* WHAT...Large waves and dangerous surf conditions. Breakers up to 30 feet.

* WHERE...North and Central Coast of Oregon, and South Washington Coast.

* WHEN...From 5 AM to 10 PM PST Monday.

* IMPACTS...Destructive waves may wash over beaches, jetties, and other structures unexpectedly. People can be swept off rocks and jetties and drown while observing high surf. Similar wave conditions in the past have resulted in beach erosion and damage to coastal properties and buildings. High water run-up is expected on beaches and low- lying shoreline.

* ADDITIONAL DETAILS...There is a high threat for sneaker waves.