Rapid Refresh (RAP) and High-Resolution Rapid Refresh (HRRR) Forum
Re: Questions Regarding Hybrid Level
Posted By: John M. Brown In Response To: Questions Regarding Hybrid Level (David Daniel)
Date: 18-January-13 0228Z
In Response To: Questions Regarding Hybrid Level (David Daniel)
The RAP uses as the forecast model a configuration of the Weather Research and Forecast (WRF) model. The vertical coordinate in this model is the sigma coordinate, not the hybrid sigma - pressure coordinate that is described in the second link in your post. The sigma coordinate is similar to the hybrid sigma - pressure coordinate, except that it does not become purely pressure until the top of the model (in the case of the RAP, this is 10 hPa,
If you are specifically interested in the Planetary Boundary Layer (PBL), there is a variable for the height (or depth) of the PBL, which is quite variable in space and time. The name of this variable is HPBL (in meters), given in the first link in your post. It is down toward the bottom of the list in this link.
If this information is insufficient to put you on the right track toward the answer to your questions, I suggest you send me an email directly.
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