THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A COASTALFLOOD ADVISORY, WHICH IS IN EFFECT FROM 7 AM TO 10 AM PST TUESDAY.

* COASTAL FLOODING...MINOR TIDAL OVERFLOW IS LIKELY ALONG THE IMMEDIATE COASTLINE OF THE NORTH INTERIOR.

* SOME AFFECTED LOCATIONS...PORT TOWNSEND, FRIDAY HARBOR, BELLINGHAM, LA CONNER.

* TIMING...THE HIGH TIDES AROUND 8-9 AM TUESDAY WILL COINCIDE WITH LOW ATMOSPHERIC PRESSURE OF AROUND 1000 MB. THE COMBINATION OF HIGH TIDE AND LOW PRESSURE WILL BRING THE SEA LEVEL SLIGHTLY ABOVE THE HIGH ASTRONOMICAL TIDE LEVEL AND CAUSE MINOR TIDAL OVERFLOW IN LOW LYING AREAS ADJACENT TO THE SEA.

* TIDE INFO...TIDE TABLE HIGH TIDES ARE FORECAST TO BE AROUND A FOOT BELOW HIGH ASTRONOMICAL TIDE, BUT THE LOW PRESSURE WILL CAUSE A POSITIVE ANOMALY OF JUST OVER A FOOT.

* IMPACTS...LOW-LYING AREAS IMMEDIATELY ADJACENT TO THE SEA WILL PROBABLY GET A FEW INCHES OF WATER OM THEM FOR A FEW HOURS TUESDAY MORNING.