The objectives of this project are to document the mesoscale structure of coastally-trapped phenomena along the U.S. West Coast, establish the relationship between the synoptic-scale structure and the onset of coastally-trapped disturbances, determine the sensitivity of coastally-trapped phenomena to synoptic-scale variability, and to establish forecast criteria for predicting coastally-trapped disturbances. This work is supported entirely by the Office of Naval Research Marine Meteorology program through the Coastal Meteorology Accelerated Research Initiative.