Area Forecast Discussion
Issued by NWS Albany, NY
Issued by NWS Albany, NY
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209 FXUS61 KALY 190601 AFDALY AREA FORECAST DISCUSSION National Weather Service Albany NY 201 AM EDT Wed Jun 19 2024 .SYNOPSIS... A dangerous combination of near-record heat and elevated humidity will continue through at least Thursday, especially at lower elevations. While much of the region will remain dry during this period, isolated to scattered showers and thunderstorms will be possible each afternoon. A modest respite from the heat will come in time for the weekend as a cold front approaches the region on Friday, although temperatures will nonetheless remain seasonably warm. && .NEAR TERM /UNTIL 6 AM THIS MORNING/... **Heat Advisories are now in effect across all of eastern New York and western New England through 8 PM Thursday** .UPDATE...As of 0200 AM EDT, mild and muggy conditions continue across the region as temperature remain stuck in the mid 60s to upper 70s. Cloud cover increasing from the west will allow for little in the way of additional cooling tonight, as temperatures slowly drop to early morning lows in the mid 60s to low 70s. With high humidity persisting, areas of valley fog are possible, most likely in portions of the southern Adirondacks and Upper Hudson Valley where temperatures have cooled the most so far tonight and where rain showers occurred earlier. Convection across western and central New York has largely dissipated, with only a few light showers tracking across the Finger Lakes region and little to no precipitation expected to region even the southwestern Adirondacks or western Mohawk Valley. Elsewhere, dry conditions are expected to continue. The forecast thus remains on track; see previous discussion below... .PREV DISCUSSION [1025 PM EDT]...Through tonight, the current 594 dam closed high currently spanning a large portion of the East Coast, including much of eastern New York and western New England, will look to amplify slightly as it tracks further north into the Northeast. With the loss of daytime heating, any showers and thunderstorms that have developed this afternoon will quickly die off yielding a dry but muggy night with low temperatures in the upper 60s to low 70s. && .SHORT TERM /6 AM THIS MORNING THROUGH FRIDAY/... **Heat Advisories continue through 8 PM Thursday for all of eastern New York and western New England** By tomorrow morning, the upper high looks to become centered over the Mid-Atlantic at about 597 dam. The amplification, though modest, will ensure 850 mb temperatures increasing to near 20C in most valley areas and about 18C at higher elevations. With forecast soundings indicating mixing up to 900 to 850 mb and the anomalously high upper-level ridging in place, high temperatures tomorrow will fair a few degrees warmer than today with mid/upper 80s anticipated above 1000 ft and mid to possibly upper 90s in valley areas. Dewpoints in the upper 60s to low 70s will make for dangerous heat indices of up to 95 degrees in mountainous areas and 95 to 104 degrees at lower elevations. Isolated heat index values of 105 degrees are possible in the Hudson Valley, but the lack of coverage, anticipated brevity of such conditions, and overall high confidence in remaining largely below 105 degree apparent temperatures warranted the continuation of the Heat Advisory instead of an upgrade to an Excessive Heat Warning. That`s not to say that this couldn`t change during the overnight period should new sources of guidance indicate a more widespread, longer duration of heat indices of 105 degrees or greater. However, with models having come to a strong consensus in temperatures remaining largely within the mid 90s with pockets of upper 90s in the Hudson Valley where these indices would be more common, it is looking less and less likely that such a product would be needed. It is important to note that the conditions forecast for tomorrow, though not meeting Excessive Heat criteria, are still incredibly dangerous if caution is not heeded. Drink plenty of water, limit time outdoors, and familiarize yourself with the signs and symptoms of heat illness. With dominating high pressure, conditions tomorrow will primarily be dry, though some isolated to scattered showers and thunderstorms will be possible as upper energy pulses about the northwestern periphery of the high. At this time, no severe thunderstorms are expected. Low temperatures tomorrow night will be similar to tonight with upper 60s to low 70s across the region. Thursday`s conditions will be fairly similar to tomorrow with the strength of the upper high remaining relatively stagnant. High temperatures will once again range from the mid/upper 80s to low/mid 90s with pockets of low 80s above 1500 ft. Heat index values will reach the low to mid 90s in high elevations with 95 to 104 degrees in valley areas. Therefore, the Heat Advisory will be allowed to persist through Thursday evening. Additional isolated to scattered showers and thunderstorms, some of which could become severe, are possible once again Thursday due to a surface trough tracking through the region. At this time, wind looks to be the primary threat with any severe storms that arise. Once daytime heating is lost Thursday night, showers and thunderstorms will taper off to yield another night of mid/upper 60s to low 70s. Though Friday will be warmer than typical mid-June standards, we will finally begin to get a respite to oppressive heat thanks to a surface cold front tracking through the region from northwest to southeast. Showers and thunderstorms will be possible across much of the region as a result of this boundary progression. Highs Friday will range from the upper 70s to upper 80s with pockets of low 90s in the lower Mid Hudson Valley. && .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... The extended forecast period begins with a frontal boundary stalling near the Pennsylvania and New York border with isolated to scattered showers and a few thunderstorms ending mainly south of Interstate 90. High pressure will be building in from southern Quebec and northern New England with a brief period of slightly cooler and drier weather to open the weekend. Lows will fall into the 50s to around 60F over the higher terrain Friday night with mid and upper 60s in the valleys. The frontal boundary will lift back north as a warm front Saturday afternoon into Saturday night. Some scattered showers and thunderstorms will develop along and near the boundary during the afternoon. Max temps will will run a little above normal with 70s to lower 80s over the higher terrain and mid and upper 80s in the valleys. The mid and upper level flow goes from zonal to southwesterly Saturday night into Sunday ahead of mid and upper level trough approaching from southern Ontario and the Great Lakes Region. The forecast area returns to a warm sector and the air mass become more humid and unstable. Lows Saturday night will be muggy in the 60s with a few upper 50s over the mountains. Sunday into Monday, a prefrontal trough may focus some bands or clusters of strong thunderstorms to close the weekend. The better low to mid level height falls and the cold front don`t move across the region until Sunday night into Monday. PWATS will run above normal, so some locally heavy rain may occur Sunday night into Monday. We kept PoPs in the likely to high chance range to close the weekend and open next week. Highs Monday may get into the mid 80s to around 90F in the valleys and upper 70s to lower 80s over the mtns. Lows Sunday night will be still sticky in the 60s to around 70F. The clouds and pcpn may keep may temps down a bit on Monday with 70s to lower/mid 80s. Some places in the Adirondacks may hold in the 60s. Monday night into Tuesday, high pressure builds into the area in the wake of the cold front with a brief respite potentially of slightly drier and pleasant early summer weather. Lows fall into the 50s to around 60F. Max temps will return slightly above normal for Tuesday. CPC`s Day 8 to 14 outlook for the last week of June into early July is calling for above normal temps and near normal pcpn across eastern NY and western New England. && .AVIATION /06Z WEDNESDAY THROUGH SUNDAY/... VFR conditions at ALB, PSF, and POU through 12 UTC while GFL will continue to vary between IFR and MVFR visibility due to foggy conditions after daytime rain yesterday and a muggy night. There will be instances of LIFR visibility but given uncertainty on exact duration of any LIFR visibility, we only show IFR visibility in the TEMPO group. If longer periods of LIFR vis are expected, we will make amendments. Fog at GFL dissipates by 10-12 UTC with VFR conditions mainly prevailing through the rest of the TAF period. The exception will be during any periods of isolated to widely scattered afternoon thunderstorms that develop. Highest chances for afternoon storms (mainly developing by 17 - 19 UTC through sunset) look to be for GFL which will be closer to the periphery of the broad upper level ridge and thus closer to the "ridge roller" activity. ALB and PSF could see some brief showers and storms as well but activity should be more isolated. We therefore included PROB30 groups at GFL, PSF, and ALB for the afternoon and show potential for MVFR visibility during any storms. POU should experience stronger subsidence and therefore storms are more unlikely. Any storms should dissipate by sunset. However, where storms can occur, fog may quickly develop towards or shortly after sunset given such a humid air mass staying in place. Included MVFR vis at GFL by 00 UTC/20 with potential for IFR vis/cigs given higher potential for this terminal to experience a storm but maintained VFR conditions for ALB and PSF where storm coverage is more isolated and less certain on exact placement. If storms occur at ALB and PSF, MVFR or even brief IFR vis will be possible after 00 UTC/20. Light and variable winds through 12 UTC except at ALB where sustained southeasterly winds remain around 5-7kts. Then, south to southwesterly winds become sustained 5-8kts at all terminal by 15 - 17 UTC. Brief strong wind gusts are possible during any thunderstorms this afternoon (17 - 23 UTC), especially during any stronger storms. Winds turn light and variable after 00 UTC/20. Outlook... Wednesday Night: No Operational Impact. NO SIG WX. Thursday: Moderate Operational Impact. Chance of SHRA...TSRA. Thursday Night: Low Operational Impact. Slight Chance of SHRA...TSRA. Friday: Moderate Operational Impact. Chance of SHRA...TSRA. Friday Night: Low Operational Impact. Slight Chance of SHRA...TSRA. Saturday: Moderate Operational Impact. Chance of SHRA...TSRA. Saturday Night: Moderate Operational Impact. Chance of SHRA...TSRA. Sunday: Moderate Operational Impact. Chance of SHRA...TSRA. && .CLIMATE... Record High Temperatures... Wednesday, June 19: Albany - 94 (1995) Glens Falls - 97 (1995) Poughkeepsie - 92 (1941, 1943, 1993, 2016) Thursday, June 20: Albany - 97 (1953) Glens Falls - 97 (1923) Poughkeepsie - 96 (2012) Friday, June 21: Albany - 97 (1938) Glens Falls - 96 (2012) Poughkeepsie - 97 (1949) Record High Minimum Temperatures... Wednesday, June 19: Albany - 71 (1976) Glens Falls - 67 (1905, 1949, 1976, 2017) Poughkeepsie - 73 (1993) Thursday, June 20: Albany - 73 (1893) Glens Falls - 68 (1964) Poughkeepsie - 71 (1931) Friday, June 21: Albany - 72 (1923) Glens Falls - 71 (1953) Poughkeepsie - 73 (1931) && .ALY WATCHES/WARNINGS/ADVISORIES... CT...Heat Advisory until 8 PM EDT Thursday for CTZ001-013. NY...Heat Advisory until 8 PM EDT Thursday for NYZ032-033-038>043- 047>054-058>061-063>066-082>084. MA...Heat Advisory until 8 PM EDT Thursday for MAZ001-025. VT...Heat Advisory until 8 PM EDT Thursday for VTZ013>015. && $$ SYNOPSIS...Gant/Picard NEAR TERM...Gant/Picard/Rathbun SHORT TERM...Gant LONG TERM...Wasula AVIATION...Speciale CLIMATE...Picard/Rathbun