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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
The mixing ratios of QRAIN and QSNOW definitley exists IN the clouds, but now I wonder if they also exist outside the clouds on different levels? How are these variables integrated in time? I mean, are they integrated in time so that they fall down to a different level further down or are they immediately taken from the cloud to the ground from one timestep to another?

I am using the THOMPSON scheme and the Xu and Randall cloudfraction scheme.


QRAIN and QSNOW may fall to different levels and experience growth due to accretion, or can decrease/disappear due to evaporation. They do not fall directly to the ground in one time step.