National Weather Center Colloquium

Variability of African Easterly Waves

Dr. Chris Thorncroft
Professor and Chair
Department of Atmospheric & Environmental Sciences
SUNY Albany

22 October 2013, 4:00 PM

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

The first part of the talk will review the current state of knowledge of the observed life cycle of African easterly waves (AEWs) including a consideration of the regional variations in the structure of AEWs as they move across the African continent and into the tropical Atlantic. Numerical weather prediction analyses will be combined with observations from Tropical Rainfall Measuring Mission to show that, while AEWs tend to be characterized by vorticity peaks at mid-levels over land, at the coast there is a tendency for all AEWs to develop low-level circulations. The regional differences in the AEW structure will be related to differences in the nature of the convection and associated heating rate profiles. The second part of the talk will highlight the nature of observed AEW variability and its causes including the roles played by the Madden-Julian Oscillation and convectively coupled Kelvin waves. The consequences of this variability for downstream tropical cyclogenesis will also be considered.

Speaker bio

For accommodations based on disability, or more details, please call 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.

The University of Oklahoma is a smoke-free / tobacco-free campus.

National Weather Center Colloquium Seminar Series website