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    Major winter storm developing from West Coast to Plains

    01:49
  • Non-stop snow pounds California's Sierra Nevada, closing down freeways

    03:09
  • Search underway for missing helicopter carrying 5 Marines

    02:19
  • California rains expected into the night as falling trees kill 2 people

    05:06
  • Weather as a wildcard: Frigid Iowa cold holds potential for discouraging caucus participants 

    02:35
  • Frigid temperatures could impact Iowa caucus turnout

    02:40
  • Iowa voter says Trump's poll lead would prevent him from caucusing over cold weather

    02:30
  • Heavy snow, winds create near white-out conditions in U.S.

    02:47
  • Millions of Americans across 48 states face winter weather alerts

    04:34
  • Heavy rain on both coasts could slow down travel on roads and airports

    02:21
  • East Coast faces flood warnings ahead of holiday travel

    02:28
  • Tornado threats and severe weather hitting Florida ahead of holiday travel

    02:38
  • Northeast faces heavy rain, wind as storm moves up coast

    02:48
  • Community begins cleanup efforts following deadly Tennessee tornadoes

    02:50
  • Clarksville mayor on tornadoes' aftermath: 'There is devastation everywhere'

    02:47
  • At least 6 dead after tornadoes strike Tennessee, leaving homes destroyed

    02:48
  • 'People are not getting water': Chef José Andrés describes 'mayhem' in Acapulco after Hurricane Otis

    05:30
  • How Hurricane Otis went from a tropical storm to a Category 5 in 24 hours

    03:58
  • Post-tropical cyclone Ophelia puts millions under coastal flood alerts 

    02:42
  • Lee, now a post-tropical cyclone, to make landfall near U.S.-Canada border

    05:02

NASA's game changer in weather forecasting

08:20

NASA's latest mission, SMAP, plans to change the face of the globe helping scientist to understand the impact of radical weather on the environment. Ed Schultz, Paul Douglas and Dr. John Bolton take an in depth look into the impact of the program.