After a massive storm Saturday caused flooding, evacuations, power outages, and mudslides in Utah, resident Vickie Reay said "it was like a black monster of lava."
CNN's Indra Petersons reports.
In Alpine City, about 100 people were briefly evacuated as the National Weather Service said three-quarters of an inch of rain fell in just 15 minutes.
Reay added, "It was 100 feet wide and it just got bigger and bigger and just picked up more momentum"
Lone Peak Police captured incredible images of a mudslide tearing through Utah county.
Residents in some neighborhoods reported more than three feet of water in their homes and the rain was so powerful that it actually collapsed the corner of a hill in Provo.
SEE THE MUDSLIDE ABOVE AND LEARN ABOUT CONSEQUENCES OF A HEAT WAVE IN THE MIDWEST