RE: Windchill Calculation

[Max H. <ma...@fl...>]

Does that give the temperature including the windchill, or the extra drop in
temperature due to the windchill?

I've implemented it for PHPWeather 2, let me know what exactly it returns,
and I'll commit it.

Max

--
A man on a mission is far different from a drone on a deadline.
 * Rheta Grimsley Johnson

> -----Original Message-----
> From: php...@li...
> [mailto:php...@li...]On Behalf Of David
> Kjellquist
> Sent: 24 March 2002 15:17
> To: php...@li...
> Subject: Windchill Calculation
>
>
> Just a note of praise for the PHP Weather....great
> program. Thanks to the entire team for a very useful
> program.
>
> Below is a modification I made to the .inc program to
> calulate windchill in both F and C. I placed this code
> right after the relative humidity calc in the process
> metar function. I also modified the locale-en.inc to
> print a "The windchill is..." statement in the full
> pretty print. Note the condition that temperature be
> below 40f and wind above 3 mph for the calculation to
> be valid. These conditions are a combination of the F
> and C version requirements. Also, these equation are
> the "new" windchill formula released about Nov 2001.
>
> I hope you guys consider this little addition.
>
>  /*
>    *  Compute windchill if temp < 40f and windspeed >
> 3 mph
>    */
>   if ($decoded_metar['temp_f'] <= '40' &&
> $decoded_metar['wind_miles_per_hour'] > '3'){
>      $decoded_metar['windchill_f'] =
> number_format(35.74 + 0.6215*$decoded_metar['temp_f']
> -
> 35.75*pow($decoded_metar['wind_miles_per_hour'],0.16)
> +
> 0.4275*$decoded_metar['temp_f']*pow($decoded_metar['wind_miles_per
> _hour'],0.16));
>      $decoded_metar['windchill_c'] =
> number_format(13.112 + 0.6215*$decoded_metar['temp_c']
> -
> 13.37*pow(($decoded_metar['wind_miles_per_hour']/1.609),0.16)
> +
> 0.3965*$decoded_metar['temp_c']*pow(($decoded_metar['wind_miles_pe
> r_hour']/1.609),0.16));
>
>     }
>
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