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Forecast Discussion for New York City/Upton, NY
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085 FXUS61 KOKX 062001 AFDOKX Area Forecast Discussion National Weather Service New York NY 401 PM EDT Mon Apr 6 2026 .WHAT HAS CHANGED... No significant changes. && .KEY MESSAGES... 1. Brief showers (possibly mixed with wet snow inland) possible tonight and then again Tuesday afternoon. 2. Unseasonably cool temperatures expected Tuesday into Wednesday. 3. A warming trend begins Thursday with above normal temperatures Friday into early next week. && .DISCUSSION... .KEY MESSAGE 1... A broad upper trough over the northeastern US will remain in place through Tuesday. A shortwave within the trough will swing across the Great Lakes tonight and move across the area on Tuesday. The shortwave will send a cold front and weak wave of low pressure through the area late tonight into early Tuesday. The aforementioned system will support the potential of a few showers tonight. Some of the coldest locations across the interior could see some wet snow flakes mixed in with any shower activity. The showers are expected to be light and no snow is expected to accumulate due to surface temperatures remaining above freezing. There will be a lull in any shower activity after day break Tuesday as the front and low pressure push offshore. The upper trough axis will swing across the area in the afternoon. Daytime heating and a pocket of cold air aloft will steepen lapse rates into the afternoon. The cyclonic flow in combination with these ingredients support a isolated shower development. The latest CAMs all signal this potential in the afternoon. Moisture is limited, but a few locations could see a brief shower. Dew points will be falling through the day, so lower wet bulb temperatures could support a few snow flakes or ice pellets across the interior. It is very possible that no measurable precip will occur out of these showers, but felt there was enough evidence to raise PoPs to slight chance across the area, about 15 percent higher than the NBM PoPs. Any shower development could produce locally gusty winds due to the dry subcloud layer, outside of the synoptic wind gusts of 20-30 mph in the afternoon. .KEY MESSAGE 2... Unseasonably cool temperatures are expected Tuesday through Wednesday. Highs on Tuesday will be a few degrees below normal in the upper 40s and lower 50s. Cold advection likely continues into Tuesday night with temperatures bottoming out in the mid 20s inland and upper 20s and lower 30s closer to the coast. The growing season has begun across the NYC metro (4/1), but has not begun elsewhere. Winds may not completely decouple, which could prevent temperatures from dropping as low as the NBM, especially if cold advection ends overnight. Temperatures may also struggle to fall below freezing if winds decouple, since radiational cooling is not as efficient across the urbanized areas. Did not sway from the NBM temperature forecast, but have held off on an issuance of a freeze watch for Tuesday night with this forecast. Will let subsequent shifts assess temperature trends with potential need for a frost/freeze headline. High pressure settles over the area on Wednesday. This will keep the cool conditions over the Tri-State with high temperatures a few degrees colder compared to Tuesday due to less mixing. It should end up slightly warmer Wednesday night in areas where the Another cold night is in store Wednesday night with lows in the upper 20s to mid 30s. A warming trend begins on Thursday with temperatures rising into the mid to upper 50s away from the immediate coast. Onshore flow will influence temperatures close to the coast where highs may struggle to reach the low 50s. .KEY MESSAGE 3... The high pressure will move offshore to end the week. Ridging builds aloft until another shortwave passage early this weekend. This will send a weak cold front across the region. Temperatures will be warming to above normal levels Thursday into Friday. There is a chance temperatures on Saturday could end up warmer than the NBM, depending on the timing of the cold front passage. Despite the cold front, temperatures should still remain above normal on Sunday. Another ridge looks to build over the east coast early next week with warm temperatures continuing across the area. Dry conditions expected late week into early next week. && .AVIATION /20Z MONDAY THROUGH SATURDAY/... A weak area of low pressure moves across the area tonight and passes to the east Tuesday morning. A large area of high pressure over the Midwest will then gradually build into the area through Wednesday. Mainly a VFR forecast through the TAF period. There is a low chance of showers overnight with the best chance across the terminals north and east of NYC. There could even be a few flakes mixing in at KSWF and KGON. Brief MVFR possible with these showers. Gusty WNW flow this afternoon will quickly diminish toward 00Z. Coastal locations may for a time veer to the WSW. Weak low pressure moves across the area tonight with winds likely becoming light and variable for a time. Behind the low, winds ramp back up on Tuesday from late morning into the afternoon, veering from W to NW in the afternoon. Gusts up to 30 kt expected. ...NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty... Winds will become highly variable toward 22Z-00Z, decreasing to under 10 kt. Isolated shower possible overnight. Gust ending timing time this evening may vary by 1-2 hours. .OUTLOOK FOR 18Z TUESDAY THROUGH SATURDAY... Tuesday Afternoon/Night : VFR. NW winds G25-30kt, gradually diminish overnight. Wednesday-Friday: VFR. Saturday: Mainly VFR. Slight chance of a shower. Detailed information, including hourly TAF wind component forecasts, can be found at: https:/www.weather.gov/zny/n90 && .MARINE... Seas around 5 ft remain possible through early this evening on the ocean east of Moriches Inlet. The SCA remains in effect until 6pm. Winds and seas will remain below SCA levels tonight. Marginal SCA gusts are possible on the ocean, NY Harbor, and western Sound Tuesday afternoon. Think they will be occasional, so have continued with no SCA for now on Tuesday. Seas should remain below 5 ft. High pressure Wednesday and Thursday will lead to a weak pressure gradient and winds and seas below Advisory levels. Ocean seas could build close to 5 ft Friday into Saturday with an in creasing return flow as the high moves offshore. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. NJ...None. MARINE...Small Craft Advisory until 6 PM EDT this evening for ANZ350. && $$ DISCUSSION...DS AVIATION...DW MARINE...DS |
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