Norbert, which roared over Baja, Calif., and onto the mainland Saturday, was expected to rapidly weaken into a tropical depression by late Sunday morning, with winds that were once measured at 105 mph decreasing to 60 mph, forecasters from the U.S. National Hurricane Center in Miami predicted.

At 2 a.m., the storm was centered 140 miles southwest of Chihuahua, Mexico, and expected to move into western Texas and New Mexico later Sunday. Four to 6 inches of rain, triggering possible mudslides and flooding, were predicted for northwestern Mexico.

Southern Mexico, meanwhile, was also under the gun from the approach of Tropical Storm Odile. At 2 a.m. Sunday, Odile was centered 60 miles southwest of Manzanillo, moving toward the west at 7 mph. Forecasters said it appeared likely Odile's track could keep it from making landfall but only a small deviation could bring it onshore.