Accessories Menu

[mhabimana]

Climsoft v3.2 accessories menu has two sub menus (calculation of Dew Point and RH and Generate XML output). Calculation of Dew Point and RH feature is very used by observers at the Met stations to compute in few seconds the Dew Point and RH given the Dry and Wet Bulb temperatures. Any contributor can try to contribute to this feature in the new climsoft version 4 under development.

[Steve-Palmer]

Need to be careful to use the right formula. The full calculation is very complex. There are a variety of simplified versions, but need to be careful to use the right one, because the formula is pressure dependent, so a calculation which works at Standard Pressure does not necessarily give the right answer at lower pressures typical of high-level stations or sondes. I will check.

[mhabimana]

@Steve-Palmer -Thanks Steve,I remember Jean Claude, from Cote d'Ivoire contributor) raised an issue some times back because this calculation using the climsoft program (V3.2) was giving values of Dew point and RH which are totally different from the program he is using in this Country to calculate the same and he was wondering why this and which one is right or wrong? (the one in climsoft or his).

[isedwards]

I also received a message from @claudedeki a few weeks ago relating to this:

I have a difficulty with version 4 of Climsoft for calculating dew point and humidity. The values calculated by climsoft are very different from our calculators We don't currently have details of the software/formula he is using.

[mhabimana]

@isedwards - I think he is mentioning in V3.x because this feature has not yet been implemented in V4.

[claudedeki]

Hello Ian, I would like to apologize for the delay in responding to your mail. I was on a mission. Our computers give: for T ° = 31.8 and T ° w = 27.8 the following values Td = 26.4 Humidity = 73 Vapor pressure = 34.2 Climsoft gives: for the same values of T and Tw the values Td = 22.0 and Humidity = 94 Upon returning from the mission, I will send you the script that we use for the calculation of our parameters.

[mhabimana]

@claudedeki - Thanks very much for your contribution.I am happy to see that you managed to login to GitHub and immediately you joined the discussion. However,I just test the values you mentioned above with climsoft and below see the result (note that the values of T at Tw are entered without comma into climsoft otherwise they give you wrong results.See below: 1) 2) Note:1) is the right way of using this conversion while 2) is the wrong way of using the conversion feature in climsoft.

I can see your result is closer to 1) in climsoft. @claudedeki : Can I suggest you to work on this feature in climsoft version 4 since your conversion formula has an extra component of Vapor pressure and since the result are almost similar? We can discuss further if you want to work on this feature.

[claudedeki]

Hello Marcellin I will be very happy to work on this features for climsoft version 4. My job take me time but i will do my best.

[mhabimana]

@claudedeki - Thanks well noted

[mhabimana]

@claudedeki - How are you progressing with the above?.Let us know if you need any help.

[isedwards]

@mhabimana Is this issue definitely resolved? I thought we were waiting for @Steve-Palmer to confirm the correct formula to use:

Need to be careful to use the right formula ... I will check.