The weather pattern across the United States and Canada remains highly active this week, with two major stories dominating the forecast. Dangerous, long-lasting heat continues across much of the South before expanding into the western United States by the weekend. At the same time, repeated rounds of thunderstorms will bring the threat of flash flooding and severe weather from the Mid-Atlantic and Northeast to parts of the Midwest and Gulf Coast. Residents across these regions should stay weather-aware as heavy rain, damaging winds, and dangerous heat create multiple hazards over the coming week.