Coastal Flood Advisory

* WHAT...Dangerously large breaking waves up to 20 feet, decreasing to 10 to 15 feet tonight. Minor coastal flooding expected.

* WHERE...West facing reefs of the Marianas.

* WHEN...For the High Surf Warning, until 4 PM ChST Thursday. For the Coastal Flood Advisory, until 6 AM ChST Wednesday.

* IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. Breaking waves can sweep people off jetties and docks, and into dangerous seas. Life-threatening swimming conditions and significant beach erosion can be expected.

* ADDITIONAL DETAILS...Typhoon Bavi (09W) and the trailing monsoon surge will continue to produce significant swells towards the Marianas. Dangerous surf heights of up to 20 ft and coastal inundation of 1 to 3 ft can be expected through at least tonight, especially along west-facing shores. A local observer reports 15 to 18 ft at Oka point. Then, surf will gradually diminish as Bavi moves farther away.