Hurricane Hilary churned off Mexico's Pacific coast Friday 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 warned the storm could cause extreme flooding, mudslides and even tornadoes across the region. MORE: https://www.cbs8.com/article/weather/hurricane-hilary-impact-on-san-diego-weather-alerts-storm-preparedness/509-f1cd78cb-5ffe-46e7-9c9c-64ac84f3164a