## Re: Indoor Apparent Temperature

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• I think the 3-1 was a typo and they meant 5-1. I guess the original research by NOAA was lost and they basically used the table to re-create the formula.
Message 1 of 4 , Jun 8, 2011
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I think the 3-1 was a typo and they meant 5-1.

I guess the original research by NOAA was lost and they basically used the table to re-create the formula.

--- In wuhu_software_group@yahoogroups.com, David Lipper <glenvilleweather@...> wrote:
>
> Thanks!
>
> Hmm, the formula gives a lower number for IAT (Heat Index) than the actual temperature.
> That seems counter-intuitive. It talks about mean error of .608, and maximum error of 1.98, but dismisses that.
> It also refers to numbers in figure 3-1, but the paper is missing that figure.
>
> The tables they do include (5-1) cover only 61 to 75, so perhaps this formula is not appropriate for temperatures above 75.
> In fact, the cause given for using this formula was that the conventional (US) heat index is only suitable for 80+F.
>
> On 2011-06-08 17:29, wuhu_software wrote:
> >
> >
> > David,
> >
> > In the files section, check out:
> >
> > Files \ Weather Algorithms and Formula \ Indoor Comfort Index.doc
> >
> > --- In wuhu_software_group@yahoogroups.com <mailto:wuhu_software_group%40yahoogroups.com>, David Lipper <glenvilleweather@>
> > wrote:
> > >
> > > Hi, Heath, how do you calculate the indoor apparent temperature?
> > >
> > > Using version 1,0,216,184, I get (by hovering) IAT=83.3F at IT=84.2F, IH=50.0%. That doesn't seem right.
> > >
> > > A calculator at http://www.weatherimages.org/data/heatindex.html shows IAT=85F with the same input values.
> > >
> >
>
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