What could indicate that a tornado is happening?

Question

light drizzle

sunny skies, cool weather

dark storm clouds

high winds, hail and debris falling

overcast skies

Answer 1

The dark storm clouds, high winds, hail and debris falling, and overcast skies could all indicate that a tornado is happening. Additionally, a distinctive funnel-shaped cloud extending from the base of the storm cloud towards the ground is a clear visual indication of a tornado.