Forecasters are warning of another day of heightened risk of dangerous tornadoes in the Midwest on and are telling people in south Texas they may experience triple-digit temperatures — and that's with four weeks to go before summer starts. Excessive heat, especially for May, is the danger in south Texas, where the heat index is forecast to approach near 120 degrees F (49 degrees C) during the weekend. The region is on the north end of a heat dome that stretches from Mexico to South America. That is according to National Weather Service meteorologist Zack Taylor. Sunday could be even hotter, with record-setting highs for late May forecast for Austin, Brownsville, Dallas and San Antonio.
