PBLH is 0 for all areas of domain

[William.Hatheway]

I am trying to calculate wind gusts using an equation from a research paper.

In the paper you need to calculate wind speed at the pblh.

However, When I print out the pblh values they are all 0

(wrf-python) workhorse@workhorse-MS-7D91:/media/workhorse/1774-7AEE/Python Charts/python charts development/Development$ python3 SFC_MSLP_WNDGUSTS_SPD_DIR.py /home/workhorse/WRF_Intel/WRFV4.5.2/run/ d02
Plotting data: 2024/02/10 00:00 UTC
PBLH:
Shape: (205, 190)
Headers: Coordinates:
    XLONG    (south_north, west_east) float32 -101.3 -101.3 ... -95.3 -95.27
    XLAT     (south_north, west_east) float32 28.29 28.29 28.29 ... 33.72 33.72
    XTIME    float32 0.0
    Time     datetime64[ns] 2024-02-10
Attributes: {'FieldType': 104, 'MemoryOrder': 'XY ', 'description': 'PBL HEIGHT', 'units': 'm', 'stagger': '', 'coordinates': 'XLONG XLAT XTIME', 'projection': LambertConformal(stand_lon=-99.875, moad_cen_lat=31.25000762939453, truelat1=31.25, truelat2=31.25, pole_lat=90.0, pole_lon=0.0)}
Values: [[0. 0. 0. ... 0. 0. 0.]
 [0. 0. 0. ... 0. 0. 0.]
 [0. 0. 0. ... 0. 0. 0.]
 ...
 [0. 0. 0. ... 0. 0. 0.]
 [0. 0. 0. ... 0. 0. 0.]
 [0. 0. 0. ... 0. 0. 0.]]

my namelist files are attached.

 

[William.Hatheway]

Also I am using the geogrid ARW.NOAH for my geography table

 

[Ming Chen]

PBLH is a diagnostic variable calculated in the QNSE scheme (bl_pbl_physics = 4). It is initialized to be zero everywhere. But once the model starts running, it should be calculated.

Have you checked this variable in other wrfout files, for example the wrfout file at local noon time?

 

[William.Hatheway]

PBLH is a diagnostic variable calculated in the QNSE scheme (bl_pbl_physics = 4). It is initialized to be zero everywhere. But once the model starts running, it should be calculated.

Have you checked this variable in other wrfout files, for example the wrfout file at local noon time?

That's what it is, the initizliation time was the issue.
Now question about PBLH is it a value from the ground level or WRF (taking in consideration of topography) or does it start at 0 meters
So if I want the height of the lowest level of pbl do I need to subtract the z at the ground level?

 

[William.Hatheway]

That's what it is, the initizliation time was the issue.
Now question about PBLH is it a value from the ground level or WRF (taking in consideration of topography) or does it start at 0 meters
So if I want the height of the lowest level of pbl do I need to subtract the z at the ground level?

I'm trying to implement the UPP's method of gust calculation based on pblh.

Gust_Wind Implementation?

I am upgrading older wrf models to wrf 3.7. One goal was to add windgust to the output parameters. It appears clwrf_gust_wind was added in wrf 3.3.1, but the information available on how to accomplish that seems very limited (from forum and google searches). It appears additional parameters...

forum.mmm.ucar.edu

 

[Ming Chen]

PBLH is height above ground level.

 

[William.Hatheway]

PBLH is height above ground level.

Thank you @Ming Chen