To explain why snowflakes look the way they do, we first need to understand how they form. For a snowflake to form there ...
The polar vortex of ultra-cold air usually spins around the North Pole, but it sometimes plunges south into the U.S., Europe ...
Much of the U.S. is being blasted by ice, snow and wind, as the polar vortex that dipped south over the weekend is keeping an ...