Area Forecast Discussion
Issued by NWS Upton, NY
Issued by NWS Upton, NY
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734 FXUS61 KOKX 092122 AFDOKX Area Forecast Discussion National Weather Service New York NY 422 PM EST Sat Nov 9 2024 .SYNOPSIS... High pressure moves overhead this evening and then offshore late tonight. The high will remain in control on Sunday as a frontal system approaches from the west. A cold front moves through the area Sunday night into Monday. Another cold front will move through Monday night, followed by strong high pressure Tuesday and Wednesday. A frontal system may move through on Thursday, with high pressure again following for Friday and Saturday. && .NEAR TERM /UNTIL 6 AM SUNDAY MORNING/... An upper level ridge continues to build in while high pressure moves overhead this evening. The ridge axis will be just about over the area by early Sunday morning, with high pressure just starting to shift offshore. Winds will continue to weaken this evening and become light and variable or calm overnight. These winds combined with clear skies will allow for optimal radiational cooling conditions. There is a bit of uncertainty the second half of the night as some mid and high level clouds move in from the west. Went a few degrees higher than the previous forecast, but frost/freeze headlines remain unchanged due to uncertainty. Smoke from a fire on the border of Orange and Passaic continues to be seen on satellite spreading towards the southeast. The NYS DEC has issued an Air Quality Health Advisory for NYC, Rockland and Westchester until midnight Sunday night. The NJ DEP has issued an Air Quality Action Day for all of northeast NJ until midnight tonight. && .SHORT TERM /6 AM SUNDAY MORNING THROUGH MONDAY/... A return flow sets up Sunday morning as high pressure shifts offshore. A shortwave trough lifts into the Great Lakes Region along with it`s associated surface low. The pressure gradient tightens through the day and a gusty southwest flow can be expected by the afternoon. Temperatures are expected to rise into the upper 50s to low 60s. Expect increasing dewpoints and sky cover through the day. A cold front approaches Sunday night, with a plume of plume of Gulf moisture out ahead of it. This will bring the first widespread rain event to the area in over a month. Went later than the NBM and some CAMs with the start time of any PoP due to forecast soundings showing plenty of dry air that will have to be overcome. Most of the rain will fall overnight Sunday night, with about 0.25 to 0.50 inches expected. The airmass change with this first cold frontal passage will be more of a moisture change than a temperature change. While dewpoints will drop on Monday, highs will be in the 60s. The real shot of cold air will come later on Monday night. && .LONG TERM /MONDAY NIGHT THROUGH SATURDAY/... An amplifying upper level trough moving across the Northeast will drag a sfc cold front across Mon night. The front will come across dry, with winds shifting from W to NW and becoming gusty (up to 25 mph) late Mon night into daytime Tue as high pressure builds from the Great Lakes. As the high passes to the north, winds will veer N Tue night, then NE-E Wed into Wed night. Temps on Wed may not make it out of the 50s across some interior spots, with highs in the lower 50s for most of the area. There is some uncertainty on the timing and strength of a frontal system later in the week as the next trough approaches from the west. NBM appears to be closer to the GFS timing with chance PoP daytime Thu, and only slight chance for Thu night, while the latest ECMWF timing is much slower and weaker, mostly passing to the south underneath a closed low over the Atlantic near the Canadian Maritimes. At any rate, high pressure should follow in its wake to close out the week, with high temps slightly above normal. && .AVIATION /21Z SATURDAY THROUGH THURSDAY/... High pressure builds over the region into tonight, sliding offshore Sunday. Mainly VFR forecast, though wildfire smoke may continue to lower vsbys into late day to MVFR, primarily around NYC terminals. NW winds near 10 kt thru remainder of the day, gusting toward 20 kt at times. Gusts subside by late afternoon, and speeds lower under 5 kt this evening as high pressure moves overhead. Flow goes variable overnight, then becomes SW on Sunday, speeds up to 10 kt during the day with gusts toward 20 kt in the afternoon. Building cloud cover on Sunday with gradually lowering cigs. Any rain likely holds off until Sunday evening, perhaps sneaking into KSWF just prior to 00Z Monday. NY Metro (KEWR/KLGA/KJFK/KTEB)TAF Uncertainty... End time of wind gusts could be off by a few hours. Haze and smoke from nearby brush fires may lower vsbys at times into this afternoon, mainly at KTEB, but can`t rule out at KEWR or KLGA. OUTLOOK FOR 18Z SUNDAY THROUGH WEDNESDAY... Sunday PM: VFR thru the afternoon, then becoming MVFR with rain developing in the evening. MVFR or lower in rain at night. SW wind gusts 15-20 kt late afternoon into night. Monday: MVFR with rain ending during the morning, eventually becoming VFR. SW-W winds 10 to 15 kt, gusts 15-20 kt. Gusts diminishing after sunset. Tuesday: VFR. NW winds near 10 kt with gusts 15-20 kt, becoming more northerly at night. Gusts mainly during the day into early evening. Wednesday: VFR. Thursday: MVFR or lower with rain early. Detailed information, including hourly TAF wind component forecasts, can be found at: https:/www.weather.gov/zny/n90 && .MARINE... Sub-SCA conditions are expected on the waters through Sunday. Winds continue to increase through the day though, and SCA conditions return by Sunday evening/night. A strengthening southwesterly flow will peak Sunday night at 20 to 30 kt. Waves on the ocean could reach 8 to 10 ft. There may be a lull in SCA cond for Mon night on the non ocean waters, but then SCA cond likely for all waters Tue into Tue evening, with NW-N flow gusting to 25-30 kt and ocean seas up to 5 ft. Quiet from daytime Wed into Thu with high pressure passing to the north and then perhaps a weak frontal system approaching on Thu. && .FIRE WEATHER... Red Flag Warning for elevated fire danger remains in effect through 6PM for the entire area based on anomalously dry/drought conditions, meteorological factors, and coordination on available fuels with fire officials/land managers. A Red Flag Warning is also in affect for southern CT for Sunday. Winds increase again on Sunday. By the afternoon winds will be sustained 10 to 15 mph, with gusts up to 25 mph. Min RH values will be around 30 to 40 percent. Dry cond with min RH 25-35% likely for Tue and Wed, with NW winds also gusting up to 25 mph on Tue as well. Min RH looks to be higher later in the week (45-55%) with lighter winds. && .HYDROLOGY... Moderate drought conditions have developed across the area per US Drought Monitor. Streamflows are generally below the 25th percentile of normal for this time of year. There are no other hydrologic concerns through mid next week. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...Red Flag Warning until 6 PM EST this evening for CTZ005>012. Red Flag Warning from 9 AM to 6 PM EST Sunday for CTZ005>012. Freeze Warning from 10 PM this evening to 9 AM EST Sunday for CTZ009>012. NY...Red Flag Warning until 6 PM EST this evening for NYZ211>213. Freeze Warning from 10 PM this evening to 9 AM EST Sunday for NYZ078>081. Frost Advisory from midnight tonight to 9 AM EST Sunday for NYZ071-177-179. Air Quality Alert from midnight tonight to midnight EST Sunday night for NYZ067-068. Air Quality Alert until midnight EST Sunday night for NYZ069>075-176-178. NJ...Red Flag Warning until 6 PM EST this evening for NJZ002-004- 006-103>108. Air Quality Alert until midnight EST tonight for NJZ002-004- 006-103>108. Frost Advisory from midnight tonight to 9 AM EST Sunday for NJZ104. MARINE...Small Craft Advisory from midnight Sunday night to 1 PM EST Monday for ANZ331-335-338. Small Craft Advisory from 6 PM Sunday to 1 PM EST Monday for ANZ332-340-345-355. Small Craft Advisory from 6 PM Sunday to 6 PM EST Monday for ANZ350-353. && $$ SYNOPSIS...BG/JT NEAR TERM...JT SHORT TERM...JT LONG TERM...BG AVIATION...DR MARINE...BG/JT FIRE WEATHER...JT HYDROLOGY...BG/JT