* WHAT...Southwest winds 20 to 30 mph with gusts up to 50 mph. Ridgetop winds will gust over 80 mph at times. Wave heights of 2 to 4 feet on Lake Tahoe. * WHERE...Greater Lake Tahoe Area. * WHEN...From 11 AM this morning to 2 AM PDT Sunday. * IMPACTS...Gusty winds and rough waters will create hazardous boating conditions on area lakes, including Lake Tahoe. Winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.