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Area Forecast Discussion
Issued by NWS Buffalo, NY
Issued by NWS Buffalo, NY
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966 FXUS61 KBUF 121049 AFDBUF Area Forecast Discussion National Weather Service Buffalo NY 649 AM EDT Fri Jul 12 2024 .SYNOPSIS... As lingering moisture from the remnants of Beryl continues to thin out across the region this morning, areas of fog have developed across the Southern Tier and may develop across WNY. An area of high pressure will build across the region today and for the weekend supporting dry fair weather. Warm and moderately humid weather will return this weekend with highs ranging in the mid 80s to the low 90s. && .NEAR TERM /THROUGH SATURDAY/... With some clearing across WNY this morning from building high pressure in from the west, and lingering low level moisture from the exiting remnants of Beryl overhead of New England, areas of fog have developed across WNY, especially across the valleys of the Southern Tier. Aforementioned high pressure over the upper Great Lakes will continue to build east across throughout the rest of the day today and through through tonight, helping further clear out the remaining low level clouds across the eastern half of the forecast area and support fair dry weather. Today will be warmer due to the increased amounts of sunshine, with highs in the low to mid 80s. A shortwave trough will ripple across southern Ontario and Quebec Saturday with zonal flow setting up across the lower Great Lakes by Saturday night. Meanwhile at the surface, ridging across the Lower Great Lakes will support fair weather for the start of the weekend, with a few afternoon showers and storms possible well inland from both lakes. Temperatures and humidity levels will be on the rise creating warm sticky conditions Saturday. Highs Saturday will peak in the 80s with the warmest temperatures across the Genesee Valley and south of Lake Ontario. && .SHORT TERM /SATURDAY NIGHT THROUGH SUNDAY NIGHT/... High pressure surface and aloft builds firmly across the region Saturday night providing dry weather across the bulk of the area that will last through the second half of the weekend. Weak shortwave trough and associated surface warm frontal segment will then approach from the west late Sunday, then move across the region Sunday night. While there is an outside chance these features may produce a scattered shower or storm across far western NY by late in the day Sunday, the better chance for a few scattered showers/isolated rumble of thunder will be Sunday night as these elements move across western and northcentral NY. Not expecting too much in the way of coverage or rainfall as forcing and deeper moisture will be lacking. Otherwise, following lows mainly in the low to mid 60s Saturday night, it will be very warm Sunday with highs topping out in the mid and upper 80s for most, accompanied by our typical summertime humidity levels. Warmer and more humid airmass advects in across the region Sunday night, which will make for a fairly uncomfortable night for sleeping as lows only fall back into the upper 60s to low 70s for most, while dew point temps climb through the night. && .LONG TERM /MONDAY THROUGH THURSDAY/... More in the way of unsettled weather is expected to open the period as fast-moving successive weak shortwaves pass through broad upper level troughing across the Great Lakes and Northeast through the first half of the new work week. While these features could spark off a few scattered showers/storms at anytime as they pass through our area, increased instability owed to strong diurnal heating will be the key to better chances for showers and storms both Monday and Tuesday as again moisture and forcing with these features alone is not overly impressive. In other words, if any of these shortwaves crosses the area during the hours of peak heating, expect increased coverage of showers and storms. Very warm conditions will persist Monday and Tuesday with highs mainly in the 80s. Humidity will approach oppressive levels as dew points climb into the upper 60s and lower 70s. Long range model guidance is in fairly good agreement that a much more robust shortwave will then dive southeastward across the Great Lakes midweek helping to deepen the trough over the region, while also supporting a surface cold front that will cross the area during this time. Timing of the surface cold front at this point looks to be sometime Tuesday night into the first part of Wednesday, which will help to limit severe weather potential with the expected mainly nocturnal passage of the boundary. Expansive Canadian sourced surface high pressure centered over the northern Plains/upper Midwest is then expected to ridge across the lower Great Lakes in the wake of the fropa bringing pronounced drying for the latter part of the work week. The initial cold frontal passage will knock our temps down some for Wednesday, before a moisture starved secondary cold front pushes across the region opening the door to a much more refreshing airmass for the latter part of the work week. In terms of temperatures, expect highs mainly in the mid to upper 70s Wednesday with some relief in humidity levels. Highs Thursday may only be a couple degrees lower on the thermometer, however dew points solidly in the 50s will make it `feel` much more tolerable outside. && .AVIATION /12Z FRIDAY THROUGH TUESDAY/... Low level clouds have begun to clear across the western half of the forecast area this morning supporting mainly VFR conditions. However some lingering low level moisture, across the Southern Tier is supporting areas of valley fog this morning, causing visibilities at KJHW to drop to VLIFR. To the east, low level clouds remain in place supporting MVFR to IFR ceilings. As the morning progresses, dry air will continue to infiltrate across the area supporting all TAF sites to return to VFR by late morning/midday. VFR conditions will then last through tonight as high pressure lies overhead. Outlook... Saturday and Sunday...Mainly VFR. Just a slight chance for afternoon thunderstorms across parts of the Srn Tier and Finger Lakes region. Monday and Tuesday...VFR to MVFR cigs with scattered thunderstorms. && .MARINE... High pressure will continue to build east across the lower Great Lakes today relaxing the pressure gradient and supporting light winds and waves today. As high pressure remains overhead throughout the weekend, light winds and waves will persist. && .BUF WATCHES/WARNINGS/ADVISORIES... NY...None. MARINE...None. && $$ SYNOPSIS...EAJ NEAR TERM...EAJ SHORT TERM...JM LONG TERM...JM AVIATION...EAJ MARINE...EAJ