Another powerful system is expected to sweep across a wide swath of the U.S., bringing heavy rain to Southern California, heavy snow to parts of the West and Midwest, and more snow and freezing rain to the Northeast.

Back-to-back storm systems will bring the potential for severe weather and flooding to the South over the next several days. Strong thunderstorms could produce damaging winds, large hail and isolated tornadoes,

We are tracking the return of the polar vortex next week as a wavy jet stream brings a blast of Arctic air to the Great Lakes.

A week-long, polar vortex-related Arctic outbreak rivaling any seen so far this winter is slated to bring frigid conditions to much of the U.S. east of the Rockies next week. Threat level: The Arctic air is likely to send temperatures plunging to at least 30 degrees below average for mid-February across the Midwest and Plains states,