- Tornado sequence starts with the first signs of a funnel cloud (TVS)
- W910302W
- Tornado sequence, 1 of 22. The flanking line of a supercell extends out the backside (west) of the storm as a dark cloud base. Air rises along this axis and has begun to rotate within the storm. The first signs of a TVS (Tornado Vortex Signature) are becoming visible as a tornadic funnel cloud that is descending from the base. It went on to become a tornado.
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