* WHAT...North winds 20 to 30 mph with gusts up to 45 mph are expected today, with northeast winds 15 to 25 mph with gusts up to 45 mph expected on Saturday. * WHERE...In Arizona, Northwest Deserts and Northwest Plateau. In California, Cadiz Basin and Eastern Mojave Desert. In Nevada, Las Vegas Valley, Northeast Clark County, Sheep Range, Southern Clark County, and Spring Mountains-Red Rock Canyon. * 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 crosswinds will exist along Interstate 15, Interstate 40, AZ State Route 66, and CA State Route 62. The strongest wind speeds are expected this afternoon and Saturday, with a lull tonight.