Cloud height [actual_thb0_cloudheight_m] SOLVED

Discussion of the Meteohub software package

Moderator: Mattk

Post Reply
gm4jjj
Expert Boarder
Expert Boarder
Posts: 108
Joined: Mon Jan 18, 2010 3:53 pm
Location: Dunfermline, Fife UK

Cloud height [actual_thb0_cloudheight_m] SOLVED

Post by gm4jjj »

I am getting a different value for [actual_thb0_cloudheight_m] and the cloud height reported by WDL (in Clientraw.txt).

Example: [actual_thb0_cloudheight_m] = 1838m v WDL = 195m

Which is correct and why are they different?
cgn
Expert Boarder
Expert Boarder
Posts: 91
Joined: Fri Jan 15, 2010 10:54 pm
Location: cgn

Re:Cloud height [actual_thb0_cloudheight_m] and WDL Cloud he

Post by cgn »

The cloudheight will be calculated with this formula (approx.):
(temperature - dewpoint) * 125 = cloudheight (in m).

So calculate with your temperature and dewpoint and decide which value is correct.
Best regards
cgn

-----------------------------------------
Weather Station: Oregon WMR 200
Meteohub-System: SheevaPlug
Since Dec 2009
gm4jjj
Expert Boarder
Expert Boarder
Posts: 108
Joined: Mon Jan 18, 2010 3:53 pm
Location: Dunfermline, Fife UK

Re:Cloud height [actual_thb0_cloudheight_m] and WDL Cloud he

Post by gm4jjj »

Is that in degrees C or F?

Assuming it is C as you have height in m

Worked example-

With Temp -1.0 Dp = -2.9 :

Calculated is approx 237m

The WDL figure in the cleintraw.txt file (calculated by METEOHUB not WD) is 232m

The figure calculated by METEOHUB [actual_thb0_cloudheight_m] is 1700m - something seriously wrong there!
gm4jjj
Expert Boarder
Expert Boarder
Posts: 108
Joined: Mon Jan 18, 2010 3:53 pm
Location: Dunfermline, Fife UK

Re:Cloud height [actual_thb0_cloudheight_m] and WDL Cloud he

Post by gm4jjj »

EDIT I may be using the wrong thing - Doh, I am using inside temp sensor for Meteohub ! Let me find the outside temp sensor and try again!

Yes! - I should have used [actual_th0_cloudheight_m]
Post Reply