The World Cup is getting underway under a sharply split weather pattern across the United States. These maps show expected impacts.

A sprawling and chaotic weather pattern is sweeping across the United States this week — bringing severe storms and flash flooding to some regions while others bake under an early-season heat wave.

There is a major weather pattern change underway across the U.S. As we get into next week, the storm track looks really interesting. Major upper-air pattern changes are quite normal. Sometimes we have ...

Add Yahoo as a preferred source to see more of our stories on Google. An Omega Block Is Gripping The Country This Week. A weather pattern named for the Greek letter omega is guiding the United States' ...