* WHAT...Rough bar conditions expected. North winds 15 to 20 kt with gusts up to 25 kt. * WHERE...In the Main Channel of the Columbia River Bar. * WHEN...From 2 PM to 11 PM PDT Tuesday. * IMPACTS...Conditions will be hazardous to small craft, especially when operating near to, or attempting to cross, the Columbia River Bar. * ADDITIONAL DETAILS...Ebb current of 5.19 kt at 151 AM Monday. Seas 3 to 4 ft. Ebb current of 2.95 kt at 234 PM Monday. Seas 3 ft. Ebb current of 5.56 kt at 252 AM Tuesday. Seas 4 ft. A Small Craft Advisory means that wave conditions are expected to be hazardous to small craft in the vicinity of the Columbia River Bar. Mariners are advised to obtain the latest bar conditions from the United States Coast Guard before attempting to cross the bar.