A major, multi-day heat wave is taking shape across the middle of the country, threatening to bring the most widespread 90-degree weather seen so far this year. The expanding heat dome will stretch from the Plains through the Midwest and push into the Eastern states over the coming days, while a rin g of severe thunderstorms […] Sweating Into The 4th: Massive Heat Dome Set To Smother Central US Before Holiday Weekend ...read more read less