Signs of a Tornado
- Strong, persistent rotation in the cloud base.
- Whirling dust or debris on the ground close to cloud base.
- Hail or heavy rain followed by a dead calm or a fast, intense wind shift.
- Loud, continuous roar or rumble.
- At night, small, bright blue-green to white flashes at ground level near a thunderstorm (this could be power lines snapped by strong wind).
