An active pattern continues for portions of the Mid-Atlantic Friday into Saturday. The pattern is similar to East Coast snow storms with a ridge in western and central portions of the United States, a ridge in eastern Canada, a trough in the eastern United States, as well as a ridge in Greenland. These factors point to a rare summer coastal storm developing late tomorrow into the day on Saturday.
This storm will track off the Delmarva Peninsula, and meander there for a while before weakening and moving out into the open waters. With PWAT values over 2 inches and dew-points temperatures in the lower to mid 70 degrees across portions of the region Friday night, as shown in the images above (credit: WeatherTap.com), there is plenty of moisture to work with which will lead to rounds of heavy showers and some embedded thunderstorms. National weather service offices have issued flash flood watches across portions of Pennsylvania, West Virginia, northern Virginia, Maryland, central and southern New Jersey, and Delaware, for flooding rains as shown in the image above. A general 2-4 inches will accumulate across the area with locally heavier amounts likely. Breezy winds on the coast will also be a threat as it intensifies and tightens up the pressure gradient along the coast.
One thing is for certain, if this type of pattern, and much of this summer’s overall pattern were in place this past winter, the Northeast and Mid-Atlantic would have experienced a more active and colder winter. This also begs the question; will this pattern have any influence on this winter?
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©2017 Forecaster Joseph DeLizio