A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of the arctic blast.

According to the NWS, the Arctic polar vortex is a powerful band of west-to-east winds that develops in the stratosphere, about 10 to 30 miles above the North Pole, during the winter season. It is ...

Weather maps are created by plotting or tracing the ... Use of surface analyses began first in the United States, spreading worldwide during the 1870s. Use of the Norwegian cyclone model for ...

A winter storm is forecast to spread ice and snow across portions of the central and eastern U.S. today. Will it affect Texas ...

View the latest weather forecasts, maps, news and alerts on Yahoo Weather. Find local weather forecasts for Welcome, United States throughout the world ...

Weather maps are created by plotting or tracing the ... Use of surface analyses began first in the United States, spreading worldwide during the 1870s. Use of the Norwegian cyclone model for ...