A detailed timeline shows when storms could become severe in Houston before a sharp cold front ushers in much colder air Friday.

A pair of potent storms will sweep from Texas to the Great Lakes into this weekend, bringing flooding rain, severe thunderstorms and snow that may disrupt travel for well over 100 million in the central and eastern U.

Lubbock's weather keeps everyone on their toes, swinging from blistering summer heat to winter chills, with a history of tornadoes shaping both the city and storm research.

Here's when extreme heat, heavy rain, hurricanes and severe storms are most likely to occur during the year, based on climate data.