Temperatures are soaring across much of the country during the final week of August before the Labor Day holiday weekend arrives, with a threat of downpours and severe weather from Texas to the Carolinas. AccuWeather Lead Long-Range Forecaster Paul Pastelok says the large heat dome of high pressure that’s building from the Midwest to parts of the East will break down this week and over the weekend as a strong cold front slides to the southeast. “A strong cold front will move through the eastern third of the nation over the holiday weekend,” he says. “Showers and a few strong, gusty thunderstorms are likely,” he says. “The big travel day on Friday will feature heavy showers and gusty thunderstorms from the Midwest to the South-Central Plains along the front.” Meantime, a heat wave will continue baking the Midwest, with temperatures 8-14 degrees above historical averages, and will combine with high humidity.