Severe storms threaten Texas and Colorado this week.

Over 4 million people in Texas are at risk of severe weather, including hail and tornadoes. The Upper Midwest and northern Plains are experiencing historic river flooding, with flood warnings in several states along the Mississippi River. Colorado is under a winter storm warning, with heavy snowfall expected in some areas. Red flag warnings are in effect in the Southwest due to high fire danger caused by low humidity and gusty winds.