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Area Forecast Discussion
Issued by NWS Albany, NY
Issued by NWS Albany, NY
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535 FXUS61 KALY 301058 AFDALY AREA FORECAST DISCUSSION National Weather Service Albany NY 658 AM EDT Sun Jun 30 2024 .SYNOPSIS... A cold front will bring scattered showers and thunderstorms today, some of which could be strong to severe, mainly south and east of Albany. Monday will be cooler and less humid with isolated showers possible. Fair and warmer conditions return for Tuesday and Wednesday. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... .UPDATE..As of 645 AM EDT, cluster of showers and thunderstorms across northern/central Catskills slowly advancing east/southeast. Leading edge of showers already into SW Herkimer County. Latest SPC Mesoanalysis suggests MU CAPES of 1000-1500 J/kg across south central NY into the Catskills, decreasing to 500-1000 J/kg farther east into the Capital Region and areas east of the Hudson River. Expect thunderstorms across Otsego County to gradually weaken as they track into Schoharie County and eastern Catskills over the next 1-2 hours. However, they may still produce some gusty winds and heavy downpours across southern Schoharie County and western Greene County. Otherwise, this general area of showers/storms should decrease in areal coverage as it outruns the better instability reservoir to the south/southwest. Remnant outflow from these showers/storms may provide a focus for additional convective initiation later this morning, as discussed below. PREVIOUS [404 AM EDT]...As of 4 AM EDT, cluster of showers/thunderstorms across SW Adirondacks/western Mohawk Valley with some embedded stronger cells with gusty winds. This cluster should continue tracking east/southeast over the next 1-2 hours. Latest SPC Mesoanalysis suggests MU CAPES (mainly elevated) of ~1000-1500 J/kg for areas west of the Hudson River. Showers/storms should move across the remainder of the Mohawk Valley, Lake George/Saratoga region over the next 1-2 hours, and northern portions of the Capital Region. Eventually, these showers/storms should weaken around/shortly after sunrise. However, lingering outflow may become initiation for additional convection later this morning across the Capital Region. Schoharie County and southern VT, which should then track east/southeast and strengthen upon reaching areas south of I-90, where MU CAPES may reach 2000+ J/kg within an area of 0-6 km shear of 40-45 KT. SPC has placed areas south/east of Albany, from southern VT/Berkshires southwest into the central/southern Taconics, SE Catskills, mid Hudson Valley and NW CT within a Slight Risk for severe T-storms due to these overlapping severe parameters. Scattered damaging wind gusts will be the main severe threat from these storms, although there remains a very low risk area for tornadoes across western New England extending into eastern portions of the mid Hudson Valley, where low LCL`s and greater low level shear will exist. Main cold front will then track southeast this afternoon, and could trigger additional isolated/scattered showers/thunderstorms, however there remains uncertainty how much recovery there might be from any earlier storms. Any thunderstorms could contain torrential downpours today given PWAT`s 1.50-1.75" and some possibility for training/backbuilding of cells. High temperatures should reach the lower/mid 80s in many valley areas today, and possibly the upper 80s across portions of the mid Hudson Valley, where heat indices could briefly reach the mid 90s before cooling from thunderstorms occurs. && .SHORT TERM /6 PM THIS EVENING THROUGH TUESDAY NIGHT/... Any lingering showers/thunderstorms should taper off this evening across the mid Hudson Valley and NW CT. Additional isolated/scattered showers may develop later tonight as upper level trough approaches. Elsewhere, partly to mostly cloudy and turning less humid with low temps mainly in the 50s. Upper level trough will traverse the region Monday, and may produce isolated showers, especially for areas east of the Hudson River. There could be enough instability for some thunder within the tallest convective elements. Otherwise, it will become breezy and less humid, with max temps mainly in the 70s in valley areas and 65-70 across higher terrain areas. Mainly clear and quite cool Monday night, with low temps in the upper 40s to lower/mid 50s for most areas. Some portions of the southern Adirondacks could drop into the upper 30s to lower 40s. Mostly sunny and warmer for Tuesday, with partly cloudy skies and milder temps Tuesday night. Highs Tuesday rebounding into the lower/mid 80s for lower elevations and mid/upper 70s across higher terrain. Lows Tuesday night in the mid 50s to lower 60s. && .LONG TERM /WEDNESDAY THROUGH SATURDAY/... High pressure will be centered off the New England coast as southerly return flow resumes across the region. A warm front will lift northward across the area. The best forcing will remain to our north and west so another dry day is expected. Highs will rise into the lower to mid-80s across the valleys and mid to upper 70s across the higher elevations with continued comfortable humidity levels. A cold front associated with an area of low pressure tracking well northward into Quebec will slowly cross the region Wednesday night into Thursday, Independence Day. Showers and a few thunderstorms will likely accompany the front during this time. Instability looks rather weak so the severe weather threat looks low at this time. Precipitable water values may increase to over 1.50 inches, so some heavy downpours are possible. Will monitor trends over the coming days. Otherwise, it looks to be a very warm and humid day for July Fourth with highs reaching the mid to upper 80s across many valley areas with some lower 90s across the mid-Hudson Valley (upper 70s to lower 80s in the higher elevations). The front looks to lift back northward as a warm front Friday into next weekend as another upper trough approaches from the west. This will keep a chance for showers and thunderstorms around each day for the rest of the long term period. && .AVIATION /12Z SUNDAY THROUGH THURSDAY/... Through 12z/Mon...Cigs will trend to VFR this morning along with mainly dry weather. Showers west of KALB are expected to dissipate before arriving later this morning. Even if they do arrive, no restrictions to cigs or vsbys are expected. A round of showers and thunderstorms will redevelop this afternoon and track eastward, mainly affecting KALB/KPOU/KPSF. Best thunderstorm chances are at KPOU/KPSF where TEMPOS for thunderstorms were included between 17- 20z/Sun. Only a shower TEMPO was included at KALB. IFR/MVFR conditions are possible in any shower or thunderstorm this afternoon. Strong winds are possible in any thunderstorm at KPOU. It is also possible a second line of showers and thunderstorms passes through KPOU after 20z/Sun, but will only include a VCSH for then and allow later TAF issuances make adjustments if needed. Showers will end and clouds will briefly decrease in coverage before patchy low clouds develop overnight along with an isolated shower mainly near KGFL. KPSF is most favored for MVFR cigs. Will leave all other TAF sites SCT for now due to lower confidence. Wind will become south to southwesterly at 10-15 kt with a few higher gusts to around 25 kt, then shift west to northwesterly this afternoon and evening at similar speeds. Wind will become northerly at around 10 kt overnight. Outlook... Monday Night: No Operational Impact. NO SIG WX. Tuesday: No Operational Impact. NO SIG WX. Tuesday Night: No Operational Impact. NO SIG WX. Wednesday: No Operational Impact. NO SIG WX. Wednesday Night: Moderate Operational Impact. Chance of SHRA...TSRA. Independence Day: Low Operational Impact. Slight Chance of SHRA...TSRA. && .HYDROLOGY... Abundant moisture (PWAT`s 1.5-2 inches, especially areas south/east of Albany) and relatively warm cloud depths will promote efficient rainfall rates in showers and thunderstorms today. Rainfall rates could reach or exceed one inch/hour within thunderstorms, especially south and east of Albany this afternoon. Localized flooding of urban, low lying and poor drainage areas will be possible where thunderstorms occur. Isolated flash flooding is also possible where multiple heavy downpours occur. && .ALY WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. MA...None. VT...None. && $$ SYNOPSIS...SND/KL NEAR TERM...KL SHORT TERM...KL LONG TERM...Rathbun AVIATION...Rathbun HYDROLOGY...SND/KL