passage should largely be rain-free with possibly an isolated shower. Otherwise, there`s good model agreement providing high confidence in rain-free weather. Temperatures will be near normal with daytime highs averaging in the mid 70s to lower 80s and nighttime lows mainly in the mid 50s to lower 60s. && .AVIATION /05Z TUESDAY THROUGH SATURDAY/... Scattered showers east of Lake Ontario will gradually taper off and end through the early morning hours. Areas of MVFR/IFR CIGS will persist east of Lake Ontario through early morning before scattering out by mid morning. Otherwise VFR will prevail for the rest of the area through mid morning. Another area of showers and thunderstorms associated with an upper level disturbance will arrive in Western NY by mid to late morning, then move east across the rest of the area, reaching the eastern Lake Ontario region by mid afternoon. This will bring a likelihood of thunder and brief VSBY/CIG reductions across much of the area, including all the terminals. Some storms may be strong with localized high wind gusts. Mainly VFR conditions will follow later today behind this round of showers and thunderstorms. A few more storms may develop late afternoon through evening from the Southern Tier into the Finger Lakes, mainly east of KJHW and south of KROC. Tonight, the evening showers and thunderstorms across the Southern Tier and Finger Lakes will taper off. Overnight, an approaching cold front and mid level trough may produce a few more showers and thunderstorms with uneven coverage. Areas of MVFR CIGS may develop later tonight as well. Outlook... Wednesday...VFR/MVFR with a chance of showers and thunderstorms. Thursday through Saturday...VFR. && .MARINE... In the wake of a passing disturbance, there will be a few hours of strong southwest winds...resulting in a brief period of small craft conditions on Lake Erie and the Upper Niagara River through this evening. Southwest flow will increase again late tonight through Tuesday, producing more notable chop on both lakes, with a period of Small Craft Advisory conditions on Lake Erie Tuesday following the passage of yet another disturbance. This second disturbance will also likely generate a another round of showers and storms across our region... with any stronger storms again capable of strong wind gusts and locally higher waves. Periodic chances for showers and thunderstorms will then continue across eastern Lake Erie and Lake Ontario through Wednesday, with the potential for locally higher winds and waves in and near any storms. && .BUF WATCHES/WARNINGS/ADVISORIES... NY...Beach Hazards Statement through late tonight for NYZ010-085. Beach Hazards Statement through this afternoon for NYZ019. MARINE...Small Craft Advisory until 11 PM EDT this evening for LEZ040- 041. && $$ SYNOPSIS...JM/JJR NEAR TERM...Apffel/Hitchcock/JJR SHORT TERM...Hitchcock/JJR/TMA LONG TERM...Apffel AVIATION...Hitchcock MARINE...Apffel/JM/JJR