Just a few weeks ago, triple-digit temperatures and drought conditions were baking North Texas and drying up the Trinity River in Dallas. But overnight, rain pounded the region and filled up the river basin. 

The rain was so powerful that an apartment in downtown Dallas quickly ended up with two feet of water inside. 

It also caused power outages at the Dallas-Fort Worth airport on Monday afternoon, leading to more than 250 flight cancellations. 

In Utah's Zion National Park, torrential rains turned hiking paths treacherous, putting park goers at risk. One person was filmed clinging to a large tree trunk in fast-moving flood waters. The search continues for a 29-year-old woman from Tucson, Arizona, who was hiking with her friends when the storm hit. 

"There are more than 20 people working on a search and rescue operation, and they're working all along the length of Zion Canyon," said Zion National Park spokesman Jonathan Shafer. 

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