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Forecast Discussion for New York City/Upton, NY
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329 FXUS61 KOKX 080918 AFDOKX Area Forecast Discussion National Weather Service New York NY 518 AM EDT Mon Jun 8 2026 .WHAT HAS CHANGED... No significant changes at this time. && .KEY MESSAGES... 1) Warming trend early into midweek. Dry until Wednesday. 2) Rain chances return Wednesday, periodic showers and thunderstorm possibilities mid to late week, especially afternoon into evening. Mainly dry weekend. 3) Mid to late week warming trend continues. Airmass getting very warm and humid. Potential heat wave. && .DISCUSSION... .KEY MESSAGE 1... Mid level ridging through early Tuesday. This gets more suppressed and pushed south and east with incoming shortwave trough late Tuesday. The shortwave trough moves across Wednesday. Some mid level ridging follows thereafter Thursday. Next larger trough approaches towards end of week, with model timing differences but stays mostly north and west of region. Ridge overall will be moving farther east next weekend with more zonal flow in mid levels. At surface, high pressure builds in from the north today and will center over the region this afternoon into tonight. High temperatures forecast near normal. Expect morning clouds to scatter out with subsidence and ridging aloft. Tonight with the mostly clear sky, optimal radiational cooling expected with more vast range in lows expected. For Tuesday, still mostly sunny sky conditions expected. More low level warm air advection expected with more low level SW flow getting established with the synoptic pattern change. High pressure is moving farther away, into the Western Atlantic but ridging aloft early will still be strong. The ridging weakens Tuesday night with more clouds expected to move in. More clouds also forecast for Wednesday and possible showers with some thunderstorms possible as well for the region. For Wednesday, instability not building too much yet, limiting the thunderstorm potential. Despite the possible showers and thunderstorms, more low level warm air advection with higher SW flow is forecast. This is ahead of the shortwave. Higher temperatures forecast near NYC and north and west with relatively similar temperatures to the east. During the period of Tuesday into Wednesday, airmass is getting more humid. Forecast dewpoints trend from 40s to near 50 Tuesday to low to mid 60s Wednesday afternoon. .KEY MESSAGE 2... Warming trend increases further for Thursday with multiple guidance indicating this to be relatively warmest day of the week. 850mb temperatures increasing a few degrees C with some model solutions. Forecast high temperatures take more of a rise, reaching more into the lower 90s for many locations. Slightly lower temperatures for Friday but still near 90 for many locations. Dewpoints rise more into mid to upper 60s Thursday and Friday. Potential for heat indices mid 90s to near 100 both Thursday and Friday, especially NYC and locations north and west. For the weekend, airmass gets less humid with lower dewpoints but will stay hot. Still higher heights aloft and next trough stays mostly well north and west in the mid levels. High pressure remains quite weak so without much forcing and rain, airmass will not cool down too much. Forecast highs still upper 80s to lower 90s for many locations. .KEY MESSAGE 3... Chances for showers and thunderstorms continue especially for afternoon into evening hours mid to late week. Higher chances for thunderstorms Thursday and Friday with more CAPE available. Model timing has differences with fronts. It appears warm front moves across Wednesday night and area is warm sectored Thursday into Friday before a cold front approaches late in the day and through the area Friday night. Mainly dry for weekend. && .AVIATION /09Z MONDAY THROUGH FRIDAY/... High pressure builds in from the north through today, moving overhead into tonight. Mainly VFR. Brief MVFR cigs at NYC terminals may linger shortly past 9Z, then VFR through the TAF. NE flow to start, with speeds lightening to around 10 kt for the morning push. Occasional gust up to 20 kt possible. Winds will continue to veer around, becoming SE/S by afternoon. The flow lightens further this evening, becoming variable at outlying terminals, or light SW otherwise tonight. ...NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty... Amendments likely for wind shifts today. Occasional gust to 20 kt possible through the day, especially at KEWR. .OUTLOOK FOR 06Z TUESDAY THROUGH FRIDAY... Tonight through Tuesday night: VFR. Wednesday: MVFR or lower possible at times w/ chances of afternoon showers and thunderstorms from NYC metros north and west, then throughout in the evening. SW winds G20kt. Thursday-Friday: MVFR or lower possible at times w/ chances of showers and thunderstorms in the afternoon and evening. Detailed information, including hourly TAF wind component forecasts, can be found at: https:/www.weather.gov/zny/n90 && .MARINE... Sub-SCA conditions are expected to continue with high pressure in control through tonight. The high pressure area moving farther southeast into the Western Atlantic will make for more of a southerly flow and fetch on Tuesday. The pressure gradient is expected to tighten and with Ambrose jet likely to develop, western ocean zones west of Moriches Inlet could gust near SCA levels for some time late in the afternoon Tuesday into the early evening Tuesday. Otherwise, sub-SCA conditions are forecast to continue across the other marine zones. For the non-ocean zones, the sub-SCA conditions are forecast to continue through Friday night. For the ocean, another round of SCA conditions for Wednesday for both gusts and seas. The ocean SCA levels seas may very well linger into late week. Rip Currents... For today, the rip current risk is moderate as winds gain a more onshore component today near 10 kt with a lingering easterly ocean swell of near 3-4 ft and 5 sec period. Wave heights are expected to be near 3 to 4 ft. For Tuesday, the rip current risk is also moderate. Southerly winds of near 10 to 15 kts are expected with gusts near 20 kt. Southerly ocean swells near 3-4 sec and easterly ocean swells near 6-8 sec are expected with the southerly one increasing in the afternoon. Wave heights of near 2 to 3 ft are expected. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. NJ...None. MARINE...None. && $$ DISCUSSION...JM AVIATION...DR MARINE...JM |
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