## values of the height of the different vertical levels in WRF

Discuss advection schemes, timestepping, pressure gradients, coordinates, etc.

### values of the height of the different vertical levels in WRF

Hi,
I have been running WRF and I would like to know if anyone knows the mean to obtain the height (or pressure) corresponding to the different vertical levels.
thank you,
Guillaume
guiyaum

Posts: 4
Joined: Tue Jun 16, 2009 9:11 am

### Re: values of the height of the different vertical levels in WRF

Hello Guillaume

I see this post is a little dated but I'm going to share the solution for others who my be interested:

Atmospheric models solve the equations of motion in constant pressure coordinates so we'll be working with that.

If your doing this as a case study the hypsometric equation is going to give more accurate results, assuming to have a way to get Tmean, SP and rho for that day.

If your looking to forecast for..say..tomorrows 100m meter wind speed then using a spreadsheet to generalize the levels should work. Try this:

dP = rho * g dZ

ex:

dP = 1.225 * 9.81 * 100m

dP ~ 1.202 kPa

So your level would be .9778

You will need to change you surface P accordingly. Tuning your Params for such fine vertical resolutions is going to be more than half the battle.

Hope this helps.

BG
b.glynn

Posts: 1
Joined: Mon Jun 28, 2010 10:18 am

### Re: values of the height of the different vertical levels in WRF

In WRF:
Pressure = P + PB
Geopotential height = (PH +PHB)/9.8
The views expressed in this message do not necessarily reflect those of NOAA or the National Weather Service or the University of Oklahoma.
James Correia, Jr
jimmyc

Posts: 519
Joined: Tue Apr 15, 2008 1:10 am

### Re: values of the height of the different vertical levels in

Is the model height is measuring from above ground or above sea level?
Jipson Johnson

Posts: 24
Joined: Thu Jan 08, 2015 2:15 pm