Lyndz olagueralyndonmark429 at gmail.com
Sat Feb 13 06:24:05 EST 2021

```Dear GrADS experts,

I am calculating the heat stress index using the following:

'define temp = t2 - 273.16'

'define tempF = (temp *1.8) +32'

'define rh = rh2'

'define HI = -42.379 + (2.04901523*tempF) +
(10.14333127*rh)-(0.22475541*tempF*rh) - (0.00683783*pow(tempF,2)) -
(0.05481717*pow(rh,2)) + (0.00122874*pow(tempF,2)*rh) +
(0.00085282*tempF*pow(rh,2)) - (0.00000199*pow(tempF,2)*pow(rh,2))'

if (rh < 13 & tempF >= 80 & tempF <= 112)

'define HIA = HI'

else

'define HIA = HI-((13-rh)/4)*sqrt(17-abs(tempF-95)/17)'

endif

if (rh > 85 & tempF >= 80 & tempF <= 87)

'define HIA = HI + 0.5*(tempF + 61 + ((tempF-68)*1.2) + (rh*0.094))'

endif

This is based on this link:
https://www.wpc.ncep.noaa.gov/html/heatindex_equation.shtml

Adjustments are added to and subtracted from the HI equation if the
temperature falls at a certain range.

Is this the correct way for doing this?
if (rh < 13 & tempF >= 80 & tempF <= 112)
if (rh > 85 & tempF >= 80 & tempF <= 87)

Or maybe there is a better approach for this....

I'll appreciate any comment/suggestion on this.

Sincerely,

*Lyndon Mark P. Olaguera, Ph.D.*
+63 906 023 9926
Manila Observatory,
Ateneo de Manila University Campus
Loyola Heights, Quezon city
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