A Black Stream Of 'Goo' Ripped Through This River Park In Tucson Again (VIDEO)
What is that!?
It's monsoon and wildfire season in the—which can cause a combination of deadly flash floods and debris flows.
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 thefor parts of , flash floods continue to be a threat as "there is sometimes little to no warning of impending flash floods or debris flows."