* WHAT...For the Dense Fog Advisory, visibility a half mile or less in dense fog. For the Wind Advisory Base of the Blue Mountains, southeast winds 25 to 35 mph with gusts up to 50 mph expected. * WHERE...In Oregon, Foothills of the Northern Blue Mountains of Oregon. In Washington, Foothills of the Blue Mountains of Washington. * WHEN...For the Dense Fog Advisory, until 1 PM PST this afternoon. For the Wind Advisory, from 8 AM to 7 PM PST Friday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Low visibility could make driving conditions hazardous.