* WHAT...South winds 20 to 30 mph with gusts up to 55 mph expected. * WHERE...Portions of southwest Arizona and southeast and southern California. * WHEN...From 2 AM MST /2 AM PDT/ to 5 PM MST /5 PM PDT/ Sunday. * IMPACTS...Difficult driving conditions, especially for larger vehicles traveling along roads with crosswinds. Light, unsecured objects may become airborne.