It's monsoon and wildfire season in the desert—which can cause a combination of deadly flash floods and debris flows.

Tucson post-fire debris flow was captured on video, and Pima County shared the unusual recording to its Twitter page.

Pima County explains that these occurrences are common after an area has been scorched, and the rushing water "causes large amounts of burned material." 

The black "gooey" stream is a combination of ash, sand, silt, rocks, and trees.

With thunderstorms and showers on the forecast for parts of Arizona, flash floods continue to be a threat as "there is sometimes little to no warning of impending flash floods or debris flows."

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