More storms will hit the United States in a multiday severe weather event, after thunderstorms and tornadoes wreaked havoc in multiple states over the weekend and killed 28.

A severe thunderstorm watch is in effect for far north counties, including Grayson, Denton, Wise, Jack, Cooke and Collin, until 4 p.m. Large hail and damaging winds are the primary threat.Thursday is a First Alert Weather Day for the potential of strong to severe storms in the afternoon and evening hours.

Warm water is what fuels hurricane development.

"This outlook is a call to action: be prepared. Take proactive steps now to make a plan and gather supplies to ensure you're ready before a storm threatens."