Area Forecast Discussion
Issued by NWS Albany, NY
Issued by NWS Albany, NY
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913 FXUS61 KALY 090311 AFDALY AREA FORECAST DISCUSSION National Weather Service Albany NY 1111 PM EDT Wed May 8 2024 .SYNOPSIS... A cold front tracking through the region tonight will result in cooler weather tomorrow through the weekend. Chances for showers increase tomorrow afternoon and night through the weekend. It looks like we trend back towards drier and slightly warmer conditions for the beginning of next week before chances for showers increase again by midweek. && .NEAR TERM /UNTIL 6 AM THURSDAY MORNING/... As of 11 PM EDT...Our dew point boundary has already exited the region leaving us with much lower dew points that are now in the 40s to low 50s with the true cold front now pushing through the southern Adirondacks. Northerly winds also remain a bit breezy sustained around 5-10kts as the sfc pressure gradients tight. A few showers have developed along the boundary as it pushes south and eastward but these showers will diminish further as they exit the terrain given plenty of mid- level dry. While skies south of I-90 have cleared out, expecting clouds to redevelop after Midnight as winds gradually weaken and low- level moisture collects beneath the subsidence inversion. Given additional clouds expected overnight plus ongoing slightly breezy northerly winds, not expecting fog overnight. Forecast remains on track. Previous discussion...Tonight, the upper shortwave and associated surface low track from upstate NY off the New England coast. The system`s cold front will track through the region tonight, making it to around the I-84 corridor by 12z. Any areas ahead of the cold front could see some patchy fog tonight, especially for any areas that receive a shower/storm this afternoon. North and west of the cold front, advection of drier and cooler air should prevent much fog. Lows will range from the 40s for the high terrain to mid/upper 50s near the I-84 corridor. && .SHORT TERM /6 AM THURSDAY MORNING THROUGH FRIDAY NIGHT/... Tomorrow starts off relatively cool, especially across the northern portions of our forecast area. It will also be dry to start the day with a ridge of high pressure at the surface beneath confluent flow aloft extending over our region. However, a positively tilted upper trough with several embedded shortwave disturbances rotating around it dips into the Great Lakes region. The surface cold front continues its track southwards, and an area of low pressure tracks eastwards from the Ohio valley along the low-level thermal gradient beneath the left exit region of the upper jet. This will bring increasing shower chances in the afternoon and especially overnight, mainly for areas along and south of I-90. Precipitation does not look as widespread as it did at this time yesterday, especially tomorrow afternoon. If current forecast trends continue, PoPs may have to be trimmed back even more tomorrow. Temperatures will be in the 50s to 60s for highs tomorrow, and drop into the 40s tomorrow night. A few wet snowflakes could mix in across the southern Greens late tomorrow night, but little to no accumulation is expected. Friday and Friday night...Forecast confidence remains lower than we would like for this timeframe. The upper trough takes on a neutral to even negative tilt, and the surface low tracks to our south off the Mid-Atlantic coast. At the same time, an inverted trough will extend back north and west into central NY. We will likely see showers or a period of steady rain for areas near the inverted trough, but exactly how far north and east this feature and the associated precip makes it remains somewhat uncertain at this time. The best chance for rain therefore appears to be from Albany south and west. Here, likely to categorical PoPs were put in the forecast, with chance PoPs further north and east. Precipitation chances diminish Friday night as the surface low moves off to the east, but will keep slight chance to chance PoPs around with the upper trough axis moving overhead. Friday will be quite cool, with highs the 40s for many high terrain areas with 50s for the lower elevations. Friday night lows will generally be in the 40s, with some upper 30s in the high terrain areas. A couple wet snow flakes could mix in across the highest peaks of the ADKs, southern Greens, and Catskills with any lingering light showers. && .LONG TERM /SATURDAY THROUGH WEDNESDAY/... Long term period begins at 12z Saturday with another upper shortwave approaching from the west. This shortwave will close off aloft at it moves over our area, which will slow the forward progress of the large-scale trough causing it to remain overhead through most of the weekend. The surface low associated with the upper shortwave weakens as it moves into our area before redeveloping well or our east over the Atlantic. With the surface low and upper trough nearby all weekend, temperatures will likely be on the cool side, mainly in the 50s (terrain) to 60s (valleys). It will be mainly cloudy with chances for showers each day, although we will see scattered showers as opposed to an all-day rain. We may dry out Sunday night into Monday as upper confluence and a ridge of high pressure briefly build over the region, although an upper shortwave and associated cold front may bring additional chances for showers Monday afternoon into Tuesday for the norther half of our forecast area. The track of this feature is far from set in stone, so at this time till mention chance PoPs north of I-90 and work to refine the timing/location of any precip over the next few days. Forecast confidence decreases for the Tuesday into Wednesday timeframe, as another storm system will be developing upstream and may eventually track into our region towards the end of the long term period. Will mention chance PoPs Tuesday afternoon into Wednesday. Monday through Wednesday will be warmer, with more sun than over the weekend and a southerly component of the flow helping to advect warmer air into the region. && .AVIATION /03Z THURSDAY THROUGH MONDAY/... A cold front tracking through the terminals this evening has resulted in a brief period of strong northwest winds sustained up to 15-20kts and gusts up to 30-35kts with a few scattered showers mainly at GFL, ALB and ALB. Showers quickly diminish and winds weaken by 00 - 02 UTC in the wake of the boundary. Cold air advection continues the rest of tonight with ceilings gradually lowering and likely resulting in MVFR cigs at all terminals. GFL and PSF should see MVFR cigs first beginning at 03 - 06 UTC with ALB and POU following closer to sunrise by 09 - 12 UTC. Low-level moisture looks to remain pooled beneath the subsidence inversion through 15 UTC or so before winds shift to the north-northeast and high pressure builds into northern New England allowing for VFR conditions to resume. Clouds lower late in the TAF period mainly at POU and PSF as a warm front lifts from the mid-Atlantic northward but should only drop to low-end VFR. Additional showers also spread northward but mainly look to remain around POU with the rest of the terminals remaining dry through 00 UTC. Breezy northwesterly winds this evening sustained 5 - 15kts and gusts up to 20-30kts associated with the arrival of a cold front will weaken by 02 - 03 UTC. Northwesterly winds shift to the north-northwest overnight and remain sustained around 5-7kts. Northerly or north-northeasterly winds continue through the end of the TAF period and remain sustained around 5-8kts. Outlook... Thursday Night: High Operational Impact. Likely SHRA. Friday: High Operational Impact. Likely SHRA. Friday Night: Moderate Operational Impact. Chance of SHRA. Saturday: Moderate Operational Impact. Chance of SHRA. Saturday Night: Moderate Operational Impact. Chance of SHRA. Sunday: Moderate Operational Impact. Chance of SHRA. Sunday Night: Low Operational Impact. NO SIG WX. Monday: Low Operational Impact. Slight Chance of SHRA. && .ALY WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. MA...None. VT...None. && $$ SYNOPSIS...Main/Speciale NEAR TERM...Main/Speciale SHORT TERM...Main LONG TERM...Main AVIATION...Speciale