"Extreme Weather Alert: Roller Coaster Temperatures and Flash Freeze Warning in the U.S."

The U.S. is experiencing a dramatic shift in temperatures, with record highs giving way to a powerful cold front, severe thunderstorms, and potential snowstorms. Millions are set to experience a temperature roller coaster, with record warmth returning before a significant drop in temperatures. Severe thunderstorms, including the risk of tornadoes and large hail, are expected in the Midwest and Great Lakes, while the East Coast will face heavy rain and wind. California is also bracing for a major snowstorm, potentially bringing 5 to 12 feet of snow to the Sierra region.