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Sensor is located on a realty office just downwind (prevailing that is) from the main launch. There are no surrounding obstructions of any note but offshore flow (ENE to N) will be rather flukey. "Evanne's Rule" for Purdy Spit: Purdy usually blows if there is a 2 millibar (.06") or greater westerly gradient between Bremerton and at least two to the following: Forks, Hoquiam, Astoria and Portland. Westerly winds blow in from the coast and excellerate as they make their way around the Olympic Mountains. West winds and southwest "clearing winds" are what you want to make the Purdy Spit work.

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