Priscilla is now a post-tropical cyclone, but it continues to pose a "significant threat" to bring flash flooding to the southwestern U.S. through the weekend, forecasters say.

Priscilla went from a hurricane to a tropical storm off Mexico's Pacific coast on Wednesday, the Miami-based National Hurricane Center said. The now-post-tropical remnant low is expected to dissipate by Saturday.

As of Friday afternoon, Priscilla's core was some 220 miles west-northwest of Cabo San Lázaro in Baja California Sur, Mexico, with maximum sustained winds of 35 mph, the hurricane center said. It was moving north at 6 mph. 

Tropical Storm Priscilla's track and forecast

On the forecast track, Priscilla's core would stay off the Baja California Sur coast until it dissipates, the hurricane center said.

"As Priscilla moves off the west coast of Baja California, up to an inch of rain is expected across the Baja California peninsula," the hurricane center said in its last advisory for the storm. 

For the southwestern U.S., 2 to 4 inches of rain, with as much as 6 inches in some places "are expected across portions of central and northern Arizona, southern Utah, and southwest Colorado through Saturday," the hurricane center said.