In case you haven't heard, there is a summer polar vortex coming late next week just in time for Coal Mine. Couldn't be a better situation. Totally dry, unseasonably cold air is coming down from Canada. N Va temps will be highs in the mid 80's and lows in the 60's. East buttcrack Pennsylvania will 10 degrees less in the hills. Plan on October type of weather mid July, and bring a warmer sleeping bag than you might think.