National Weather Center Colloquium

Upscale Effects of Deep Convection during the North American Monsoon

Dr. David Stensrud
Research Scientists
National Severe Storms Laboratory

03 September 2013, 4:00 PM

National Weather Center, Room 1313
120 David L. Boren Blvd.
University of Oklahoma
Norman, OK

Reception @ 3:30 PM

The ability of deep monsoon convection to influence the larger-scale circulation over North America is investigated for a 6-day long case study during the 2006 North American monsoon season. Results from Rossby wave ray tracing and numerical simulations using the Advanced Research Weather Research and Forecasting model indicate that North American monsoon convection provides a source region for stationary Rossby waves. Two wave trains are seen in the numerical model simulations, with behaviors that agree well with expectations from theory and ray tracing. The shorter and faster moving wave train moves eastward from the source region in Mexico and reaches the western Atlantic within 4 days. The longer and slower moving wave train travels northeastward and reaches the coastal New England region within 6 days, influencing convective activity along the east coast. An upstream tail of anticyclonic vorticity extends westward from the source region into the central Pacific Ocean. Implications of these results for operational forecasting and regional climate will be discussed.

Speaker bio

For accommodations based on disability, or more details, please contact the School of Meteorology at 325-6561. All visitors without NOAA or University of Oklahoma identification must register at the registration desk on arrival. Visitor parking is available for all University visitors. However, faculty/staff/students must have a current multi-purpose parking permit. Additional parking is available at the Lloyd Noble Center (LNC) for those individuals who do not have a parking permit. You do not need a permit to park in one of 1,200 spaces reserved for CART bus riders, although you must ride the CART shuttle to park in the reserved area. This area is on the north central side of the Lloyd Noble Center. Elsewhere at the LNC, permits are required.

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National Weather Center Colloquium Seminar Series website