• Polar vortex behind U.S. big chill explained

    ByTW

    The chilling weather phenomenon that hit much of the U.S. in January is explained by scientist Eric Fetzer using data from NASA's AIRS instrument. 

    This movie of temperature observations from NASA's Atmospheric Infrared Sounder (AIRS) instrument on

  • Arctic blast hits Canada and USA

    ByChillymanjaro

    "Polar vortex" takes aim on United States with dangerous life-threatening temperatures. National Weather Service warned that much of the US will see coldest temperatures in about 20 years as an arctic cold front descends.

    A fresh blast of arctic air