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

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

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.

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.

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

The end of the week could feel different, with remnants of Priscilla poised to bring rain, wind and humidity to San Diego County.

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

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