Yes, TORNADOS is a Scrabble word!

Letter values in Scrabble US: T 1, O 1, R 1, N 1, A 1, D 2, O 1, S 1.

Is it a valid word?

TORNADOS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a localized and violently destructive windstorm occurring over land characterized by a funnel-shaped cloud extending toward the ground
a purified and potent form of cocaine that is smoked rather than snorted; highly addictive

Also: crack cocaine.