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Weather experts say two powerful fronts collided creating a ferocious weather system last night.

It caused the destruction of several mobile homes in a community near Ironwood and Germann in San Tan Valley

"We've been analyzing it all day and taking a look at data," said Charlotte Dewey with the National Weather Service. We did actually do a storm survey and went out there to look at the damage."

Meteorologists said a dust storm coming up from the Tucson area collided with an outflow heading northeast. The conditions were perfect for a "gustnado," a term used to describe a whirling columns of air that form on the leading edge of a gust front.

An intense downburst of winds called a microburst also added to the ferocity of this system.

"The colliding air masses and the outflows is very common," said Dewey. "Happens all the time with thunderstorms."

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