First Karen and then Jerry, both short-lived tropical storms fizzled in cooler Atlantic waters. Here's what's being watched now.

Downgraded from a powerful hurricane, Tropical Storm Priscilla has lost its punch in the eastern Pacific Ocean near the coast of Mexico's Baja California peninsula. But the storm still carries plenty of moisture and is now bearing down on the southwestern U.S., where flood warnings already were posted Thursday.

The NWS has been tracking the surge of moisture from Priscilla as it shifts northward. On Thursday, the NWS Weather Prediction Center warned that Phoenix and Winslow, Arizona, faced a moderate risk of flash flooding, in which there was at least a 40 percent chance of flash flooding.

Hurricane Priscilla struck Mexico with life-threatening surf; footage from a hotel in Puerto Vallarta shows waves pummeling the coastline.

A powerful tropical wind and rainstorm is commencing its onslaught on the U.S. mid-Atlantic coast this weekend, threatening major coastal flooding, widespread power outages, and significant travel disruptions from North Carolina to near New York City.

More flash flooding is expected at many of Utah's outdoor gems on Friday, and additional flooding is likely again on Saturday, as remnants of Hurricane Priscilla continue to churn through the state.

The core of Imelda will miss the U.S. coast thanks to high pressure and Hurricane Humberto, but the new hurricane will still trigger dangerous surf, rip currents, and coastal flooding from Florida to the Northeast.

The downpours also damaged thousands of homes and cut off power to entire towns. More rain was expected this weekend.

Ailing Priscilla will combine with another storm system to create a prolonged rainfall event in some of the driest areas of the US.