[gradsusr] Wind-chill parameter GrADS -

[L.B.]

Leopoldo,

Based on the first link you mentioned, that formula looks similar to the
old windchill formula. The newer one which you used in your two
calculations are correct. I should mention that the windchill formula is
meant for temperatures of 50F(10C) or less. This is the reason why your
windchill values are only slightly lower than your actual temperature
values.

*William (L.B.) LaForce*
Meteorologist
Central Michigan University '13
www.tornadoinsanity.com


On Mon, Feb 24, 2014 at 8:43 AM, Leopoldo Alvarez <lap.bolsa at gmail.com>wrote:

>  Hi Willians,
>
>  Look at this webpage->
> http://www.lenntech.com/calculators/wind/wind-chill.htm
> 30 km/h (wind)
> 18ºC (temperature)
> 12.1ºC (windchill)
>
> - - - - - - - - - - -
>
>  In our examples ....
> I use your formulation...
>  - [1] I use your formulation corrected (convert KPH to MPH and K to F to
> input into the equation)
>
> 'far=((9/5)*t)-459.67'
> 'mph=tg1*2.236936'
> 'define chill =
> 35.74+0.6215*far-35.75*pow(mph,0.16)+0.4275*far*pow(mph,0.16)'
> 'chill2=(chill-32)/1.8'
> 'd chill2'
>
>  Date / wind (MPH) / temp (ºF) / windchill (ºF)
> 2014-FEB-19-13Z  17.1496   66.0072   64.8952
> 2014-FEB-19-14Z  19.4474   66.7105   65.5746
> 2014-FEB-19-15Z  19.4474   66.2803   65.0114
>
>
>  - [2] This is the other proposal that you have shown me ...
>
> 'define chill =
> 13.12+0.6215*(t-273.15)-11.37*pow((tg1*3.6),0.16)+0.3965*(t-273.15)*pow((tg1*3.6),0.16)'
>
>  Date / wind (KPH) / temp (ºC) / windchill (ºC)
> 2014-FEB-19-13Z   27.5996  18.8929  18.2662
> 2014-FEB-19-14Z   31.2976  19.2836  18.6438
> 2014-FEB-19-15Z   31.2976  19.0446  18.3308
>
> I still think that with a wind of 30 km/h and a temperature of 18.8 °C,
> the windchill can not be a 'lower tenths'..
>  I'm confused, and I have no security ...
> http://www.easysurf.cc/cnver16.htm
> http://es.easycalculation.com/weather/wind-chill.php
>
> Best,
>
> Leopoldo Alvarez
>
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