Temperatures could fall below -20 F across certain parts of North Dakota and Minnesota.

Major cities across the Northeast and Midwest are facing temperatures 10-20 degrees below average, according to forecasters.

A chilling polar vortex is set to bring snow and ice to the South and East this week. We show where.

High above our heads, around 5 to 7 miles above the Earth’s surface, a powerful ribbon of air races from west to east. This is the jet stream; a fast-flowing current of air that plays a crucial role ...

The jet stream, or any wind, is the result of differences in surface temperature. In simple terms, warm air rises, creating low pressure, and cold air sinks, creating high pressure. Wind is the ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) At the same time, every hurricane that formed, including the three powerful Category 5 ...