* WHAT...South winds 20 to 30 mph with gusts between 45 and 55 mph expected. * WHERE...Portions of northwest Arizona, southeast California, and southern Nevada. * WHEN...From 2 AM PDT /2 AM MST/ Sunday to 5 AM PDT /5 AM MST/ Monday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.