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Forecast Discussion for New York City/Upton, NY
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390 FXUS61 KOKX 102044 AFDOKX Area Forecast Discussion National Weather Service New York NY 444 PM EDT Wed Sep 10 2025 .SYNOPSIS... Offshore frontal boundary and area of low pressure track further out in the Atlantic into tonight. High pressure then builds into the region through Saturday. Low pressure and associated cold front will impact the region Sunday into Monday. High pressure returns for Tuesday and Wednesday. && .NEAR TERM /UNTIL 6 AM THURSDAY MORNING/... Weak 1014 mb wave of low pressure along a frontal boundary off the Delmarva shifts farther out to sea tonight as surface high pressure centered well off to the north and west builds east. With the exiting system, improving conditions can be expected through this evening after the relatively dreary day. Showers have already largely dissipated, with drying conditions this evening. NE flow lightens and backs more N into tonight, and a much drier air mass punches in, with cloud cover eroding as PWATs fall from over 1.5 in to 0.5 in by daybreak Thursday. Lows tonight range from around 60 in NYC, to the upper 40s in outlying locales of the interior LoHud Valley. && .SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/... Return to warmer and drier weather on Thursday. Abundant sunshine and deep mixing above 800 mb should allow temperatures to rebound a good 10 degrees compared to Wednesday. Afternoon highs top out within a degree or two of 80 for most locales away from the immediate shoreline. Light N flow continues through the day, and dew pts falling down into the 40s keeps humidity levels low. Temperatures Thursday night fall back into the 50s and 60s for most. && .LONG TERM /FRIDAY THROUGH WEDNESDAY/... Stuck fairly close to the NBM except for sky cover for the end of the weekend and start of next week with forecast models showing an upper level trough and cold front impacting the region. The long term period starts off with high pressure building into the area Friday and Saturday. The high then slides eastward, allowing an upper level trough to move across the area. Some of the forecast models are hinting at an area of low pressure developing at the base of the trough as it swings across the region. So, expect clouds to increase along with a chance of rain showers. NBM Sky grids seemed too low, so increased cloud cover to make the forecast be more mostly cloudy/overcast. Depending on the evolution of the trough moving across the area and whether or not low pressure develops at the base of the trough will depend on how much precipitation we see. The trough moves east late Monday into Monday night with drier conditions moving in for Tuesday and Wednesday as high pressure builds back into the region. High temperatures through the long term will be in the 70s. Lows will be in the 50s. && .AVIATION /21Z WEDNESDAY THROUGH MONDAY/... Offshore low pressure will gradually track away from the area into Thursday, while high pressure builds in from the west. Expect occasional MVFR ceilings this afternoon across the NYC terminals, as well as KISP. Otherwise, this will be a VFR forecast with gradual clearing through tonight. Winds will be NE-N generally around 10 kt with occasional gusts near 20 kt this afternoon. Wind then become northerly tonight at less than 10 kt. Late day seabreeze is possible at KJFK Thursday afternoon. ...NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty... Timing of improvement to VFR could vary by 1-2 hours. Wind gusts may be more occasional in frequency. .OUTLOOK FOR 18Z THURSDAY THROUGH MONDAY... Thursday-Saturday: VFR. Sunday into Monday: Mainly VFR. Chance of MVFR with a chance of showers. Detailed information, including hourly TAF wind component forecasts, can be found at: https:/www.weather.gov/zny/n90 && .MARINE... Small Craft Advisory (SCA) remains in effect until noon Thursday on local ocean waters for elevated winds and seas. NE gusts up to 25 kt persist into this evening before abating, but 5 to 6 ft seas linger through Thursday morning or early afternoon before subsiding. Thereafter, conditions are expected to remain below SCA criteria on all local waters through this weekend. && .HYDROLOGY... There are no hydrologic concerns through early next week. && .TIDES/COASTAL FLOODING... E flow 15-20 kt with gusts up to 25 kt will help build an E wind wave component to 5-7 ft at 7-8 seconds. This combination leads to a high rip current risk into this evening. Given wind and wave direction will be parallel to the shoreline, surf height is expected to top out around 4-5 ft. With a more N flow on Thursday, a moderate risk of rip currents is expected. The moderate risk will continue into Friday. Given astronomically high water levels from a recent full moon, we can expect another round of minor coastal flooding for some locales along the western LI Sound and the back bays of Nassau during the time of high tide on Thursday. Advisories are in effect for these locations. Confidence is low elsewhere, but a statement could issued later for localized minor if the threat increases. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...Coastal Flood Advisory from 2 PM to 4 PM EDT Thursday for CTZ009. NY...Coastal Flood Advisory from 2 PM to 4 PM EDT Thursday for NYZ071. High Risk for Rip Currents until 9 PM EDT this evening for NYZ075- 080-081-178-179. Coastal Flood Advisory from 11 AM to 2 PM EDT Thursday for NYZ179. NJ...None. MARINE...Small Craft Advisory until noon EDT Thursday for ANZ350-353- 355. && $$ SYNOPSIS...DR NEAR TERM...DR SHORT TERM...DR LONG TERM...BC AVIATION...DW MARINE...BC/DR HYDROLOGY...BC/DR TIDES/COASTAL FLOODING... |
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NWS New York City/Upton, NY (OKX) Office Forecast Discussions.
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