Hi
As i'm based in Saigon, the heat index is pretty extreme. The standard display in cumulus (from the Davis Vantage Pro 2 plus) is the Heat Index, however, the THSW is far more valuable to us.
Can you tell me how to get cumulus to display and record this data?
Thanks
Mark
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Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
Cumulus MX V4 beta test release 4.0.0 (build 4019) - 03 April 2024
Legacy Cumulus 1 release 1.9.4 (build 1099) - 28 November 2014
(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
Displaying THSW data in cumulus
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- Posts: 9
- Joined: Fri 17 Oct 2014 3:49 pm
- Weather Station: Davis Vantage Pro 2 plus
- Operating System: Windows 7
- Location: Ho Chi Minh City
- steve
- Cumulus Author
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Re: Displaying THSW data in cumulus
Cumulus only makes the value available as a web tag, so it can be displayed on a web page. The web tag is <#THSWindex> - see the wiki for a full list of web tags - http://wiki.sandaysoft.com/a/Webtags
I seem to recall that there is a problem with the Davis code which supplies one or both of the THW and THSW values, so you may find that it doesn't actually work anyway.
I seem to recall that there is a problem with the Davis code which supplies one or both of the THW and THSW values, so you may find that it doesn't actually work anyway.
Steve
Re: Displaying THSW data in cumulus
Just the THSW refuses to function correctly, see here.steve wrote: I seem to recall that there is a problem with the Davis code which supplies one or both of the THW and THSW values, so you may find that it doesn't actually work anyway.
- GraemeT
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Re: Displaying THSW data in cumulus
Mark,
I think there's enough information here: http://www.bom.gov.au/info/thermal_stress/index.shtml to be able to calculate a THSW index in PHP or Javascript. It's quite similar to the method used to calculate "apparent temp".
edit:
This PHP function might work (I haven't tested it as I can't measure solar radiation)
I think there's enough information here: http://www.bom.gov.au/info/thermal_stress/index.shtml to be able to calculate a THSW index in PHP or Javascript. It's quite similar to the method used to calculate "apparent temp".
edit:
This PHP function might work (I haven't tested it as I can't measure solar radiation)
Code: Select all
function thsw_index($temp,$hum,$wspeed,$SolarRad) {
$e=$hum/100*6.105*exp(17.27*$temp/(237.7+$temp));
$ws=($wspeed*1000)/3600;
$thsw_index=round(($temp+0.348*$e-0.70*$ws+0.70*$SolaRad/($ws*10)-4.25),1);
return $thsw_index;
} // end of thsw()
Cheers,
Graeme.
Graeme.