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

4 posts
• Page **1** of **1**

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

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

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

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

In WRF:

Pressure = P + PB

Geopotential height = (PH +PHB)/9.8

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

James Correia, Jr

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

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

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