Coastally trapped disturbances along the U.S. west coast: synoptic and mesoscale analysis of 9-12 June 1994
Oosterling, Paul S.
Nuss, Wendell A.
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Synoptic and mesoscale analyses were made for a coastally trapped disturbance along the central California coast that occurred on 9 - 12 June 1994. Hourly sea-level pressure analyses were constructed using a Multi-Quadric interpolation technique to blend observations with synthetic observations from the National Meteorological Center mesoscale model in data-void regions over the ocean. In addition to describing the disturbance's evolution in terms of sea-level pressure changes, the 850 mb temperature change and thermal advection were analyzed to determine their influence on the initiation and propagation of the coastally trapped disturbance. Low-level thermal advection was shown to be a key mechanism in initiating the event, in the development of an off-shore low pressure center, and subsequently in changing the nature of the forcing of the disturbance from ageostrophic down-gradient flow to more nearly a response to the existing geostrophic pressure gradient.
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