Winter storm
From Wikipedia, a free encyclopedia written in simple English for easy reading.
Snowstorms develop when warm, moist air collides with cold air. The warm, moist air mass and the cold air mass can each be 1000 km or more in diameter. Snowstorms affecting Northeastern United States often get their moisture from air masses moving north from the Gulf of Mexico and cold air from air masses coming down from the Arctic. In the Northwest U. S. warm, moist air from the Pacific Ocean cools when it is pushed upward by the mountains. But these are oversimplifications and many different factors can contribute to the direction of movement, moisture content and temperature of air masses. All of these differences affect the type and severity of the snowstorm.
(which turns into ice).
This short article needs someone to make it better.
You can help Wikipedia by adding to it.