Signs of a Tornado

  • Strong, persistent rotation in the cloud base.
  • Whirling dust and or debris on ground underneath cloud base.
  • Tornadoes do not always have visible funnels – can be rain wrapped.
  • Hail or heavy rain followed by either absolute calm or extreme wind shift.
  • Loud continuous roar or rumble unlike thunder that fades within seconds.
  • Visible small, bright, blue and green to white power flashes at ground level.

Source: http://www.okc.gov/tornado/

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