Overnight, a few showers and storms are lingering, especially Roanoke and southward. A few downpours in the heaviest cells can be expected. A few showers may even linger on Saturday, especially east of Roanoke.
A Canadian cold front is pushing through overnight and early Saturday. It may become hung up just east of us for a while Saturday into Sunday. But by Sunday and Monday mornings, Southwest Virginia is likely headed to our coolest low temperatures since the morning of June 28 — the day before summer 2012 had what is likely to be its defining weather day of intense heat and the evening derecho. That morning, it was 52 at Blacksburg and 59 at Roanoke. Since then, Roanoke has been no cooler than 64 and Blacksburg no cooler than 58, both on Aug. 1. On the whole, the Virginia weather pattern isn’t going to change greatly in coming days, with 80s highs lingering for many from Roanoke eastward through the weekend, and just about all the region back in the 80s most of next week, with lows generally in the 60s. But on a national scale, there is a definitely regime change occurring that will unseat the central U.S. heat dome and replace it with repeat shots of Canadian air pouring into the northern Plains and Upper Midwest. We will see occasional cold front passages during the next week or two, each one lifting the chance of showers and storms, and also keeping extreme heat in check. The next is due to arrive about Tuesday or Wednesday. Some of that much cooler Canadian air might even drain our way at some point for a day or two.