MADISON, Wis. - While they look dangerous, as most funnels do, cold air funnels rarely touch the ground. But what causes these funnels to form and why don't they touch the ground and become tornadoes?
Not all funnel clouds in Oklahoma are dangerous tornadoes—some are cold air funnels. These form in the spring and fall under high-based showers or thunderstorms when colder air aloft moves over warmer ...
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