A tornado slides across Oklahoma. Image courtesy NSSL/NOAA. Continued vigilance and quick response to tornado watches and warnings ... If the upper-level jet stream is strong in this storm ...

With a strong jet stream and cold air aloft ... western and central Oklahoma until 10 a.m. The counties under the tornado watch include Caddo, Canadian, Carter, Cleveland, Comanche, Cotton ...

Severe winter storms are impacting travel as Americans head home after the holidays. Newsweek's live blog is closed.

A supercell thunderstrom in Oklahoma ... And/or a tornado If a storm that meets these criteria are possible for an area, the Storm Prediction Center will issue a severe thunderstorm watch or ...