Supercell thunderstorms are dangerous storms that unleash large hail, roaring winds and powerful tornadoes.

(CNN) — Much of the United States is experiencing prolonged and extreme cold weather, with recent winter storms, dangerous windchills and record low temperatures affecting millions of people. As ...

(CNN) — A major winter storm is spreading heavy snow and damaging ice across a large portion of the United States. Extremely cold temperatures will only worsen the storm and increase its danger. The ...

Dangerous, critical fire weather conditions persist Wednesday after more than a dozen new wildfires torched tens of thousands of acres and forced evacuations in the Plains amid bone-dry conditions and ...

(CNN) — A powerful winter storm swept across the central and eastern United States, knocking out power and snarling travel during one of the busiest stretches of the holiday season. The wide-ranging ...

(CNN) — Punxsutawney Phil, the groundhog weather icon, saw his shadow when he was plucked from his warm burrow and thrust out into the frigid air Monday morning. According to Phil, that means six more ...

(CNN) — The US is a nation divided, with frigid conditions, snow and ice entrenched east of the Rockies all the way into Florida, and record warmth and paltry snowfall in the West. The dichotomy has ...