[Wrf-users] Experiences with high-resolution WRF-ARW

[Kemp, Eric M.]

Dear wrf-users:

My group is running WRF-ARW at high resolution (dx = 1 km) to simulate turbulence.  
Recently we tried running at very high vertical resolution (dz ~= 12.5 m in the lowest
500 m of the domain), and encountered CFL errors with time steps as
low as 1/8 of a second.  These runs used the 6th order diffusion
option from Knievel et al (2007), along with real terrain (area around
Albuquerque, NM) and physics (MYJ TKE, Noah land surface,
RRTM/Dudhia radiation, and WSM5 microphysics).

Has anyone here run WRF at such fine resolution, and if so, what were 
your experiences with the time step?  The ARW documentation recommends 
6 seconds for each kilometer of dx, ignoring the effect of vertical resolution.  
Are there other settings that should be tuned?

-Eric

Eric M. Kemp
Meteorologist
Northrop Grumman Information Technology
Intelligence Group (TASC)
4801 Stonecroft Boulevard
Chantilly, VA 20151
(703) 633-8300 x7078 (lab)
(703) 633-8300 x8278 (office)
(703) 449-3400       (fax)
eric.kemp at ngc.com

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