Severe thunderstorms threaten High Plains, Rockies, and Great Basin this weekend.

An Omega block pattern is transitioning to a Rex block pattern over the Great Lakes, which will "trap" an area of disturbed weather over the Rockies, resulting in daily chances for showers and thunderstorms. Severe weather alerts have been issued for millions from Wyoming to Texas, with large amounts of hail and lightning strikes reported. The severe weather threat will continue for several days, with daily thunderstorms forecasted for the Rockies. The Omega block pattern looks to stick around for the foreseeable future.