Scheduled Downtime
On Friday 21 April 2023 @ 5pm MT, this website will be down for maintenance and expected to return online the morning of 24 April 2023 at the latest

(SOLVED) Difference in smooth_option settings

This post was from a previous version of the WRF&MPAS-A Support Forum. New replies have been disabled and if you have follow up questions related to this post, then please start a new thread from the forum home page.


New member
Hello everyone.

In order to solve some CFL errors, I had to chew the GEOGRID.TBL smooth_option. Reviewing the user guide and documentation found on the internet, the only thing I can see are the 3 different options, but I can't find any explanation of how each one works, or even know which one softens more and which softens the terrain less. What is the difference between the options? Where can I find more information?

Thank you.
Please find the relevent information on the document here:

The 1-2-1 and smth-desmth options are inherited from MM5. The above document provides details of the smoothing options.