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nycsnow

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  1. Another strong storm likely impacts the region late Friday into Saturday with another round of moderate to heavy rainfall, and strong, to potentially damaging winds, along with a coastal flooding threat. Another southern stream trough will be moving onshore of the Pacific northwest midweek and track across the country, reaching toward the Great Lakes Region late in the week. With some of the global guidance the upper trough is becoming more negatively tilted during Friday, keeping the surface low a little farther to the west. Timing of the heaviest rainfall and highest winds remains Friday night into Saturday as a low level jet of 50-70kts moves through the region. Also, an occluded low will be moving over the region late Friday night into Saturday morning. Strong lift, and some instability, along with elevated CAPE up to 500 J/kg will allow for a chance of thunderstorms. Precipitable waters also increases late Friday night, up to 1.35 inches, and a period of moderate to heavy rainfall remains possible. The is the potential for another flooding event as WPC has placed most of the area in a slight risk for excessive rainfall. Finally, with the strong winds another high wind event is also becoming more likely. While there are a few days until the onset of this storm impacts are becoming more likely.
  2. Upton aviation calling for 40kt increasing to 50kt for city and coast Light and vrb winds increasing out of the SE this mrng. Gusts up to 40 kt possible toward 00Z, with city and coastal terminals having gusts up to 50 kt towards 04-06z. LLWS develops towards the eve push and continues overnight. Winds become wly around 12-14Z Wed.
  3. The reasoning behind the high wind warning and wind advisory. The main key feature is a low level jet maximum of near 100 kt that develops this evening at a height of around 4-8 kft. Model sounding BUFKIT profiles do not depict a strong inversion, as the thermal profiles appear to be close to isothermal. Winds just 1-2kft above the surface are shown to reach 50-60 kt across the coastal areas and with the heavy rain and aforementioned thermal profiles, much of this should get mixed down to the surface through downward momentum transport. The timeframe for this generally after 02Z Wednesday and before 09Z Wednesday for Western Long Island and New Haven CT west. The timeframe for this to the east generally after 03Z Wednesday and before 10Z Wednesday. Also, coinciding with this timeframe will be tremendous increase vertically with omega and the total southerly flow extending throughout the troposphere will increase the PWATS to well above 90th percentile climatology values. Models still conveying PWAT values near 1.4 inches maximum overnight into the coastal parts of the region.
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