Area Forecast Discussion
Issued by NWS Upton, NY

Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
000 FXUS61 KOKX 140245 AFDOKX Area Forecast Discussion National Weather Service New York NY 1045 PM EDT Fri Oct 13 2017 .SYNOPSIS... A surface trough shifts into the area tonight and remains nearby through Saturday night. Abnormally mild and summer-like on Sunday ahead of a cold front that will cross the region Sunday night. High pressure then dominates for the work week with dry weather and near seasonable temperatures, though with gradual warming by late in the week. && .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
-- Changed Discussion --
The radar was quiet at 930 pm, with stlt showing any inferred lift mainly off the delmarva coast. As a result, the timing of rain chances has been slowed slightly. Otherwise the fcst was on track. A surface trough shifts into the area tonight. Moisture convergence along this boundary along with lower level omega and isentropic lift will bring increasing chances of light rain mainly after midnight. Models have been trending deeper with this moisture and stronger with the lift, so decided to not mention drizzle in the forecast. Best overall rain chances will be in the vicinity of the city and NE NJ.
-- End Changed Discussion --
&& .SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/...
-- Changed Discussion --
The trough shifts east Saturday and Saturday night. Moisture convergence and lift move with it. Best overall chances of rain during the day will be in the morning and over LI and CT. Guidance blend for high temps, which is cooler than the previous forecast, looked good considering the anticipated cloud cover. Lower chances of rain during Saturday night, with the intensity becoming more likely to be light or even possibly drizzle late at night. Areas of fog probably develop overnight as well.
-- End Changed Discussion --
&& .LONG TERM /SUNDAY THROUGH FRIDAY/...
-- Changed Discussion --
The NWP suite of models including the 12Z GEFS are in reasonable agreement through next week. There have been only minor changes in the forecast since early this morning with the light potential precipitation event Sunday night associated with a cold FROPA. Otherwise, dry/fair weather prevails through the work week. Details: Southwest flow ahead of the cold front is fairly strong with gusts likely into the mid to upper 20`s (mph) range on Sunday with highest gusts across the coast. Winds shift to Northwest overnight with the passage of the cold front. Have raised POPs to likely with support of the GFS and EC 12Z deterministic runs as well as surrounding NWS WFOs for the overnight. NAM and SREF suggest a lower POP, but regardless - fully expect less than 1/4". Winds are gusty again on Monday from the northwest with cold advection. Otherwise, temps on Tuesday only top out near 60 - about 5 degrees below normal, but then recover to around 70 by Thursday with tranquil conditions. Warmer yet for Friday.
-- End Changed Discussion --
&& .AVIATION /03Z SATURDAY THROUGH WEDNESDAY/...
-- Changed Discussion --
High pressure near the Canadian Maritime and extending into the terminals continues to retreat through Saturday, while a wave of low pressure off the North Carolina coast moves slowly north to the DELMARVA by Saturday afternoon and then weakens and moves south of Long Island. MVFR ceilings 1500 to 2500 feet will slowly lower with a steady light rain developing overnight. Ceilings likely become IFR around 09Z or later, especially along the coast. The rain ends late Saturday morning west, and during the afternoon east, with conditions improving to MVFR. Toward the end of the forecast period conditions will lower once again to IFR with fog developing. Winds will be E to NE 10 kt or less through most of the forecast period with winds becoming light and variable late Saturday afternoon. .OUTLOOK FOR 00Z SUNDAY THROUGH WEDNESDAY... .Saturday Night...IFR conditions with low ceilings and fog. .Sunday...Improving to VFR in the morning, then chance of showers at night with MVFR conditions. SW winds G25KT. .Monday...Chc early AM showers, otherwise VFR. NW winds G20KT. .Tuesday and Wednesday...VFR.
-- End Changed Discussion --
&& .MARINE... Have converted the general SCA on the ocean waters to a SCA for hazardous seas. Also have extended it through Saturday afternoon with collaboration from the surrounding offices. The SCA might need to be extended into at least a portion of Saturday night, but confidence in occurrence and duration is not high enough at this time. All other waters will have sub-advisory conditions prevailing through Saturday night. SCA conditions appear likely Sunday into Monday on the Ocean Waters ahead and in the wake of a cold front. A brief period of SCA gusts are possible on the Sound and Bays as well as pre and post frontal overnight Sunday into early Monday. Tranquil conditions are expected from Tuesday into the end of the week. && .HYDROLOGY... No hydrologic issues expected through the end of next week. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. NJ...None. MARINE...Small Craft Advisory for hazardous seas until 6 PM EDT Saturday for ANZ350-353-355. && $$ SYNOPSIS...JC/Tongue NEAR TERM...JMC/JC SHORT TERM...JC LONG TERM...Tongue AVIATION... MARINE...JC/Tongue HYDROLOGY...JC/Tongue

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.