U.S. weather whiplash as heat dome, polar chill and storms collide

Forecasters warn of a rare, multi-system weather assault across the U.S.: a Southwest heat dome could push triple‑digit heat, a polar-vortex chill will dip temperatures into the Midwest and East, two back‑to‑back snowstorms including a potential bomb cyclone may slam the northern tier and Great Lakes, and Hawaii faces heavy rain from an atmospheric river while the jet stream—linked to Arctic warming—drives extreme swings. Some areas could see record highs while others endure record lows as spring approaches.