The above is my latest design but as usual I always try and introduce some new tags or process to make it difficult for myself - in this case I added dew point and ‘feels like’ temperature to my weather data watch. I managed dew point but ‘feels like’ is still a problem. I could of course just swipe to the Samsung weather page but that would be too easy. I’ve searched the community and can’t find anyone who can give me any hint on how to do this. This is not to say that I didn’t try…I have the following formula;
G = 13.12 + 0.6215 x Temperatureair in Celsius − (11.37 x (wind_speedm s-1 x 3.6)0.16 + 0.3965 x Temperatureair in Celsius x (wind_speedm s-1 x 3,6) x 2.30.16
The formula requires only temperature and wind speed both of which are available tags in Facer. My understanding of operators lets me down as I get different answers each time I try - could someone here help me and put the formula into something that Facer understands? I’ve put ( and ) in various positions with no success.
I don’t like to ask but I’m stumped!
Yes. It is difficult for me if a formula does not have loads of () . We need to know the natural precedence of the operators . We know a couple of the Cavalry that will fix it . See if they turn up or we Invoke them . I always think it a little rude . I will have a little go . What app are you using to check the Dew Point .
OpenWeather
OK cool . I have had a quick look and they seem to include Humidity .
Nice design… And Ethos. Break the boundaries and ask if needed. Gonna have to get back to some of that.
Now I can read the rest of the comments.
Edit: Challenge accepted. Going to look up the calculation fresh and run up a mock. Sounds like a fun evening.
Edit: Anything will be somewhat inacurate as humidity will not be taken as consideration. Only wind chill
Edit: Ok. Here’s the clincher. How do you do 2^2 to get 4? you can use exp(2) to get E to the 2 but where is X to the power of Y in the expressions? This has been vexing me for years
I have one thing to add . I would like to see the wind blowing towards the Thermometer . But that of course would only please someone who knew about the Latent Heat of Evaporation . 
Well I can’t even do the calculation based on my research as it involved T^0.16 and W^0.16 in the calculation and the expressions lack basic x^y only E^y and E^y-1
Yeah . I can not find anything simple . It will have to be faked a bit . It will never be science . If there was some tables somewhere may be a Simple ratio might be extracted to give an Approximate .
There are tables but the extrapolation relies on exponents. I don’t understand why simple exponents are not part of the expressions outside of exponenting a constant. There is xEy but that is x time 10 to the y
@BIELITZ do you have the source for your original formula?
Also. This became much more fun but may be more than an evening and a deep maths delve into some basic lacks of the expressions and can we, as a team work around them?
The National Weather Service’s formula to calculate wind chill is: 35.74 + 0.6215T – 35.75(V^0.16) + 0.4275T(V^0.16).
That’s Fahrenheit for some really obscure reason but end result is easily converted.
I have to admit to being defeated on this one without basic exponent ability within the expressions of x^y.
Maybe @Facer_Official knows something I don’t as to why there is no ability to square, cube or do basic exponentials in the expressions. Maybe there is and it is just not documented?
@BIELITZ do you have the source for your original formula?
JAG/TI-2000
https://www.cumuluswiki. org/ a/ Feels_Like
(Delete spaces)
Wind blowing towards the thermometer is an easy fix it’s just the rest… 
That one still uses to the power of 0.16 and there is no power of in the facer expressions.
Sorry for the delay. 22 police 7 indoors, 2 with riot gear. Paramedics cleared the combatants as OK but both fight drunk in the house downstairs from my room. I tried to offer bottled water but…
I think that a police siege to quell riot a floor below me is a perfectly acceptable reason for a delay!
It’s starting to look like i will have to use fudgematics to get an approximation of an approximation of ‘feels like’. 
Maybe you can try to use the Australian model for “Apparent temperature”, which also integrates humidity, but uses only operations that we have available in Facers tools set.
It produces slightly different results at some extremes like complete calm but, maybe it is worth a try. It also should work with different temperature array than the Wind chill, which is meant to work best with temperatures close to and below freezing point. You can compare results of the “Wind chill index” by inserting same test values into both calculators.
Hi all
For one, it only makes sense to talk about a chill factor when you have 10°C or less. So that may be a condition you want to consider.
There is an easier formula which is good enough. It is based on a few assumptions, such as being at sea level and humidity is not factored in either.
Formula for Celsius and speed as Kmh:
wind chill = 13.12 + (0.6215 * T) – (11.37 * v * 0.16) + (0.3965 * T * v * 0.16)
Facer Wind speed is in m/s, multiplying that with 3.6 gives you kmh.
I looked at this first but couldn’t find a humidity weather tag in Facer either.
Unfortunately I also looked at this one and they forgot to superscript:
-
W = 13.12 + 0.6215 * T – 11.37 * v 0.16 + 0.3965 * T * v0.16
v0.16 should have the 0.16 as superscript and read as v^0.16 not v*0.16
Ah! OK, thanks. Probably the “back tick” missing on that page when quoting formulas…
#WCHN# Current Humidity Number