National Weather Center Colloquium
Toward understanding of the evolution of the North American Monsoon
Dr. David L. Mitchell
Associate Research Professor
Desert Research Institute, Reno, Nevada
26 February 2013, 4:00 PM
National Weather Center, Room 1313
120 David L. Boren Blvd.
University of Oklahoma
The North American Monsoon (NAM) has a strong impact on summer rainfall patterns and amounts over North America. Although regional climate models have succeeded in reproducing some features of the NAM, its onset, strength and regional extent are not well predicted, and a physical understanding of key processes governing its evolution remain elusive. We propose a partial mechanistic understanding of the NAM incorporating local- and regional-scale processes. The proposed hypotheses are supported with satellite observations and climatologies of sea surface temperature, sea surface height, outgoing longwave radiation, 500-hPa streamline reanalysis in the NAM region, and rainfall amount, considered along with temperature and humidity profiles from soundings over the Gulf of California.