Area Forecast Discussion
Issued by NWS Buffalo, NY
Issued by NWS Buffalo, NY
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220 FXUS61 KBUF 010544 AFDBUF Area Forecast Discussion National Weather Service Buffalo NY 144 AM EDT Wed May 1 2024 .SYNOPSIS... High pressure will build in with fair and dry weather returning tonight through at least Friday morning. Meanwhile, temperatures will remain solidly above normal for the foreseeable future. && .NEAR TERM /THROUGH TONIGHT/... There`s a potential for widely scattered showers east of Lake Ontario (20% chance) with the passage of a weak secondary frontal boundary overnight. Otherwise, lots of low level moisture and a light flow aloft will maintain quite a bit of cloud cover across the region tonight. There also will be patchy fog both with the low moisture, and perhaps a bit more dense fog in any areas which clear out and have radiational fog develop. Lows will be in the mid 40s to lower 50s. Clearing Wednesday morning...as a progressive mid level shortwave ridge and associated weak sfc high will cross our forecast area. The fair dry weather on Wednesday will be accompanied by max temps that will range from the mid 60s across the Eastern Lake Ontario region to the low and mid 70s over the western counties. A compact shortwave will pass by to our north Wednesday night. This will drive a moisture starved cold front through our region. While there will be slgt to low chc pops near and east of Lake Ontario... the passage will be marked by nothing more than patchy clouds and subtle wind shift to mark the occasion. && .SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/... The period will start out mostly dry as a ridge builds into the region from the west on Thursday. There may be a few showers across the north country as weakening sfc low and trough pass by the area on Thursday morning. Dry weather is expected through most of Friday afternoon before an area of showers approaches from the west. A large occluding sfc low tracking northeast into western Ontario from the upper Midwest on Friday into Saturday will push a cold front toward the region late Friday. A new weaker sfc low will develop over the Tennessee/Ohio Valleys and track northeast along the cold front. Showers will increase from west to east later Friday into early Saturday as the cold front and secondary sfc low track toward the area, along with the warm front of the secondary sfc low. Some embedded thunderstorms will be possible as the warm sector with the sfc low moves over the region. Still some timing differences among guidance with slower guidance around 3 to 6 hours slower than some of the faster guidance. Rainfall through Saturday night should range from a few hundredths of an inch for the north country to a few tenths of an inch for far western NY. Temperatures during the period will warm to well above normal with highs on Thursday in the upper 50s to low 70s. Fridays high temperatures will reach at least 15 degrees above normal, warming into the mid 60s to near 80 for the day. Some uncertainty for Thursday temperatures as some guidance has come down a bit on maxT`s across the area, due to slower warm air advection, so made some adjustments down, but still a warm day. && .LONG TERM /SATURDAY THROUGH TUESDAY/... A vertically stack low pressure system located over NW Ontario Canada will slowly drag a cold through the eastern Great Lakes. Due to the slow progression of this front, and then a potential secondary front have kept low end PoPs across much the the forecast area into Sunday. We should see a fairly widespread area of rain Saturday move from west to east, which then gives way to chances for showers into Sunday. Brief surface high pressure builds into the Great Lakes Sunday night, causing any lingering showers to gradually deplete from west to east. Dry weather looks to persist through much of Monday but yet again another warm frontal boundary will begin to approach from the southwest. This will introduce a chance of shower either late Monday night or during the day Tuesday. Still some timing issues to work out but have once again added chance PoPs reflecting the front nearing and entering the region. Overall, temperatures will continue to remain above average through the weekend and into next week. && .AVIATION /06Z WEDNESDAY THROUGH SUNDAY/... Some lingering IFR cigs east of Lake Ontario overnight, but otherwise cigs have lifted or scattered across Western NY. However, this clearing has allowed radiation fog to develop in the Genesee Valley, impacting the ROC terminal. Low confidence in handling this fog which may mix out some with the passage of the weak frontal boundary, or it may not. Otherwise, satellite imagery shows an another area of low moisture and IFR cigs developing across southern Ontario province and Lake Ontario. This will expand overnight, lowering cigs and possibly resulting in some fog as well. Fog may be with the large area of low moisture, or radiation fog. On Wednesday...IFR to MVFR cigs in the morning will give way to VFR weather regionwide. Outlook... Thursday...VFR. Friday...Mainly VFR with a chance of afternoon showers and thunderstorms. Saturday...MVFR to VFR with showers likely and possible thunderstorms. Sunday...Morning showers otherwise mainly VFR weather. && .MARINE... A quiet week is expected on the lower Great Lakes as the pressure gradients remains weak. Winds will generally remain 15 knots or less. && .BUF WATCHES/WARNINGS/ADVISORIES... NY...None. MARINE...None. && $$ SYNOPSIS...Apffel/RSH NEAR TERM...Apffel/EAJ/RSH SHORT TERM...SW LONG TERM...AR AVIATION...Apffel/EAJ/RSH MARINE...Apffel/TMA