Tropical Storm Priscilla formed Saturday off the west coast of Mexico, where it was forecast to bring dangerous surf and possible flooding, the National Hurricane Center said.

Priscilla strengthened Sunday morning as it moved over Pacific waters on a path expected to run parallel to the land, with tropical storm watches in effect for a vast stretch of the Mexican coastline from the southwestern state of Jalisco up to the Baja California peninsula.

Forecasters issue a tropical storm watch for a particular area when tropical storm conditions are possible in that area, typically within 48 hours of the watch being issued, according to the hurricane center.

On its forecast track, Priscilla's center was expected to remain offshore of the southwestern Mexican coast and travel parallel to the

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