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Forecast Discussion for New York City/Upton, NY
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961 FXUS61 KOKX 110336 AFDOKX Area Forecast Discussion National Weather Service New York NY 1136 PM EDT Tue Mar 10 2026 .WHAT HAS CHANGED... No significant changes with the latest forecast. && .KEY MESSAGES... 1) Unseasonably mild / warm air will be in place through Wednesday and most of Wednesday night. Areas of low clouds/fog develop again during the evening and nighttime hours to the east for coastal sections for tonight and potentially for a portion of Wednesday evening. 2) A strong frontal system impacts the area Wednesday night into Thursday with the next chance for rain, likely changing to and ending as some wet snow later Thursday, followed by noticeably cooler and more seasonable air at the end the week. 3) An Alberta Clipper will bring a small chance for light mixed precipitation Friday into Friday night with breezy winds lasting into Saturday. 4) A potent Colorado Low will bring chances for precipitation Sunday through Monday night also with strong winds. Most of the event will be plain rain, but some snow may mix in at the onset and upon the system`s exit. && .DISCUSSION... .KEY MESSAGE 1... With anomalously warm airmass in place, overnight lows will only drop into the 30s and 40s, which is not too excessively warm for this time of year thanks to the relatively dry airmass (dew points are in the 30s and 40s). Coldest lows should be along the coast thanks to the relatively cold waters. Temperatures climb to well above normal as 850 mb temperatures approach +12 C on Wednesday. However, temperatures will not be quite as warm as Tuesday, This will be mainly due to more of a south to south-southeast wind off the colder waters of the Atlantic. Also there will likely be more in the way of cloud cover, especially later in the day. With the development of diurnally driven winds off the colder waters, look for low cloud and fog development along and closer to the coast once again for tonight into Wednesday morning. Locally dense fog is possible, and will have to monitor for the potential for a Dense Fog Advisory for the same relative areas as last night...southern and Twin Forks of Long Island and southeast CT. .KEY MESSAGE 2... A potent mid level shortwave approaches mid week. Enough ridging out ahead of the disturbance should keep the majority of our area dry through Wednesday morning with perhaps just a slight chance for showers. The chances of rain increase into Wednesday afternoon and evening with a gusty southerly flow ahead of the boundary. The cold front should move through Thursday morning, so after a mild Wednesday night with temperatures in the upper 40s to lower 50s, the winds switch quickly to the NW on Thursday morning with a continental polar air mass moving in. Rain is likely to switch over to wet snow showers on the back side of the front as the upper level flow becomes somewhat parallel to the frontal boundary as the front attempts to behave like an anafront. Boundary temps will be noticeably milder than aloft so any wet snowflakes will have difficulty accumulating. Indications that enough elevated CAPE may be around for isolated thunderstorms, and some CAMs point to a squall line that moves through central NJ well after sunset. However, the line looks to make to our region after any daytime heating, and as it approaches the much colder waters, the line should quickly weaken. An isolated severe thunderstorm cannot be ruled out, especially across NE NJ where the best dynamics look to be in place (possible squall line moving through, high helicity values, 400-500 J/kg of elevated CAPE). SPC has a marginal risk of severe storms just to the SW of the forecast area. Liquid precipitation amounts are likely to range from a tenth to just over a half inch across the area, with the highest amounts across far NW sections, where stronger showers/thunderstorms are expected. .KEY MESSAGE 3... An Alberta clipper low swings out of Canada and into the Great Lakes region Thursday into Friday, passing through New England Friday night. Overall this system is not very amplified, residing under mainly zonal flow aloft. Mainly light precipitation is expected around the cyclonic flow of the system Friday into Friday. Much of it is expected to be warm enough to see plain rain, but some rain/snow mixing is expected in the interior. The interior also holds the better chances for seeing precipitation. Mainly southerly flow is anticipated on Friday, then increasing southwesterly winds Friday night, with peak gusts around 25-30 mph. Saturday will dry out under mainly cooler westerly flow, but may remain breezy behind an increased pressure gradient until the evening as the low exits northeast. Between Friday and Saturday temperatures will reach 50 at the warmest, and the mid-30s at their coolest, with some far interior locations possibly reaching freezing Friday night. .KEY MESSAGE 3... A Colorado Low is expected to deepen out ahead of an amplified upper- level trough that becomes negatively tilted across the Great Plains late this weekend. This low will impact the area Sunday into Monday night as it moves into the Great Lakes region and into Quebec. This system is more potent than Friday`s system and are expecting more QPF overall with this system. A warm front on Sunday will advect in moisture from the Atlantic, leading to increasing coverage of showers into Sunday night. The low`s cold front will pass on Monday, bringing with it the risk for moderate to locally heavy downpours. Its also possible there could be some marginal elevated instability with and ahead of the front. This is within the realm of possibility given its mid-March, but its too far out at this time to say with any certainty on if we`re expecting thunderstorms yet. Given the strength of the low, the amplified upper trough, and a strong developing LLJ ahead of the approaching low, a strong period of winds is possible with this system, likely peaking Sunday night into Monday ahead of the approaching cold front. Highs Sunday into Monday will be between 50 and 60 degrees, with the warmer day lying on Monday just before the cold front. && .AVIATION /04Z WEDNESDAY THROUGH SUNDAY/... Weak high pressure will remain offshore through tonight. A strong frontal system approaches the area on Wednesday. VFR for most through Wednesday morning. There is a chance of IFR to LIFR late tonight into Wednesday morning at KISP and KGON. Still uncertain as to how far west/inland any fog will make it, but have added MVFR TEMPOs for KJFK and KBDR. There is then a chance of MVFR Wednesday afternoon and evening with -SHRA. NYC terminals and north and west could also see TSRA mainly between 21z-01z. Low confidence at this time and have introduced a PROB30. Light S at the NYC metro terminals tonight, to light and variable at the outlying terminals. S flow picks up 10-15KT Wednesday afternoon. LLWS develops mainly after 00z Wednesday evening. ...NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty... There is a low chance of MVFR/IFR fog and stratus briefly reaching KJFK toward Wednesday morning. Confidence in TSRA coverage and timing is low for Wednesday at this time. .OUTLOOK FOR 00Z THURSDAY THROUGH SUNDAY... Wednesday night: Showers likely especially NW of the NYC metros, with MVFR or lower possible. Slight chance of a thunderstorm in the evening. S winds 10-15G20kt, becoming SW late. LLWS expected. Thursday: Showers likely, possibly mixing with snow before ending late in the day. MVFR or lower conditions possible. W winds 10-15G20kt, becoming NW 15-20G25kt during the afternoon. Thursday night: VFR. NW winds 10-15G20kt early in the evening. Friday: Mainly VFR. S winds 15G25kt in the afternoon. Friday night: Mainly VFR. Chance of rain or snow showers with MVFR or lower cond. Winds becoming SW-W 10-15G20-25kt. LLWS possible late at KGON/KISP. Saturday: VFR. W winds 10-15G20kt. Sunday: MVFR or lower with a chance of rain and snow. Detailed information, including hourly TAF wind component forecasts, can be found at: https:/www.weather.gov/zny/n90 && .MARINE... Dense fog for the ocean waters, the bays, is possible again tonight. Otherwise,sub advisory conditions will prevail on the waters through the first half of Wednesday. A southerly flow increases ahead of a cold front Wednesday afternoon as small craft conditions are expected to return to the ocean waters during the late afternoon, and for the remainder of the waters either late Wednesday night. Small craft conditions should persist across the waters on Thursday morning as the winds will be gusty out of the NW. Sub advisory conditions should return during Thursday afternoon on the non-ocean waters. Waves on the ocean will remain above 5 ft through the day Thursday, and will subside from west to east Thursday night. Small craft conditions are expected to return to the waters by Friday afternoon on a S flow ahead of the next frontal system as small craft conditions could linger into Saturday morning. Sub advisory conditions are then expected until late in the day Sunday as our next frontal system approaches. && .CLIMATE... Below are record high temperatures for Tuesday March 10th. EWR: 81/2016 BDR: 70/2006 NYC: 79/2016 LGA: 78/2016 JFK: 71/2006 ISP: 73/2016 && .OKX WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. NJ...None. MARINE...None. && $$ DISCUSSION...JP/BR/JT AVIATION...JT MARINE...JP/BR |
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