* WHAT...Rough bar conditions expected during very strong ebb currents. Seas peaking near 10 ft and west winds 10 to 15 kt during the very strong ebb current Wednesday evening. Seas peaking near 8 ft and south winds 10 to 15 kt during the very strong ebb current Thursday evening. * WHERE...In the Main Channel of the Columbia River Bar. * WHEN...Small Craft Advisory, from 4 PM this afternoon to 9 PM PDT this evening. Small Craft Advisory, from 5 PM to 10 PM PDT Thursday. * IMPACTS...Conditions will be hazardous to small craft, especially when operating near to, or attempting to cross, the Columbia River Bar. * ADDITIONAL DETAILS...Very strong ebb current of 6.88 kt at 644 PM Wednesday. Seas 10 ft. Ebb current of 3.43 kt at 720 AM Thursday. Seas 6 ft. Very strong ebb current of 6.5 kt at 732 PM Thursday. Seas 8 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.