FA-70944 / Weather index computation / Member archive

Shade apparent temperature: saturation vapour pressure denominator · case 04

Hot humid values are inflated while cold values are slightly low.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input air temperature degC, RH percent, wind in km/h measured at 10 m. e = RH/100*6.105*exp(17.27*Ta/(237.7+Ta)) hPa; wind in m/s = km/h / 3.6; AT = Ta + 0.33e - 0.70ws - 4.00 rounded to 0.1.

Why this case matters

Feels-like temperature on consumer forecasts uses this non-radiative apparent temperature.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
20 C 10% RH wind 10 km/h	`14.9`	`14.8`	Failed

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