[gradsusr] Wind-chill parameter GrADS -

[L.B.]

Leopoldo,

I retract my statement above. I did find the formula that uses KPH and C,
and it is nearly identical to the first equation you posted. I did notice
you missed a few parts like the exponents. Here is the equation I found:

'define chill =
13.12+0.6215*temp-11.37*pow(wnd,0.16)+0.3965*temp*pow(wnd,0.16)'

This one should get you the correct values using KPH and C.

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


On Sun, Feb 23, 2014 at 4:17 PM, L.B. <bcbass2989 at gmail.com> wrote:

> Leopoldo,
>
> Unfortunately, you'll need to convert your KPH to MPH and C to F to input
> into the equation, and then convert the windchill temp back to C
> afterwards. It's a little tedious, but the equation only works with F and
> MPH. The whole regression equation would have to be changed to work with
> KPH and C by default.
>
> *William (L.B.) LaForce*
> Meteorologist
> Central Michigan University '13
> www.tornadoinsanity.com
>
>
> On Sun, Feb 23, 2014 at 2:30 PM, Leopoldo Alvarez <lap.bolsa at gmail.com>wrote:
>
>>  Hi Willians,
>>
>>  - [1] I used your formulation but using degrees Celsius (ºC) and KPH...
>> I don´t know if it is valid...
>> Now temperature is more low...mmmh
>>
>> 'define chill =
>> 35.74+0.6215*(t-273.15)-35.75*pow((tg1*3.6),0.16)+0.4275*(t-273.15)*pow((tg1*3.6),0.16))'
>>
>>  Date / wind (KPH) / temp (ºC) / windchill (ºC)
>> 2014-FEB-19-13Z  27.5996  18.8929   0.426981
>> 2014-FEB-19-14Z  31.2976  19.2836   0.00337819
>> 2014-FEB-19-15Z  31.2976  19.0446  -0.322477
>>
>>
>>  -[2] In other  formulation the difference was less ...
>> http://www.wrfems.info/viewtopic.php?f=6&t=742
>> - 'tg2' is wind variable (KPH)
>> 'define wis=pow((tg2),0.16)'
>> 'define windchill = 13.112 + 0.6215*(t-273.15) - 11.37*wis +
>> 0.3965*(t-273.15)*wis'
>> 'd windchill'
>>
>> here I find little difference, I wonder...
>>
>>  Date / wind (KPH) / temp (ºC) / windchill (ºC)
>> 2014-FEB-19-13Z  27.5996  18.8929  18.2582
>> 2014-FEB-19-14Z  31.2976  19.2836  18.6358
>> 2014-FEB-19-15Z  31.2976  19.0446  18.3228
>>
>> If your test this web with my data [2], is similar windchill..
>> http://www.csgnetwork.com/windchillcalc.html
>>
>> Best,
>>
>> Leopoldo
>>
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>>
>
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