Powerful wind gusts knocked down power lines and blew several transformers Monday, causing outages to nearly 10,000 homes and businesses in the Los Angeles area. The National Weather Service said Santa Ana wind gusted as high as 94 mph (151 kph) in the mountains north of the city. The wind combined with low humidity prompted forecasters to issue a «red flag» warning, indicating conditions conducive to brush fires through Tuesday evening. A Department of Water and Power spokeswoman said about 9,900 utility customers were without power.