Area Forecast Discussion
Issued by NWS Upton, NY

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509 FXUS61 KOKX 130858 AFDOKX Area Forecast Discussion National Weather Service New York NY 458 AM EDT Sun Jul 13 2025 .SYNOPSIS... The region will remain between a frontal system to the northwest and a departing high pressure area to the northeast. The associated cold front approaches Monday and moves across Monday night into early Tuesday. The frontal boundary then stays within the vicinity of the region through midweek. A cold front may approach the area by the end of the week. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... The local area will be in between high pressure southeast Nova Scotia and a frontal system traversing slowly within SE Canada. The warm front is already well north and east of the region. The local region has light easterly flow today overall. Not expecting much in the way of measurable rainfall today. Think that most locations will not receive measurable rain. However, multiple CAMs indicate as well as more larger scale coarse resolution models small discrete areas of QPF or reflectivity traversing the local area. From BUFKIT sounding analysis, there is still drier air between 5 and 25 kft above the ground. From 5kft to the ground, there is enough depth of moisture to have some drizzle or rain sprinkles. Otherwise, NBM has been too aggressive with its POPs for showers and thunderstorms. CAMs show a general lack of convection in the local area. Lowered manually the NBM POPs and now just in and around NW Orange has the chance for showers and thunderstorms. For temperatures, used the NBM but manually lowered for locations within Southern Connecticut and Eastern Long Island. These locations will be on the lower end of high temperatures in the upper 70s while the warmest spots are in NE NJ and portions of the interior with highs in the upper 80s. With the humid airmass, heat indices or apparent temperatures still will be a few degrees warmer than the actual temperatures. However, the max heat indices are mostly in the lower 90s, below heat advisory criteria. && .SHORT TERM /6 PM THIS EVENING THROUGH TUESDAY NIGHT/... For tonight, the flow becomes more southeast. Clouds remain abundant and some patchy fog and drizzle may develop along parts of the region. Otherwise, small chance of a shower or thunderstorm to the northwest by Orange County NY. Min temperatures were from NBM ranging only from the upper 60s to lower 70s. For early next week, frontal system from SE Canada approaches with an associated cold front. This cold front approaches from Monday and moves into the area Monday night. Chances for showers and thunderstorms increase across a larger fraction of the region. The front slows down as it exits early Tuesday. Continued chances for showers and thunderstorms. Downward trend in POPs Tuesday into Tuesday night as cold front pushes farther south of Long Island. Airmass gradually getting warmer early next week with synoptic flow becoming more southerly. Highs more in the 80s with some places reaching near 90 for Tuesday. Corresponding heat indices get more near the low to mid 90s, especially Tuesday. && .LONG TERM /WEDNESDAY THROUGH SATURDAY/... ***Key Points*** *While still some uncertainty, there is the potential for a heat wave to continue Wednesday through Friday for many areas with max h eat index values between 95 and 100 (2-day Heat Advisory Criteria) for Wednesday and Friday and 100 to 105 possible for Thursday (1-day Heat Advisory criteria). *Relatively active pattern with chances for several days of afternoon showers and thunderstorms. A frontal boundary will likely stall just offshore and linger in the area Wednesday into Thursday. A frontal system may then impact the area later in the week. Aloft, the pattern stays the same through the period. Although we are under some high heights, we are somewhat on the eastern end of a broad upper level trough centered over central Canada and few shortwaves likely pass through. With strong Bermuda high in place, a S/SW flow will allow plenty of moisture to be sent our way. This combined with above normal high temperatures brings some potential for a heat wave, with heat index of 95-100 currently expected Wednesday and Thursday, and 100 to 105 for many spots on Thursday. However, there still is uncertainty especially given the potential for convection and slight inconsistencies in a late week frontal system among the guidance. Too early to talk specifics when it comes to severe or flooding concerns with the aforementioned convection. These details will be ironed over the next few days. There is plenty of moisture around with pwats 1.50-2.00+ for much of the period so any convection that does develop will likely be able to produce heavy downpours. As for severe, while we are pretty unstable, shear looks weak through much of the period. && .AVIATION /09Z SUNDAY THROUGH THURSDAY/...
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Weak high pressure remains in place offshore through Sunday, slowly drifting east through the day and into Sunday night. Mostly MVFR through daybreak. Some IFR mainly east of the city terminals. For today, conds improve to VFR for most by noon. There is a chance the KGON does not improve to VFR, though the current forecast is for a brief period of VFR between 22Z today and 00Z Monday. MVFR conditions move back into the area tonight, with a chance of IFR for most terminals, but confidence is not high enough to put in the forecast just yet. SE winds under 10 kt, becoming light and variable or a light E flow through daybreak. SE winds today at around 10 kt. There may be isolated gusts to around 15 kt during the late morning into the afternoon. ...NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty... Low chance for IFR conditions through daybreak. For KJFK, IFR might not occur at all, or prevail for a few hours overnight. For KLGA/KEWR/KTEB, tempo IFR cigs possible through daybreak. If IFR occurs at any of these 3 terminals, chances are that it won`t prevail for more than a few hours. .OUTLOOK FOR 06Z MONDAY THROUGH THURSDAY... Sunday night: Mostly MVFR, but IFR possible east of the city terminals. Monday: MVFR or lower in the afternoon and early evening with showers and thunderstorms likely. Tuesday-Thursday: Mainly VFR. Showers or thunderstorm possible in the afternoon and evening. Detailed information, including hourly TAF wind component forecasts, can be found at: https:/www.weather.gov/zny/n90
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&& .MARINE... Weak pressure gradient continues with sub-SCA conditions on all waters through early week. With a weak pressure gradient, winds and waves likely remain below Small Craft Advisory criteria Wednesday through Thursday. A strengthening southwesterly flow ahead of an approaching cold front Thursday night will allow seas to build to 5 ft, especially from Fire Island to Montauk Point. Additionally, a relatively active pattern is expected next week with chances of afternoon showers and thunderstorms for several days. Winds and waves will be higher in any storms. && .HYDROLOGY... Possible minor flooding Monday into Monday night. Marginal risk for flash flooding. PWATS get slightly above 2 inches. In the long term, localized hydrologic impacts are possible due to thunderstorms from Wednesday through next weekend. && .TIDES/COASTAL FLOODING... For Atlantic Ocean beaches, the rip current risk today and Monday is moderate with an onshore flow near 10 kt, a 3 ft swell from the southeast at a 7 to 8 sec, and added onshore swells, one of which is a long period swell. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. NJ...None. MARINE...None. && $$ SYNOPSIS...JM/JP NEAR TERM...JM SHORT TERM...JM LONG TERM...JP/JT AVIATION...JP MARINE...JM/JP HYDROLOGY...JM/JP TIDES/COASTAL FLOODING...