Area Forecast Discussion
Issued by NWS Buffalo, NY

Home |  Current Version |  Previous Version |  Text Only |  Print | Product List |  Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
-- Remove Highlighting --
-- Discussion containing changed information from previous version are highlighted. --
443 FXUS61 KBUF 111739 AFDBUF Area Forecast Discussion National Weather Service Buffalo NY 139 PM EDT Tue Jun 11 2024 .SYNOPSIS...
-- Changed Discussion --
Extensive cloud cover across the region will gradually erode through this evening. High pressure will build across the region, bringing dry weather which will last tonight through most of Thursday. A cold front will bring another round of showers and scattered thunderstorms Thursday night through a portion of Friday.
-- End Changed Discussion --
&& .NEAR TERM /THROUGH WEDNESDAY NIGHT/...
-- Changed Discussion --
A deep mid level trough will continue to move slowly east across New England tonight. A moist cyclonic flow on the western flank of the trough will persist across the eastern Great Lakes this afternoon. As this trough moves further away, the cloud cover will gradually erode through this evening. Mostly cloudy and cool weather early this afternoon, with some warming where the sun breaks out late afternoon and evening. Afternoon temperatures will be well below normal, only topping out 60 to 65F. High pressure will build over the eastern Great Lakes tonight. This will clear out the low clouds, although some mid-level clouds will enter Western NY late tonight. The clearing will allow some patchy fog to develop in the Southern Tier river valleys overnight. Light winds will also allow for good radiational cooling when skies are clear, with lows ranging from the mid 40s to lower 50s. Surface high pressure will build across the region Wednesday and Wednesday night, resulting in dry weather. A band of mid-level clouds will move from west to east across the area Wednesday, but outside of this skies will be mostly clear. It`ll also be warmer during the day Wednesday, with highs in the lower to mid 70s. This is near normal for mid-June.
-- End Changed Discussion --
&& .SHORT TERM /THURSDAY THROUGH FRIDAY/...
-- Changed Discussion --
Conditions will begin to deteriorate later Thursday afternoon as the flow aloft becomes nearly zonal out ahead of the next low pressure system. This will be forced by a mid-level trough pivoting across the Great Lakes from southern MB/ON provinces. Weak leading shortwave energy is expected to ripple through the zonal flow over the Northeast, which combined with growing diurnal instability will lead to additional clouds and possibly a few showers or an isolated tstorm, mainly over and in the vicinity of Lake Ontario where synoptic moisture will be slightly deeper. Otherwise, a briefly tightening pressure gradient over the region will lead to a breezier day east/northeast of the lakes as afternoon temps across the area top out in the low to mid 80s. Broad surface low pressure ahead of the shortwave to the north will lift northeast from eastern Ontario to central Quebec Thursday night while deepening to near 990mb. The system`s trailing cold front will sag southward through the eastern Great Lakes, leading to greater chances for showers across the region overnight into Friday morning. While the 00z suite of model guidance has come into better agreement on a sharper parent shortwave and the arrival time of the initial front, there remains greater forecast uncertainty in regards to shower coverage and QPF overnight and on Friday as remnant moisture from earlier convection moving east across the Ohio Valley potentially interacts with the pre-frontal wave. At this juncture, greatest chances for showers looks to be across the North Country Thursday night in closer proximity to the surface low though depending on how the aforementioned convection evolves, more widespread showers could move through the Southern Tier overnight. Outside of a spot shower or two, mainly dry weather should arrive across the western zones by the afternoon. For temperatures, the ushering in of the cooler overhead airmass should knock highs temps back into the 70s Friday.
-- End Changed Discussion --
&& .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... Any showers or thunderstorms associated with the earlier frontal passage on Friday should be well south and east of the area by Friday night as the axis of the parent upper-level trough will quickly move east of the Great Lakes overnight. A large area of surface high pressure and subsidence drying under a building ridge aloft will expand east across the region through Saturday, then move off to New England Sunday before settling off the coastline by Monday. While there could be a few diurnal showers across the area Monday afternoon, this pattern will otherwise support mainly dry weather through the weekend. While shower potential remains uncertain, confidence is much higher in true summer`s heat building by early next week. Highs on Saturday in the 70s will warm to the upper 80s and low 90s by Monday as 850H temps are expected to reach or exceed +20C. Though beyond the scope of the 7-day forecast...The strong surface high is expected to remain off the coast through much of the week which should continue to support warmer than normal temperatures, as reflected well by CPC`s latest 6-10 and 8-14 temperature outlooks. && .AVIATION /17Z TUESDAY THROUGH SATURDAY/...
-- Changed Discussion --
A mid level low across New England will maintain a cool and cyclonic flow aloft here, resulting in some lingering MVFR stratus. This cloud cover will continue to erode this afternoon as the mid level low moves further away. Mainly VFR flight conditions by this evening as surface high pressure builds in. Some river valley fog may impact KJHW tonight, depending on how long it clears. After the stratus clear out, there will be a band of mid level clouds which moves across the area from west to east late tonight into Wednesday. VFR flight conditions on Wednesday. Outlook... Wednesday night and Thursday...VFR. Thursday night and Friday...VFR/MVFR. Showers and thunderstorms likely. Friday night through Sunday...VFR.
-- End Changed Discussion --
&& .MARINE...
-- Changed Discussion --
High pressure will build across the Eastern Great Lakes, resulting in light winds which will last through Wednesday night. A cold front will then move across the eastern Great Lakes late Thursday night and early Friday. Southwest winds will increase ahead of the front Thursday, with winds remaining elevated through Friday. This will bring choppy conditions to both lakes. High pressure will then build back across the waters with light winds and generally favorable boating conditions during the weekend.
-- End Changed Discussion --
&& .BUF WATCHES/WARNINGS/ADVISORIES... NY...None. MARINE...None. && $$ SYNOPSIS...Apffel/Hitchcock NEAR TERM...Apffel/Hitchcock SHORT TERM...PP LONG TERM...PP AVIATION...Apffel MARINE...Apffel