* WHAT...Rough bar conditions expected. Seas 8 to 10 ft at 10 seconds and west winds 10 to 20 kt with gusts up to 25 kt. * WHERE...In the Main Channel of the Columbia River Bar. * WHEN...Until 11 AM PDT this morning. * IMPACTS...Conditions will be hazardous to small craft, especially when operating near to, or attempting to cross, the Columbia River Bar. * ADDITIONAL DETAILS...First Ebb current of 3.8 kt at 632 AM Wednesday. Seas 7 ft. Second Very strong ebb current of 6.88 kt at 644 PM Wednesday. Seas 10 ft. Third Ebb current of 3.43 kt at 720 AM Thursday. Seas 6 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.