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    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
  • New tremors in Morocco as death toll tops 2,100

    02:05

Two tornadoes touch down in Texas

02:36

NBC's Bill Karins talks about the "significant damage" made by the two tornadoes.