238 WWUS76 KSTO 181133 NPWSTO URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE SACRAMENTO CA 330 AM PST SAT JAN 18 2003 CAZ015>019-182000- CARQUINEZ STRAIT AND DELTA-NORTHERN SAN JOAQUIN VALLEY- SOUTHERN SACRAMENTO VALLEY-CENTRAL SACRAMENTO VALLEY- NORTHERN SACRAMENTO VALLEY- 330 AM PST SAT JAN 18 2003 ...A DENSE FOG ADVISORY REMAINS IN EFFECT FOR THE SACRAMENTO VALLEY...THE NORTHERN SAN JOAQUIN VALLEY AND THE DELTA REGION THROUGH MID-DAY TODAY... WIDESPREAD DENSE FOG IS EXPECTED TO REMAIN ACROSS THE SACRAMENTO VALLEY...THE NORTHERN SAN JOAQUIN VALLEY AND THE DELTA REGION THROUGH MID-DAY TODAY. VISIBILITIES IN SOME LOCATIONS WILL BE 1/4 OF A MILE AND LESS. MOTORISTS ARE URGED TO SLOW DOWN AND USE LOW BEAM HEADLIGHTS. TRAVELERS SHOULD ALLOW PLENTY OF TIME TO REACH YOUR DESTINATION THIS MORNING. VISIBILITIES SHOULD BEGIN IMPROVING BY THIS AFTERNOON. $$ LAM