Atmospheric Rivers.

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Presentation transcript:

Atmospheric Rivers

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

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

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

Mount Rainier National Park 18 inches in 36 hr (Nov 8, 2006)

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

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.

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