Cloudbase value?

[ConligWX]

Hi there,

Apart from the FTP WDL Service, is Meteobridge going to support a Cloudbase value itself?

[admin]

no and not planned.

[ConligWX]

Boris, I noticed in FTP WDL file clientraw.txt, Field 73 is Cloud Height which does have a value that has been somehow calculated. Could it not be added to Metebridge as a Sensor Template Value?

[admin]

It can be computed with template variables as follows (returns height in feet):

Code: Select all

#if#[th0temp-act.1:0.0]>[th0dew-act.1:0.0]#then#{*([th0temp-act.1:0.0]-[th0dew-act.1:0.0])*400*0}#else#0#fi#

[ConligWX]

Thanks!

[ConligWX]

It can be computed with template variables as follows (returns height in feet):

Code: Select all

#if#[th0temp-act.1:0.0]>[th0dew-act.1:0.0]#then#{*([th0temp-act.1:0.0]-[th0dew-act.1:0.0])*400*0}#else#0#fi#

Boris, can you confirm this equation.

I found this on a wikipedia site: https://en.wikipedia.org/wiki/Cloud_base

• Find the difference between the surface temperature and the dew point. This value is known as the "spread".
• Divide the spread by 4.4 (if temperatures are in °F) or 2.5 (if temperatures are in °C), then multiply by 1000. This will give you cloud base in feet above ground level.
• Add the results from step (2) to the field elevation to get cloud base above sea level.

*400*0 ?


(Temp. – Dew Point) ÷ 2.5 X 1,000 for °C values
(Temp. – Dew Point) ÷ 4.4 X 1,000 for °F values