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Forecast Discussion for New York City/Upton, NY
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153 FXUS61 KOKX 081818 AFDOKX Area Forecast Discussion National Weather Service New York NY 118 PM EST Thu Jan 8 2026 .WHAT HAS CHANGED... Less wind and cooler temperatures are now anticipated on Saturday in comparison to prior forecast cycles. Otherwise, the forecast remains on track. && .KEY MESSAGES... 1) Quiet & Dry under high pressure Thursday night into Friday morning. 2) Dual frontal systems bring a period of rainfall Friday afternoon through Saturday night along with above average temps. A few moderate to heavy downpours are possible Saturday, but flooding concerns remain minimal, at this time. The second system then exits with a cold front on Sunday. 3) A cold front will bring temperatures back down to near normal levels Sunday night into the middle of next week, however, temperatures will still remain above normal. && .DISCUSSION... .KEY MESSAGE 1... High pressure moves over the area tonight, exiting offshore tomorrow. This will keep things quiet and dry through tomorrow morning. Lows tonight still reach freezing in the interior and LI Pine Barrens under calm winds, but increasing cloud cover. .KEY MESSAGE 2... Heights rise aloft on Friday in response to upper-level ridging. They remain elevated aloft through Saturday night, aiding in warmer than average temperatures and keeping any precip as all liquid. Simultaneously, we`ll be impacted by two separate frontal systems. The first is a low pressure system over the Great Lakes on Friday associated with a shortwave aloft. This brings through a warm front on Friday leading to increasing temperatures and increasing moisture. Highs on Friday in the low 50s, then into the low 40s by Friday night. We`ll be located in an unfavorable synoptic setup in the right exit region of a jet streak on Friday, so probably only seeing isolated light showers and overcast skies until Friday night when the low exits into northeast Canada and drags through a cold front. This will likely bring a period of light showers until the front exits and stalls to our south by Saturday morning. This has trended notably later than in prior forecast cycles. A second frontal wave or broad area of low pressure will develop to our west and south and bring in more moisture and rainfall on Saturday into Saturday night. There may be a lull in precip on Saturday morning until it arrives Saturday afternoon, as most model guidance now keep Saturday morning dry. Precipitation will taper late Saturday night into Sunday morning as the low exits northeast with dry NW flow setting in. Rainfall may briefly become moderate to locally heavy, at times, Saturday into early Saturday night. Cyclonic flow from the surface low, frontal boundary lift, more favorable jet dynamics aloft, and PWATs exceeding 1" will help with this. However, the organization and placement of this frontal wave varies among guidance. If too far south, then drier, cooler air may lead to only lighter precipitation. This bears watching further. Regardless, flooding concerns remain minimal, at this time. Overall for the event, around 0.5-1.5" are expected across the area. Temperatures have trended cooler on Saturday along with lighter winds compared to prior forecast cycles. This is primarily due to low pressure now anticipated to move directly over the region rather tracking to our northwest which would have left us in a pressure gradient and warm-sectored. Highs will now be in the mid/low 40s on Saturday. Complex low pressure passes to the north Sunday with a secondary low deepening over the Canadian Maritimes late Sunday into Sunday night. A cold front with this complex low passes through the region Sunday, with a secondary cold front late Sunday into Sunday night with rain ending. .KEY MESSAGE 3... A secondary cold frontal passage Sunday night will bring the anomalously mild weather to an end as temperatures return to more seasonally normal levels Sunday night. However, temperatures will still be slightly above normal. Return flow develops Tuesday into Wednesday as high pressure moves off the southeastern coast ahead of another frontal system that tracks into the Great Lakes region and then into southeastern Canada. Temperatures will be around 5 degrees above normal Tuesday and Wednesday. && .AVIATION /18Z THURSDAY THROUGH TUESDAY/... High pressure remains in control through tonight. A frontal system approaches tomorrow. Mainly VFR through tomorrow morning. While not included in the TAFs, MVFR or lower categories possible in any low stratus or patchy fog prior to 15Z. MVFR cigs become likely after 18Z Friday with IFR cigs by 22-00Z. -RA possible 18-21Z, but more likely after 21Z. WNW-NW winds around 10kt diminish this afternoon, backing more W-WSW for some coastal terminals. Light and variable winds expected tonight before a shift to the S by the morning push with speeds around 10kt. Some gusts to 20kt are possible. ...NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty... A few gusts up to 20kt possible this afternoon and again tomorrow during the day. Chance that winds at KJFK become more southerly late in the day. .OUTLOOK FOR 18Z FRIDAY THROUGH TUESDAY... Friday: Rain likely, mainly in the afternoon and night. MVFR, lowering to IFR at night. S winds G20kt in the afternoon. LLWS also possible in the afternoon and evening. Saturday: Rain with IFR likely, MVFR possible. SE winds G15-20kt in the afternoon. LLWS possible along the coast in the evening. Sunday: Chance of rain and MVFR/IFR mainly in the morning. W winds G25-30kt. Monday: VFR. NW/W wind G20-25kt. Tuesday: VFR. Detailed information, including hourly TAF wind component forecasts, can be found at: https:/www.weather.gov/zny/n90 && .MARINE... With high pressure building across, winds and seas will be below below advisory levels throughout today and tonight until Fri afternoon. As S winds increase ahead of an approaching frontal sys Fri night, minimal SCA cond expected on the ocean E of Fire Island Inlet, with gusts to 25 kt and seas 5-6 ft. After a lull daytime Sat, SCA conditions will redevelop on the ocean waters late Sat night. SCA ocean seas will be on-going Sunday morning. Then with complex low pressure passing to the north, and a secondary low deepening over the Canadian Maritimes late Sunday into Sunday night, and the passage of a cold front Sunday, SCA conditions develop across all the waters Sunday. Gusts increase Sunday night with the potential of gales on all the waters, with gales continuing into Monday morning on the ocean waters. Will highlight the potential gales in the Hazardous Weather Outlook. The Canadian Maritime deep low tracks away from the region late Monday into Monday night as high pressure builds to the south. Wind gusts fall below SCA on the non ocean waters by late Monday with SCA conditions on the ocean waters into Wednesday as the high moves off the southeastern coast and low pressure moves into the eastern Great Lakes. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. NJ...None. MARINE...None. && $$ DISCUSSION...BR/MET AVIATION...MW MARINE...BR/MET |
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