* WHAT...North winds 20 to 30 mph with gusts up to 50 mph expected today, with gusts up to 55 mph expected on Saturday. * WHERE...Lake Mead National Recreation Area, Lake Havasu and Fort Mohave, and San Bernardino County-Upper Colorado River Valley. * WHEN...Until 10 PM PST /11 PM MST/ Saturday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Instances of blowing dust near dry lakebeds may result in reduced visibility. * ADDITIONAL DETAILS...Dangerous boating conditions expected on Lake Mead, Lake Mohave, and Lake Havasu, with wave heights between 2 and 4 feet. The strongest wind speeds will occur Saturday, with slightly slower speeds today and tonight.