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    Tennessee tornadoes leave tens of thousands without power

    03:17
  • Tens of millions under flood alerts as storm system moves across Northeast

    01:15
  • Deadly tornadoes carve destructive paths through Tennessee neighborhoods

    03:07
  • Storm hazards put 50 million at risk of flooding on East Coast

    01:49
  • Tornadoes rip through Nashville leaving at least 6 dead

    01:29
  • Severe storms cause damage in Tennessee as massive system moves across U.S.

    01:46
  • Major storm takes aim at entire East Coast this weekend

    02:02
  • Al Roker shares exclusive look at high-tech weather center in NY

    03:38
  • Deadly flooding in Pacific Northwest after relentless rain

    01:54
  • Relentless rain creates flooding emergency in Pacific Northwest

    02:51
  • Millions in Pacific Northwest under flood alerts as multiple storms hit region

    01:40
  • Deadly eruption of Indonesia's Mount Marapi volcano traps climbers

    00:41
  • Heavy snow hits Northeast as cold temperatures sweep across the country

    03:19
  • Fierce winds take down National Christmas tree in Washington, DC

    03:21
  • Millions of Americans hit with first winter blast

    02:12
  • First blast of winter impacts millions from Midwest to Northeast

    03:06
  • Stormy weather could delay Thanksgiving weekend travel

    01:29
  • Winter weather alerts across parts of U.S. as TSA braces for record-breaking holiday travel day

    01:51
  • Thanksgiving travel forecast: What to expect across the US

    01:38
  • Deadly landslide strikes Alaskan island community after rain and windstorm

    00:20

Okla. tornado draws comparisons to 1999 storm

01:57

Before yesterday’s tornado touched down, when Moore, Okla., residents referred to “the big one” they were talking about the F5 tornado that tore through the area back in 1999. TODAY’s Al Roker talks about the devastation left behind by that storm.