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Forecast Discussion for New York City/Upton, NY
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225 FXUS61 KOKX 201835 AFDOKX Area Forecast Discussion National Weather Service New York NY 235 PM EDT Wed Aug 20 2025 .SYNOPSIS... A stationary front remains south of the area tonight as Hurricane Erin tracks northward over the Atlantic. Erin then tracks out to sea through the end of the week as high pressure builds into the area. A frontal system may produce chances for showers for the beginning of next week. Please refer to NHC forecasts for further information on Hurricane Erin. && .NEAR TERM /THROUGH TONIGHT/... An upr trough passes thru the area tngt. This will produce some rain across the area, especially this eve. Moisture is fairly shallow per the GFS and NAM time heights, indicating a lack of a tropical connection. However, decent frogen around 2k ft is indicated, especially tngt, which would serve to enhance lift and rainfall. Because of this, went abv the NBM for rainfall amounts. There could be an embedded tstm with the extra lift despite the limited instability. ENE winds will increase overnight, especially at the coasts, as the pres gradient increases ahead of Erin. Streamlines show the flow coming from the N Atlc, so cool temps tngt in the 50s and lwr 60s with the rain. && .SHORT TERM /THURSDAY THROUGH THURSDAY NIGHT/... Coastal flooding and dangerous surf will be the primary hazards Thu and Thu ngt. Please see the TIDES/COASTAL FLOODING section for details. Erin makes the turn on Thu and heads out to sea. NE flow with moisture transport at h85 should keep the area mostly cloudy to ovc thru most of the day, particularly E. There could be a few pockets of lgt rain or sprinkles, especially in the mrng, until subsidence increases thru the day. Winds will back and strengthen thru the day, with the strongest flow in the aftn and eve attm. Strongest winds over ern cstl areas where gusts 30-40 mph are possible. The NBM was followed for temps. && .LONG TERM /FRIDAY THROUGH WEDNESDAY/... High pres builds in on Fri, with a dry airmass and decreasing nly winds. The flow appears lgt enough by aftn allowing sea breezes to develop. Highs in the lower 80s per the NBM. Continues dry on Sat attm with highs again the the 80s per the NBM. A sly return flow off the ocean so an increase in humidity can be expected. An approaching upr trop brings swly flow aloft on Sun, then the trof slows over the region thru the beginning of next week. This should keep temps on the cooler side of normal, and produce chances for shwrs and perhaps isold tstms at times. The NBM was followed. && .AVIATION /19Z WEDNESDAY THROUGH MONDAY/... A frontal system moves through and weakens as it heads south this evening. MVFR in SHRA. Brief IFR possible in some SHRA. IFR conditions then become more widespread this evening with showers becoming less widespread by the overnight. Winds E to NE 10-15 kt with occasional gusts to 20kts. Winds then back to NE at 10-15 kt this evening, and gusts 20-30 kt, highest along the coast, develop late. NE gusts continue Thursday 25-30kts, highest at the coastal terminals. ...NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty... Timing of lowering flight categories may be off by an hour or two. Gusts this afternoon may be more occasional. A rumble of thunder is possible late afternoon into the early evening. However, with low confidence in the occurrence not included in the forecast. .OUTLOOK FOR 12Z THURSDAY THROUGH MONDAY... Thursday: Chance of showers in the morning with MVFR/IFR cond still possible. NE winds 15-20kt G25-35kt, highest along the coast. Improving to VFR by evening. Friday: VFR. NE-N winds 15G20-25kt in the morning. Saturday: VFR. Sunday and Monday: MVFR or lower possible in any showers. Detailed information, including hourly TAF wind component forecasts, can be found at: https:/www.weather.gov/zny/n90 && .MARINE... All areas are now under a SCA for tngt, with the ocean going to gales Thu and Thu ngt, and the remaining waters staying at SCA. Dangerous/rough cond around inlets can be expected thru this period. Winds decrease on Fri, but the ocean will need a SCA thru Sat and perhaps Sun for lingering seas. All waters blw SCA lvls on Mon attm. && .HYDROLOGY... Around an inch of rain is possible thru tngt. Some locally higher amounts are possible, particularly ern LI and ern CT, where convergence of moisture and forcing is greatest. In general, there is a chance for some pockets of minor urban and poor drainage flooding thru tngt. If the locally hvy rain develops, there is a low chance for an isold flash flood mainly ern areas. The area remains in a mrgnl risk for excessive rainfall. No significant hydrologic impacts are expected Fri-Tue. && .TIDES/COASTAL FLOODING... A High Surf Advisory and High Rip Current risk are in effect for all Atlantic Ocean beaches through Friday as swell from Hurricane Erin will bring life-threatening surf and rip currents. Life-threatening surf and rip currents expected for the rest of this week as building long period swells from Erin continue, peaking Thu/Fri. Surf heights could reach 12-16 ft from Thu afternoon and continuing into early Fri morning, as large, very long period swells (10-11 ft @ 15-17 sec) arrive nearly head on at the beaches. The threat for beach flooding, beach erosion and escarpment and areas of dune erosion will increase with successive high tides thru Thu night. Widespread areas of dune erosion are likely with localized overwashes during the Thu evening and Fri morning high tides. This high surf will be combined with elevated water levels as we approach a new moon. Widespread moderate coastal flooding is expected for southern Queens, southern Nassau, and southwestern suffolk counties. For eastern Long Island, moderate flooding will likely be more localized, with north facing exposed shoreline areas along the southern and eastern bays being the most susceptible due to to enhanced wave action. This includes Orient Point. Elsewhere, minor coastal flooding is expected with Thursday evening`s high tide cycle for southern Brooklyn, the NY Harbor, and much of the CT & NY coastlines along the Long Island Sound. Coastal Flood Advisories have been issued in these areas. Additional rounds of minor flooding are expected with Friday morning and Friday evening`s high tide cycles. Advisories are in place for the areas at highest risk. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...Coastal Flood Advisory from 8 PM Thursday to 1 AM EDT Friday for CTZ009>011. Coastal Flood Advisory from 10 PM Friday to 2 AM EDT Saturday for CTZ009. NY...Coastal Flood Advisory from 8 PM Thursday to 1 AM EDT Friday for NYZ071-073-078-176-177. Coastal Flood Advisory from 10 PM Friday to 2 AM EDT Saturday for NYZ071. Coastal Flood Advisory from 6 PM to 11 PM EDT Thursday for NYZ072-074-075. Coastal Flood Advisory from 6 PM to 11 PM EDT Friday for NYZ072-074-075. High Risk for Rip Currents through Friday evening for NYZ075-080- 081-178-179. High Surf Advisory until 8 PM EDT Friday for NYZ075-080-081- 178-179. Coastal Flood Warning from 5 PM Thursday to 3 AM EDT Friday for NYZ079-081. Coastal Flood Advisory from 5 AM to 2 PM EDT Friday for NYZ079- 081. Coastal Flood Warning from 5 PM Thursday to 1 AM EDT Friday for NYZ080-178-179. Coastal Flood Advisory from 5 AM to 1 PM EDT Friday for NYZ080- 178-179. Coastal Flood Advisory from 6 PM Friday to 2 AM EDT Saturday for NYZ080-178-179. NJ...Coastal Flood Advisory from 6 PM to 11 PM EDT Thursday for NJZ006-106-108. Coastal Flood Advisory from 6 PM to 11 PM EDT Friday for NJZ006-106-108. MARINE...Small Craft Advisory from 6 PM this evening to 2 PM EDT Friday for ANZ331-332-340-345. Small Craft Advisory from 6 PM this evening to 6 AM EDT Friday for ANZ335-338. Small Craft Advisory until 6 AM EDT Thursday for ANZ350-353- 355. Gale Warning from 6 AM Thursday to 2 PM EDT Friday for ANZ350. Gale Warning from 6 AM Thursday to 6 AM EDT Friday for ANZ353- 355. && $$ SYNOPSIS...JMC NEAR TERM...JMC SHORT TERM...JMC LONG TERM...JMC/JT AVIATION...DBR MARINE...JMC HYDROLOGY...JMC TIDES/COASTAL FLOODING...BR |
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