A powerful storm moved into Southern California on Sunday, bringing unusually strong winds of up to 70 mph to Los Angeles and Ventura counties.Officials warned that the storm is forecast to bring heavy rain and a risk of flash floods, especially in recently burned areas that could see mud flow down hillsides.

Strong winds were expected to cause flight problems at Los Angeles International Airport, and forecasters said there was enough instability aloft that there could be a 36% chance of thunderstorms in parts of the L.A. area. Waterspouts and even weak tornadoes are possible.