Question: Tupeplots/ Animation

I was wondering if one could animate a tubeplot. if so i am trying to animate this tubeplot that i created so it can look like a tornado in action. tubeplot([20*t*cos(t+7),20*t*sin(t+7),20*t],t=0..20*Pi, radius=-100*exp(.00001*t), tubepoints=20, numpoints=100, color=grey); and if you can't does anybody know how I can animate a space curve similar to this to make it look like a tornado.
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