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Forecast Discussion for New York City/Upton, NY
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471 FXUS61 KOKX 250622 AFDOKX Area Forecast Discussion National Weather Service New York NY 222 AM EDT Thu Jun 25 2026 .WHAT HAS CHANGED... No significant changes were made. && .KEY MESSAGES... 1) A complex frontal system will impact us today through Saturday bringing several chances for showers and thunderstorms. Severe and flash flooding impacts are not anticipated at this time. 2) High pressure builds late this weekend into the middle of next week. With it may come a prolonged period of summer heat. However, confidence is low towards mid-week with unsettled weather remaining in the cards. && .DISCUSSION... .KEY MESSAGE 1... A complex frontal system will impact us today through Saturday bringing several chances for showers and thunderstorms. Severe and flash flooding impacts are not anticipated at this time. Late this week and early this weekend, an upper-level jet streak will traverse near the region. This jet streak aloft with a shortwave aloft will help guide a weak a surface low from the Great Lakes to New England late today into Friday morning. This low will bring bring a warm front through the area late today which will bring up PWATs to modest levels tonight between 1.5 and 1.75". This front will then stall near the area, aiding in lift for showers and thunderstorms. Likely chances for showers will begin tonight, aided by synoptic level lift as we sit under the left exit region of a jet streak. The chance for showers will end in the morning as the weakening low washes out over New England. There may be enough instability Thursday evening and early Thursday night for some shots of thunderstorms. Best instability will be in the interior N&W of NYC. Then as thunderstorms progress eastward into tonight, they will move into a more unfavorable environment along the coast. Another shortwave aloft will bring a surface low from the Ohio River Valley Friday into our region Friday night into Saturday. This low will pass along an already existing stalled frontal boundary near the region. This one looks to arrive on the later side of things, with most shower chances occurring late Friday night into early Saturday morning. This also aligns with the best synoptic level lift as the region sits under the right entrance region of a jet streak. A few lingering showers are possible on Saturday, as the weakening low slowly traverses the area. However, rising heights aloft later on Saturday will lead to dry conditions by Saturday evening. MOst of what occurs will be plain showers. The one shot we have for thunderstorms with this second low will be Friday afternoon in the interior. There won`t be much lift available with the low still far away. If thunderstorms occur, they may remain very isolated. Temperatures today and Friday look to be warm with highs in the low/mid 80s and lows in the 60s. It will also be noticeably more humid as we will be warm-secorted by the warm front. However, heat indices will not be a concern. By Saturday, we will no longer be warm-sectored, so less humid air returns with highs slightly cooler in the mid/upper 70s. .KEY MESSAGE 2... Surface high pressure will drop down from Canada on Sunday and cause conditions to dry out. Meanwhile, mid level ridging begins to amplify over the Midwest, with the local area straddling the eastern periphery of this ridge. Plenty of uncertainty with the strength and positioning of the ridge as it attempts to build east. Some model guidance show a digging trough over the Western Atlantic may try to close off which would lead to a cooler, more unsettled pattern. Conversely, there are other models that offer shallower, more transient troughing that favors warmer weather with a quicker eastward expansion of the ridge. Adding to the low confidence is the possibility of any ridge rollers coming down into the area, producing more in the way of convection and muted temperatures. NBM spread captures this uncertainty well, with 15+ degree separation between the 25th and 75th percentile high temperatures mid next week. For now, increasing confidence in seasonable summer heat returning early week, with at least the possibility for hotter weather mid to late next week, though many solutions still on the table. && .AVIATION /07Z THURSDAY THROUGH MONDAY/... High pressure settles in overnight and remains through the morning. A warm front approaches western terminals later in the afternoon Thursday and pushes across the western part of the area Thursday evening. The warm front is then expected to stall nearby Thursday night. VFR conditions are expected to continue through the TAF period at most terminals. Light and variable winds expected overnight. On Thursday the winds start off mainly out of the SE at 5 to 10 kt, then increase to around or just above 10 kt and become more southerly towards or just after 18z. Occasional gusts around 20 knots are possible at the NE NJ terminals towards 18-20Z Thursday afternoon. ...NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty... There remains uncertainty around the timing of a wind direction shift from the SE to S Thursday afternoon. Also there is low confidence in prevailing gusts, thus there are currently no prevailing wind gust group in TAFs for Thursday afternoon, with only TEMPO group at KEWR and KTEB. .OUTLOOK FOR 06Z FRIDAY THROUGH MONDAY... Thursday night: MVFR in showers. Chance of a thunderstorm late mainly for city and western terminals. Friday-Saturday: MVFR or lower possible with showers at times. Sunday: VFR. Monday: VFR. Detailed information, including hourly TAF wind component forecasts, can be found at: https:/www.weather.gov/zny/n90 && .MARINE... Sub-advisory conds are expected to prevail through the forecast period. Rip Currents: A moderate risk of rip currents Thursday, Friday, and Saturday with 2 to 3 ft southerly swells at 5-7 sec periods. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. NJ...None. MARINE...None. && $$ DISCUSSION...BR AVIATION...JP MARINE...BR |
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