Hurricane Hilary is churning off Mexico’s Pacific coast as a powerful Category 4 storm threatening to unleash torrential rains on the mudslide-prone border city of Tijuana before heading into Southern California as the first tropical storm there in 84 years. Forecasters warn the storm could cause extreme flooding, mudslides and even tornadoes. No tropical storm has made landfall in Southern California since Sept. 25, 1939. The U.S. National Hurricane Center says Hilary strengthened rapidly early Friday then lost some steam, with sustained winds falling from 145 mph to 130 mph Friday nigh...