Tropical Storm Priscilla could bring heavy rain and a “significant” risk of flash flooding to the southwestern United States through this weekend, forecasters warn.

Tropical Storm Jerry could become a hurricane in the Atlantic as Priscilla brings rain, surf, and flooding risks to Baja California in Mexico.

Flash flooding is a growing risk in the southwestern U.S. through this weekend. The reason is a tropical storm headed inland from the Pacific Ocean.

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 was beginning to lose some punch but was still a powerful Category 2 storm off Mexico's Pacific coast, the Miami-based National Hurricane Center says.

Priscilla has lost hurricane strength as it churns off Mexico's western Pacific coast ever closer to the Baja California peninsula. Meanwhile, Tropical Storm Jerry has strengthened in the Atlantic

The National Weather Service is warning that Tropical Storm Priscilla may deliver light rainall and thunderstorms across Southern California in the coming days.

As concerns of potential flash flooding loom from Tropical Storm Priscilla, Tucson residents are flocking to sandbag stations to prepare for the worst.

Priscilla could bring flash flooding through the weekend across the U.S. Southwest, the U.S. National Hurricane Center in Miami said.

Moisture from the remnants of a tropical system is moving through Colorado today, leading to periods of heavy rain across the western third of the state, and shower chances in southern Colorado.