Warning message: Warning ZR + 2M is larger than the 1st WRF level

[kwerner]

This warning means that your lowest model level is too low to accommodate the urban canopy model. The ZR value is set in URBPARM.TBL. If your lowest level is lower than 10 + 2m, the code will complain. The solution is to either reduce ZR in the TBL file, or to raise your lowest model level.