Re: Mathematical Expressions for Wind Chill Script
Re: Mathematical Expressions for Wind Chill Script
- Subject: Re: Mathematical Expressions for Wind Chill Script
- From: David Lloyd <email@hidden>
- Date: Fri, 01 Mar 2002 17:43:40 +1100
Hello Rob,
>
I'd like to make a simple script which calculates wind chill, but I'm
>
not strong in math terminology and such. For instance, the (V 0.16)
>
in following formula is greek to me, and is not expressed correctly
>
in this message.
>
>
Wind Chill F = 35.74 + 0.6215T - 35.75(V 0.16) + 0.4275T(V 0.16)
>
V = Wind Speed (MPH) T = Temperature (degrees F)
>
To see what I mean, look at:
>
<http://www.srh.noaa.gov/ftproot/ssd/images/windchill_new.gif>
>
Is it even possible to use AppleScript to perform this calculation?
>
If so, I'd appreciate an example of the proper mathematical syntax
>
for the (V 0.16) part.
It appears that V= velocity, and V 0.16 represents the wind velocity
(or speed) to the power of 0.16.
So if for example the wind speed (V) = 50 mph,
and the temperature (T) = -10 degrees then:
Wind Chill F = 35.74 + 0.6215 * -10 - 35.75(50 ^ 0.16)
+ 0.4275* -10 (50 ^ 0.16)
(the ' ^ ' character here is shift-6)
-----
so then as a script routine:
where V = Wind Speed (MPH) and T = Temperature (degrees F)
on getWindChillFactor(V, T)
35.74 + (0.6215 * T) - 35.75 * (V ^ 0.16) + 0.4275 * T * (V ^ 0.16)
end getWindChillFactor
which = -45.32064601873.
----
And this does indeed corresspond with the table Rob pointed us at:
http://www.srh.noaa.gov/ftproot/ssd/images/windchill_new.gif
-----
Did you have a good holiday in Canada Rob? :)
Best regards,
David Lloyd
---------------------------------
email: email@hidden
web:
http://www.kanzu.com
---------------------------------
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