UW ATMS 212 - Study Notes (63 pages)

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Study Notes



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Study Notes

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Lecture Notes


Pages:
63
School:
University of Washington
Course:
Atms 212 - Air Pollution From Urban Smog to the Ozone Hole
Air Pollution From Urban Smog to the Ozone Hole Documents

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Major Extratropical Cyclones of the Northwest United States Part I Historical Review Climatology and Synoptic Environment Clifford Mass and Bridget Dotson 1 Department of Atmospheric Sciences University of Washington Seattle Washington 98115 Submitted to Monthly Weather Review November 2008 Corresponding author Professor Clifford F Mass Department of Atmospheric Sciences Box 351640 University of Washington Seattle WA 98195 cliff atmos washington edu 206 685 0910 1 1 Abstract 2 Introduction Although the cool waters of the eastern Pacific prevent tropical cyclones from reaching the Northwest U S this region often experiences powerful midlatitude cyclones capable of producing hurricane force winds In fact some Northwest cyclones have winds comparable to category two or three hurricanes are generally larger than tropical storms and have effects amplified by tall trees thus making such storms a major threat to life and property Even though Northwest extratropical cyclones have frequently resulted in widespread damage and injury national media attention has been far less than for their tropical cousins Only a handful have been described in the literature Lynot and Cramer 1966 Reed 1980 Reed and Albright 1986 Kuo and Reed 1988 Steenburgh and Mass 1996 and there are many questions regarding their mesoscale and dynamic evolutions including interactions with terrain Reviewing the NOAA publication Storm Data and newspaper accounts suggests a conservative estimate of damage and loss due to cyclone based windstorms over Oregon and Washington since 1950 of 10 to 20 billion 2008 dollars Perhaps the richest resource describing the large cyclones that strike the region is the extensive series of web pages produced by Wolf Read1 Over fifty storms are described in great depth in that work as well as articles reviewing the basic characteristics of the intense low pressure systems that bring great damage to the region The Pacific Northwest is particularly vulnerable to strong cyclone



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