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 -- 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/CAA1SM23fkeB%3DBpuSFs2o%3DSQWM2DcRwWpc1ekEoDw%2BeNDdp_LHw%40mail.gmail.com.
