Area Forecast Discussion
Issued by NWS Albany, NY

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000 FXUS61 KALY 230603 AFDALY AREA FORECAST DISCUSSION National Weather Service Albany NY 203 AM EDT Wed Jun 23 2021 .SYNOPSIS... High pressure will ridge into the region from the southwest tonight through Thursday, bringing fair conditions and a warming trend with temperatures. Below normal temperatures are expected through Wednesday, warming closer to normal for Thursday into Friday. && .NEAR TERM /UNTIL 6 AM THIS MORNING/... As of 138 AM EDT...IR satellite imagery shows that the back edge of widespread cloud cover is now located over western New England. This will continue to move eastward overnight, allowing for clearing to finally occur across these eastern areas that have remained fairly cloudy. Elsewhere, skies are already mainly clear, although some patchy lower clouds are occurring over parts of the Adirondacks. Through the late night hours, skies will be clear/mostly clear with just some patchy stratocu in some northern/western areas. With light/calm winds in place, temps will continue to steadily fall through sunrise. Most places will have lows in the mid to upper 40s, although some upper 30s to low 40s are possible for the high terrain of the Adirondacks and Catskills. Although this is below normal for late June, temps should remain just warm enough to avoid any frost formation. Some patchy fog may form in some river valley areas, especially across the Adirondacks and into southern Vermont. && .SHORT TERM /6 AM THIS MORNING THROUGH THURSDAY NIGHT/... Upper level trough and attendant mid/upper level cold pool across the Great Lakes gradually lifts northeastward during Wednesday. The cold air aloft may allow some clouds to develop late Wednesday morning into the afternoon for areas mainly north of I-90. In fact, can not rule out an isolated shower/sprinkle across some higher terrain areas across the southern Adirondacks and southern VT, however overall coverage should be very limited. Otherwise, more sunshine is expected in valley areas, and most areas south of I-90. Max temps should reach 70-75 in valleys, and 60s for most higher terrain areas. West/northwest winds may gust up to 20-25 mph in portions of the Mohawk Valley/Capital Region and Berkshires in the late afternoon during peak mixing. Cool again for Wednesday night, with mainly clear skies and low temps mainly in the 40s except for some upper 30s across portions of the SW Adirondacks. Patchy fog could form within some river valleys. Mostly sunny and slightly warmer for Thursday, with highs 75-80 in valleys and 70-75 for most higher elevations. Mainly clear and slightly milder for Thursday night, with lows in the 40s to lower 50s. && .LONG TERM /FRIDAY THROUGH TUESDAY/... For the first full weekend of summer 2021, it does appear more summer-like weather is in the forecast. Of interest remains the building north Atlantic ridge (some discrepancy on placement per the global models) which attempts to retrograde through the long term period. As per previous couple of discussions, both entrainment of moisture from the Gulf of Mexico and Atlantic will converge across the eastern third of the CONUS. Warmer and more humid air mass remains higher confidence into the long term period. While the Atlantic ridge attempts to build westward, of more interest is what is forecast across the center of the nation. Global models all point toward a digging trough across the Mississippi River Valley with waves of short waves riding northeastward. As these waves track along the upstream trough axis and surface boundaries, chances of convection increase. Afternoon and evening hours will likely have the better probabilities for thunderstorms with showers overnight and during the morning hours. If the latest ensemble NAEFS are correct, we could see a little lower PoPs as the Atlantic ridge builds a little more westward. Temperatures through the period climb back into the 80s for most areas and overnight lows moderate through the 60s to around 70F for valley locations toward the end of this long term forecast period. PWATs are expected to steadily climb in excess of 1.50" with values approaching 2.00" for our northwest half of the CWA into the weekend. && .AVIATION /06Z WEDNESDAY THROUGH SUNDAY/...
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High pressure will build in at the surface while heights rise aloft through the TAF period; 06Z/Thursday. Skies have become mostly clear with some mid-level clouds moving through. The question is will fog and/or stratus form overnight. The development of fog is possible at KGFL while stratus and fog are possible at KPSF. Any fog and stratus will burn off quickly, otherwise VFR conditions are expected. Some fair weather cumulus will develop during the day Wednesday. Very light westerly to calm winds overnight. Westerly winds at 5 to 10 knots Wednesday. Outlook... Wednesday Night: No Operational Impact. NO SIG WX. 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: Low Operational Impact. NO SIG WX. Saturday: Moderate Operational Impact. Breezy. Chance of SHRA...TSRA. Saturday Night: Moderate Operational Impact. Chance of SHRA. Sunday: Low Operational Impact. Slight Chance of SHRA...TSRA.
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&& .FIRE WEATHER... High pressure will build into the region from the southwest overnight through Thursday, bringing fair conditions. Below normal temperatures are expected through Wednesday, warming closer to normal for Thursday into Friday. RH will recover to 90-100 percent tonight with areas of dew formation possible. RH will then drop to 30-40 percent Wednesday afternoon. Winds will be west to northwest tonight into Wednesday at 5-15 mph, with a few gusts up to 20-25 mph possible Wednesday afternoon within portions of the Mohawk Valley/Capital Region and Berkshires. && .HYDROLOGY... Generally dry conditions are expected tonight through Friday, allowing any small river rises to fall once again. Chances for showers and thunderstorms increase for Saturday and Sunday, especially across the southern Adirondacks. For details on specific area rivers and lakes, including observed and forecast river stages and lake elevations, please visit the Advanced Hydrologic Prediction Service /AHPS/ graphs on our website. && .ALY WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. MA...None. VT...None. && $$ SYNOPSIS...KL/Wasula NEAR TERM...Frugis SHORT TERM...KL LONG TERM...BGM AVIATION...IAA FIRE WEATHER...IAA/KL HYDROLOGY...IAA/KL is the U.S. government's official web portal to all federal, state and local government web resources and services.