[Wrf-users] Upper boundary cfl error (UNCLASSIFIED)

Dr. Craig A. Mattocks cmattock at email.unc.edu
Fri Mar 5 20:38:30 MST 2010

The generation of noise over steep terrain (slopes greater than 30 degrees) at horizontal resolutions finer than 1 km is a well-known problem of terrain-following sigma-p coordinates.

See Katherine Lundquist's presentation at the WRF Workshop last year:


and an upcoming article in Monthly Weather Review:


The authors have developed an Immersed Boundary Method (IBM) for WRF that overcomes these problems to simulate flow over steep complex terrain, such as urban landscapes.

- Craig

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