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Area Forecast Discussion
Issued by NWS Albany, NY
Issued by NWS Albany, NY
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984 FXUS61 KALY 251943 AFDALY AREA FORECAST DISCUSSION National Weather Service Albany NY 343 PM EDT Tue Jun 25 2024 .SYNOPSIS... A warm front will move across the area tonight, bringing widely scattered showers and perhaps a few thunderstorms. Warm and more humid conditions expected on Wednesday, then a cold front will bring more widespread showers and thunderstorms late Wednesday afternoon into Wednesday night. Cooler and drier weather will be ushered in for Thursday into Friday as high pressure builds in. && .NEAR TERM /THROUGH WEDNESDAY/... High level clouds continue to increase/thicken ahead of an upper level short wave and associated surface warm front approaching from the lower Great Lakes. Moisture will start to return as the warm front pushes through tonight, but since the air mass will be starting out dry, coverage of showers should only be isolated to widely scattered with the highest chances north/west of Albany. HREF indicating some limited elevated instability (MUCAPE < 250 J/Kg), so a few rumbles of thunder may occur in the W. Adirondacks. With the increasing clouds and a southerly breeze developing, lows will be mild ranging from the 60s to around 70. The warm front lifts north of our area on Wed, with a W-SW flow ushering in a somewhat more humid air mass. Dewpoints are expected to rise into the lower/mid 60s in most valley locations during the afternoon. 850 mb temperatures anomalies from the GEFS look to be +1 to +2 STDEV, so it will be warm with highs in the mid 80s to near 90 in lower elevations. A potent and progressive upper level trough and associated surface cold front will start to approach from the west late in the day. Based on the latest timing from the CAMs and global guidance, it appears that any shower and thunderstorm development will likely hold off until very late afternoon or early evening, so will only maintain 20-40% PoPs for areas well south/west of Albany through 6 PM. && .SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY/... The most active part of the period is expected to be Wed evening into Wed night, as the aforementioned upper trough/cold front track eastward across the region. A warm/moist air mass will be in place just ahead of this system. Strong forcing and sufficient moisture (PWAT anomalies of +1 to +2 STDEV) are expected to lead to numerous showers and thunderstorms. With evening into early overnight timing, the magnitude of instability looks rather limited, with SBCAPE (< 500 J/KG) across much of the area. The best overlap of just enough instability and shear for severe storms looks to be across southern portions of Ulster and Dutchess counties where there is a small area of a Slight Risk (level 2 of 5) outlook. There looks to be enough shear (0-6 km bulk shear of 40-50 kt) across the entire area for storm organization, but really only enough buoyancy to maintain sustained updrafts across these far southern counties. The main threat looks to be damaging wind gusts. The severe threat should be non-existent across the northern 2/3 of the area. There is a Marginal Risk (level 1 of 5) from Albany and the Berkshires south, which has been trimmed south compared to prior outlooks. Due to high PWATs, there will be embedded downpours which could lead urban/poor drainage flooding and isolated flash flooding where persistent or repeated downpours occur. There is a Marginal Risk (level 1 of 4) of excessive rainfall across the entire area. Showers and storms should start to taper off by ~1 to 3 AM from west to east as the disturbance and front move east. Cold advection begins late, which will result in low temperatures to drop to the mid 50s in the higher terrain to lower 60s in the Hudson Valley from around the Capital District south. Cooler/drier conditions in store for Thu, as high pressure builds eastward from the Great Lakes. There is just a low probability for a few morning showers across far northern areas. NW winds will gust to around 20-25 mph in favored areas, ushering in less humid conditions(dewpoints dropping into the 50s). High temperatures should be near normal ranging from upper 60s in the W. Adirondacks to lower 80s in the mid Hudson Valley. Thu night looks clear and cool with high pressure directly over the area. Clear skies, a dry air mass (PWAT anomalies of -1 to -2 STDEV) and light winds will lead to low temperatures below normal with 40s in the mountains to lower/mid 50s in the valleys. Dry/tranquil weather expected to persist Fri as high pressure shifts eastward into New England during the day. Highs may be a degree or two warmer than Thu, but overall temperatures will be near normal with continued low humidity levels. && .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... Active weather looks to return, as a warm front lifts northward across the region Fri night into early Sat, followed by a cold front passage Sat night into early Sun. Parameters lining up for potential strong to severe storms and localized flash flooding threat. GEFS already indicating anomalously strong SW winds and significant deep layer moisture (850mb v-component wind and PWAT anomalies of +2 to +3 STDEV) Sat to Sat night. Depending on timing of forcing from any pre-frontal surface trough and the cold front as well any significant disturbances aloft, will have to monitor trends for possible severe and/or flash flood hazards. Will continue mention of likely PoPs late Sat through Sat night, with scattered to numerous thunderstorms expected. The cold front should clear the area on Sun, with cooler/drier air starting to gradually filter in during the afternoon as winds become NW. With temperatures aloft still fairly warm, highs could reach well into the 80s across lower elevations although humidity levels should lower by later in the day. Will linger mention of chance PoPs into the day due to account for possible slower timing of the cold front passage and will refine further once the weekend gets closer. Good model consensus for a large area of high pressure building in early next week, with dry conditions, near normal temperatures and comfortable humidity levels. && .AVIATION /20Z TUESDAY THROUGH SUNDAY/... Through 18z Wednesday...VFR conditions are expected to prevail through the 24 hour TAF period. High level cirrus clouds will continue to increase this afternoon and thicken through this evening. Cigs will lower to 6000-10000 ft AGL overnight associated with a warm front moving through. Widely SCT -SHRA are possible, especially in the KALB-KGFL corridor, so will mention VCSH at these sites. Mid level clouds are expected to decrease after 12z Wednesday behind the warm front, with mainly FEW cumulus clouds and SCT high level cirrus clouds around. Added mention of low level wind shear at KPOU/KPSF from around 06z onward tonight due to just enough of a wind speed difference (30 kt difference) between the surface and 2000 ft AGL as a southwest jet of around 40 kt moves in. LLWS should dissipate after 12z once deeper mixing commences. Surface winds will be mainly west-southwest around 8-10 kt with occasional gusts to 15 kt through the daylight hours. Winds will become south-southwest around 3-6 kt this evening, increasing to 5-10 kt overnight. Outlook... Wednesday Night: High Operational Impact. Definite SHRA...TSRA. Thursday: Low Operational Impact. Breezy. NO SIG WX. Thursday Night: No Operational Impact. NO SIG WX. Friday: No Operational Impact. NO SIG WX. Friday Night: No Operational Impact. NO SIG WX. Saturday: Moderate Operational Impact. Breezy. Likely SHRA...TSRA. Saturday Night: High Operational Impact. Likely SHRA...TSRA. Sunday: Moderate Operational Impact. Chance of SHRA...TSRA. && .ALY WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. MA...None. VT...None. && $$ SYNOPSIS...JPV NEAR TERM...JPV SHORT TERM...JPV LONG TERM...JPV AVIATION...JPV