Area Forecast Discussion
Issued by NWS Upton, NY

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000 FXUS61 KOKX 310311 AFDOKX Area Forecast Discussion National Weather Service New York NY 1111 PM EDT MON MAY 30 2016 .SYNOPSIS... A weak cold front passes tonight. High pressure then builds down from southeastern Canada from Tuesday through Thursday, then retreats to the northeast Thursday night. A cold front approaches from the west on Friday, then moves across the region early this weekend. && .NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
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A narrow line of showers extending from srn NJ through srn RI has developed late this eve. Have adjusted pops to account for this which HRRR has somewhat of a handle on. Otherwise...hourly temps and dewpoints were generally too low and adjusted based on obs and trends for the next few hours. Fog and stratus continue to improve across Long Island and se CT...however think this is temporary and should come back down with temps approaching their dewpoints. Front moves across the area overnight with any remaining showers shifting offshore. Mos blend for overnight lows with temps in the 60s.
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&& .SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/... It appears that weak surface front stalls and weakens nearby Tuesday. Mid and upper level trough passes to the north across New England during the day. Drier air will filter in from the northwest as high pressure builds from canada. In general, expect dry conditions with sunshine during the day, and partly cloudy to mostly clear skies at night. Daytime highs will range from the mid 70s to mid 80s, per MOS. Lows Tuesday night should range from the 50s across the interior to the mid 60s in and around NYC under better radiational cooling conditions. There is a moderate risk of rip current development at Atlantic facing beaches on Tuesday. && .LONG TERM /WEDNESDAY THROUGH MONDAY/... High pressure on Wednesday results in a sunny day. With an onshore flow and limited mixing depth, have gone close to superblend for high temps as MET mos looked too warm and MAV mos looked too cool. High pressure shifts farther east on Thursday but should still keep all rain associated with the remnants of Bonnie well to our south. Winds and mixing depth will be similar to Wednesday`s, but maybe a little more in the way of cloud cover. High temp forecast is therefore slightly cooler than Wednesday. A slow-moving cold front then brings low chances of showers to roughly the western half of the cwa. Better overall chances then arrive Friday into Friday night as the front moves through, but pops are capped at chance for now. Timing of the frontal passage is still in question, but kept a slight chance of showers on Saturday. Saturday could however end up being entirely dry across the area. Enough CAPE is progged in the area to mention thunder Friday through Saturday. Friday`s high temps look to be at or a couple degrees below normal, with Saturday being a few degrees higher than normal. Upper troughing over the region begins on Sunday and lasts into Monday. This will help a broad surface low shift into the area during this period. Whether or not a secondary surface low forms and passes nearby is uncertain, but the parent low and associated fronts present chances of rain/showers/thunderstorms during this period. && .AVIATION /03Z TUESDAY THROUGH SATURDAY/...
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A cold front will approach late tonight moving across early Tuesday. Conds have improved to VFR across Long Island and se CT with IFR only remaining at KBDR. Think this is temporary with decreasing dewpoint depressions and conds should come back down to MVFR or IFR overnight...however the timing could be off a few hours. Meanwhile...MVFR has develop at the city terminals. This should hold until late tonight when winds shift more sw with VFR returning. Some showers from remnants of Bonnie may impact KISP/KGON until late tonight. moderate to high confidence in wind forecast. sea breeze develops at the coast tue aftn. .OUTLOOK FOR 00Z Wednesday through Saturday... .Tuesday Night-Wednesday Night...VFR. .Thursday...Mainly VFR. E winds G15-20kt. .Thursday Night...Chance of showers with brief MVFR conditions. .Friday-Saturday...Chance of showers and thunderstorms with brief MVFR conditions.
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&& .MARINE... Fog over the eastern waters will be dense. Dense fog advisory continues through the entire night. As a weak front approaches and stalls over the waters through Tuesday, expect southerly winds to remain fairly light. Winds turn to the north Tuesday night as high pressure builds. For now, it appears that there will not be a significant enough swell to bring seas to SCA levels through Tuesday night. Sub-sca conditions are expected Wednesday with winds less than 20 kt and ocean seas 3 to 4 ft. An easterly wind increases on Thursday, building seas up to 5 ft on the ocean along with some gusts up to 25 kt possible. Winds then become lighter Thursday night and Friday, however remain onshore. A lingering swell could therefore prolong 5 ft seas into this period. Otherwise, sub-sca conds are likely through Saturday. && .HYDROLOGY... Widespread significant rainfall is not expected through Tuesday night. A few heavier showers and possible thunderstorms could result in local urban and poor drainage flooding this evening. Thereafter, no widespread significant rainfall is expected through the upcoming weekend. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. NJ...None. MARINE...Dense Fog Advisory until 6 AM EDT Tuesday for ANZ330-340-345- 350. && $$

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