1. Day or night - Loud, continuous roar or rumble, which doesn't fade in a few seconds.
Visual
2. Strong, rotation in the cloud base.
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1. Day or night - Loud, continuous roar or rumble, which doesn't fade in a few seconds. Visual 2. Strong, rotation in the cloud base. |
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4. Hail or heavy rain followed by either dead calm or a fast, intense wind shift. Many tornadoes are wrapped in heavy precipitation and can't be seen. |
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5. Night - Small, bright, blue-green to white flashes at ground level near a thunderstorm (as opposed to silvery lightning up in the clouds). These mean power lines are being snapped by very strong winds, maybe a tornado. |
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6. Night - Persistent lowering from the cloud base, illuminated or silhouetted by lightning. Want to do some more research? After typing in what you want to research, click go. |