FA-71334 / Weather index computation / Member archive

Hourly snowfall and settled depth: settling order · case 04

Freshly fallen snow is compacted in the same hour it falls; depth under-reads after bursts.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

hours are [liquid_mm, temp_c]. Snow-to-liquid ratio: T>1 rain (0), 0<T<=1: 5, -5<T<=0: 10, -12<T<=-5: 15, T<=-12: 20. New snow cm = liquid*ratio/10. Each hour the existing depth settles by 2% before the new snow is added; rain (ratio 0, liquid > 0) melts 0.5 cm per mm, floored at 0. Return [total new snowfall rounded 0.1, final depth rounded 0.1].

Why this case matters

Winter road maintenance and snow reports need both new snowfall and settled depth.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
storm 9	`[6.0, 5.6]`	`[6.0, 5.8]`	Failed

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