Notice the GFS model analysis for late Thursday of this week to your top right. Turn your attention to the western Atlantic Ocean. where a large area of high pressure has settled into that area. This high was broad and strong, deflecting weather systems and at the same time, pumping in a lot of warm air over the central and eastern United States. This high is, as you can expect, is unusual for this time of the year. It allowed many locations, including several here in West Virginia to reach record highs for Clarksburg, Elkins and Morgantown.
This pattern will begin to break down as we head into the weekend. You can see on the GFS model to the bottom right that by Monday, the high pressure is gone, replaced by low pressure that slowly moves up the east coast. This will allow some cooler and more seasonal air into West Virginia. This cooler pattern should hold for much of next week.