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Atmospheric Rivers

Atmospheric Rivers. Atmospheric Rivers. Associated with most of the major flooding events over the W. Coasts of N. and S. America. A relatively narrow current of warm, moist air from the subtropics or subtropics. Local Version: The Pineapple Express: November 6-7, 2006. November 6-9,

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Atmospheric Rivers

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  1. Atmospheric Rivers

  2. Atmospheric Rivers Associated with most of the major flooding events over the W. Coasts of N. and S. America A relatively narrow current of warm, moist air from the subtropics or subtropics.

  3. Local Version: The Pineapple Express: November 6-7, 2006

  4. November 6-9, 2006 Dark Green: about 20 inches

  5. Mount Rainier National Park18 inches in 36 hr (Nov 8, 2006)

  6. Can Spot Them in Vertically Integrated Water Vapor-Precipitable Water Content from Satellite (Generally Microwave) Sensors http://tropic.ssec.wisc.edu/real-time/mimic-tpw/natl/main.html

  7. Criterion • AR terminology generally used for moisture plumes with greater than 20 mm (2 cm) of IWV content • Not all AR give heavy precipitation (e.g., ones during summer). • Need strong winds, moisture, and a less stable environment.

  8. Terrain Greatly Enhance Precipitation Associated with Atmospheric Rivers on the West Sides of Continents

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