To be prepared for a tornado, it is critical to be familiar with tornado warning signs.  Although tornadoes vary greatly in their appearance and provide little or no warning, the following signs can indicate that a tornado could be imminent.

• A dark, often greenish sky.
• A wall cloud, particularly if it is rotating.
• Large hail. Although not always, storms that produce tornadoes frequently produce large hail as well.
• A loud roar, similar to the sound of a freight train.
• Tornadoes may occur near the trailing edge of a thunderstorm and be quite […]

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