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    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
  • Relatives fear for family and friends after deadly earthquake in Morocco

    05:10

Severe flood warnings in effect for east coast

04:36

Hurricane Joaquin may be tracking away from the east coast, but the storm is expected to generate rainfall levels in the southeast that have not been seen in 200 or maybe even 500 years. NBC's Sarah Dallof and MSNBC meteorologist Bill Karins report the latest.