FA-70843 / Weather index computation / Member archive

Heat index regression: regression gate average · case 03

Near 80 degF the reported heat index jumps between the simple and regression formulas at the wrong temperatures.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Input dry-bulb temperature in degF and relative humidity in percent. Compute the simple Steadman estimate 0.5*(T+61+1.2*(T-68)+0.094*RH); if the mean of that estimate and T is below 80 return it, otherwise use the Rothfusz regression with the dry adjustment (RH<13, 80<=T<=112) or the humid adjustment (RH>85, 80<=T<=87). Round to 0.1 degF.

Why this case matters

Heat advisories are issued from this value; a wrong branch changes public warnings.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
81.5F at 12% RH	`79.9`	`79.1`	Failed

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