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There is a cold ocean current off the coast of Oregon that tends to stabilize the atmosphere. Tornadoes need strong thunderstorms to form. Such storms form best when there is a layer of warm, moist, unstable air in the lower atmosphere. The cold water makes it difficult for such a pattern to arise. Hurricanes have a similar need, only, much greater. The amount of moisture that a hurricane needs can only be found over very warm ocean water. Any hurricane heading in the direction of Oregon would quickly degenerate over the cold water, making it virtually impossible for the state to get a hurricane.

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Q: Why are tornadoes and hurricanes rare in Oregon?
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