Thanks for the comments, time to go and learn about Met and Python :-) Barry
On Monday, May 16, 2022 at 11:40:11 a.m. UTC-4 [email protected] wrote: > Calculations are here: > https://github.com/weewx/weewx/blob/6c90a174f9cf81b1b93b83b70a426199a51b47ba/bin/weewx/wxformulas.py > > see the comment: > The 'new' algorithm uses: > https://www.wpc.ncep.noaa.gov/html/heatindex_equation.shtml > > > > > > On Mon, May 16, 2022 at 8:18 AM Greg Troxel <[email protected]> wrote: > >> >> Barry <[email protected]> writes: >> >> > Now that I have (with help from the group) Weefx and the tempest >> running >> > well I would lie to throw out a Met. >> > >> > Current observation >> > >> > Wind 210/3knts >> > Humidity 75% >> > Temp 20.1C >> > Dewpoint 15.5C >> > >> > Wind Chill 20.1C >> > Heat Index 20.1C >> > Feels Like 21.5C >> > >> > From what I have read Heat index is calculated from Temperature and >> > Humidity and Feels Like is calculated from Temperature, Humidity and >> Wind. >> > with any wind, would it not decrease the Feel Like below the value >> of >> > the Heat Index? I am not sure how the Feel Like can be higher than the >> Heat >> > Index. Are Wind Chill, Heat Index and Feels like calculated by the >> Tempest, >> > weewx or a combination of both? >> >> There are a number of terms, and it woudl not shock me if some equipment >> used a term with a non-standard definition. The first thing you should >> do is chase down what the words actually mean. Often heat index type >> values are relative to 50% humidity. There's no reason to expect that >> Heat Index and Feels Like have the same baseline treatment of humidity, >> unless you read both definitions. >> >> I have never seen a definition for "Feels Like". It seems to be an >> acurite concept, basically heat index or wind chill, depending on >> whether it is hot or cold, in some vague way. I would not be surprised >> if there were a number of inconsistent definitions. I generally ignore >> things like this, that aren't clearly traceable to a widely-agreed-on >> definition backed up by the literature. >> >> Weewx can use values from hardware or calculate. Read your weewx.conf >> and look at the StdWXCalculate section, and read the docs about that. >> >> https://en.wikipedia.org/wiki/Heat_index >> >> There is also THSW, which I gather is popular in .au, but I am unclear >> on it. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "weewx-user" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/weewx-user/rmio7zxzetg.fsf%40s1.lexort.com >> . >> > > > -- > Peter Quinn > (415)794-2264 <(415)%20794-2264> > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/58566d08-66ad-491c-b1b0-8b54c15faa9bn%40googlegroups.com.
