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There's going to be more snow in California and then over the Rockies and into the Plains. But it's parts of the Gulf Coast and Southeast that could see the most severe storms on Christmas Day.

Heavy snow and strong winds are making travel tough from Iowa into Minnesota and Wisconsin. As the storm moves east, it's expected to bring rain and lake-effect snow to parts of the East.

May is historically the most active month for tornadoes in the U.S.

The Centers for Disease Control and Prevention says there's not yet enough scientific evidence to fully endorse the idea, but the agency is warming up to people donning helmets when severe weather threatens.

Last year, tornadoes claimed the lives of more than 500 people in the U.S. Some safety advocates say protecting your head with a sturdy helmet could help reduce injuries and deaths. The Centers for Disease Control and Prevention says it's unaware of evidence in favor of helmets, but it acknowledges people may want to use them to protect themselves against head injuries.

Emergency responders are running headlong into a growing phenomenon: roads bottled up by swarms of tornado chasers.

Several early morning tornadoes ripped through southeastern Colorado causing severe damage to multiple homes and buildings near Lamar, about 200 miles…

One year ago this week, powerful tornadoes killed more than 300 people in the Southeast. Experts now say that some tornado deaths could be prevented if people add one more step when taking cover: wear a helmet. But official guidelines from the CDC call for people to use their hands to protect their heads.

The deadly twister was spawned by some 120 storms over the weekend that swept through the Midwest, leaving a path of destruction.

Over the weekend, tornadoes ripped through several states, killing at least five people in Oklahoma and causing millions in damage to communities. Among the hardest hit areas was Wichita, Kan., which has seen its share of hardship over the past several years.