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Forecast Discussion for New York City/Upton, NY
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748 FXUS61 KOKX 162318 AFDOKX Area Forecast Discussion National Weather Service New York NY 718 PM EDT Tue Jun 16 2026 .WHAT HAS CHANGED... Coastal flood statements are now in effect for a few locations tonight. && .KEY MESSAGES... 1) Water levels will be close to minor coastal flood benchmarks tonight for the nighttime high tide cycles. 2) Showers are possible mainly west of the Hudson River on Wednesday with a chance of a thunderstorm. Impacts look limited. 3) A storm system brings a threat of severe weather during Thursday into Thursday evening - low confidence. Heat and flooding impacts not anticipated. 4) There is a high risk of rip currents on Thursday. && .DISCUSSION... .KEY MESSAGE 1... Still have high astronomical tides through midweek but getting relatively farther away from the new moon so these levels will slightly lower. A strengthening southerly flow tonight may provide just enough wind forcing to offset the slight decrease in tide levels and produce water level near minor coastal flood benchmarks for the more vulnerable locations. Coastal flood statements have been issued for southern Nassau and southern Fairfield for tonight`s high tides, where up to 0.2 ft of inundation is expected, with isolated areas up to 0.3 ft of inundation. A storm system impacting the area on Thursday with a strong southerly flow will also need to be watched, but winds should veer enough to the west before high tide Thursday night to keep water levels below minor coastal flood benchmarks. Parts of southern Queens and Bergen Point may just touch minor, but there was not enough confidence to issue a statement for these areas. .KEY MESSAGE 2... Weak wave of low pressure along an approaching warm front passes by to our south Wednesday morning. Guidance consensus keeps us dry during this time. CAPE then increases into the afternoon, and with residual moisture, showers will be possible with a thunderstorm chance. Although shear increases, mechanical forcing is relatively weak, so severe weather is not anticipated. That said, some storms could be strong where CAPE is able overcome the lack of mechanical lift - generally west of the Hudson River. As for the rain, no impacts anticipated due to the combination of conditional thunderstorm chances, storm motion and only modest moisture in place. .KEY MESSAGE 3... A broad upper trough encompassing the northern two thirds of the country from the Northern Plains to the eastern seaboard will send a strong shortwave trough across the Great Lakes and into eastern Canada Wednesday night into Thursday. At the surface, low pressure deepens below 990 mb, passing well north and west of the forecast area on Thursday, sending a warm front through the area by late morning and/or early afternoon. The best thermal forcing and stratiform rain will mainly pass to the north. However, the system is very disjointed as the region will reside in the warm sector Thursday, but the cold front will not arrive until later in the evening. In addition, winds will veer to the SW with evidence of drying in the low-levels with MLCAPE values below a 1000 J/KG and unimpressive mid level lapse rates. Deep-layer shear (0-6km) is impressive at 50-60 kt, but with too much of an imbalance with the CAPE, storms could have a difficult time developing along and ahead of the cold front. Bottom line, ingredients are there, but not aligned. Now there is also some question if we can destabilize enough as the warm front works through in the morning hours Thursday for any strong convection. Instability is mainly elevated during this time. SPC continues to keep much of the area within a slight risk of severe thunderstorms for Thursday. Main impacts would be due to gusts, but a potential for large hail would exist based on shear and CAPE within the hail growth region. Flooding impacts would be limited even though moisture will be higher this time around. The forward speed of any cells should mitigate flooding impacts. Thursday also will be the warmest day of the week with highs mostly in the 80s, with some low 90s for parts of the city and the urban corridor of NE NJ. Heat indices should remain below 95 as dewpoints drop a little in the afternoon during peak heating. As for winds, it could be quite gusty during the day with a potential of 30-40kt gusts regardless of any thunderstorms. Low level jet(s) timing and strength limit the threat of advisory-level gusts. .KEY MESSAGE 4... A high rip current risk appears likely for Thursday for all beaches with strong onshore flow and building seas expected, and this could linger into Fri. && .AVIATION /00Z WEDNESDAY THROUGH SUNDAY/... High pressure departs offshore tonight. A warm front approaches the region Wednesday into Wednesday night. Mainly VFR conditions are expected through the TAF period. Any exception would be the potential for any brief showers during Wednesday afternoon into early evening which could result in temporary reductions in visibility to MVFR. For this same time period, there is low probability for some thunderstorms, too low to include in TAFs at this time. Also there is a low probability for sub VFR arriving towards the tail end of the 30 hr TAF period for KJFK and KLGA, but confidence in occurrence remains too low to include in TAF at this time. Winds overall mainly S or SW this evening, with coastal terminals primarily around 10 kt. Some of the interior terminals will settle in with wind speeds closer to 5 kt or less at times overnight as the winds become more variable in direction. Otherwise a southerly flow at 5 to 10 kt will prevail overnight for most city and coastal terminals. During late Wednesday morning into the afternoon a S flow becomes more SE, especially later in the afternoon. ...NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty... Low chance of a thunderstorm for western terminals (KEWR and KTEB) Wed afternoon and evening. Confidence remains low at this time. .OUTLOOK FOR 00Z THURSDAY THROUGH SUNDAY... Wednesday night: Mainly VFR through the evening. Chance of MVFR or lower late, especially for southern and eastern terminals. Thursday: Chances of MVFR/IFR conditions increasing toward afternoon and evening with showers/tstms. SW wind gusts near 25-30kt day into early eve, then gusts near 20kt. Possible LLWS. Friday: Mainly VFR. W wind gusts near 20kt afternoon into eve. Saturday: VFR. NW wind gusts near 20-25kt day into eve. Sunday: VFR. W-NW wind gusts near 20kt day into eve. Detailed information, including hourly TAF wind component forecasts, can be found at: https:/www.weather.gov/zny/n90 && .MARINE... Below SCA level conditions are expected through Wednesday night with high pressure influence. SCA level conditions become likely on all waters Thursday into Thursday night with the next storm system approaching and passing through. Maybe even some possible low-end gale force wind gusts, but a low level inversion may prevent widespread gales. Will at least include a mention of the threat over all waters in the HWO for the time being. Not enough confidence for a Gale Watch at this time. SCA conditions otherwise should last into Thu night. SCA conditions are then possible once again on Saturday with a gusty WNW flow. Rip currents: there remains a moderate risk of rip currents through this evening with a lingering 2-3 ft S swell. As S winds increase the risk could become high late in the afternoon for the NYC and Nassau beaches. There is moderate risk of rip currents for Wednesday (though some beaches may see low risk for part of the day such as at Jones Beach, Ocean Beach, and perhaps East Hampton), See key message 4 for the high risk of rip currents for Thursday. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. NJ...None. MARINE...None. && $$ DISCUSSION...JC/JP AVIATION...JE MARINE...JC/JP |
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