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Watch Now: Video shows power of monsoon storm over Tucson
A microburst over the Tucson's Foothills area was captured in a video Friday from the University of Arizona Hydrology and Atmospheric Sciences. A microburst is the core of a thunderstorm that drops down in a precipitation column and produces strong wind and heavy rain, says  Mike Leuthold, the manager at the Regional Weather Modeling Program.
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The fissure opened up to 9 to 10 feet deep and a couple feet wide, closing a five-mile stretch of the main route between I-10 and Douglas.
After a Monday deluge that saw rainfall of more than an inch in some areas, a flash-flood warning is in effect for Tucson and most of Southeastern Arizona through Wednesday evening.
