FA-71062 / Weather index computation / Member archive

Cloud and altitude adjusted UV index: irradiance scaling · case 02

Every location reports an extreme UV index.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Clear-sky erythemal irradiance in mW/m2; UVI = irradiance/25. Multiply by the cloud factor for 0..8 octas [1,1,1,0.89,0.89,0.73,0.73,0.31,0.2], by 1 + 0.06*altitude_km (continuous) and by 1.3 over snow. Round half up to an integer; category 0-2 low, 3-5 moderate, 6-7 high, 8-10 very high, 11+ extreme.

Why this case matters

Sun-safety advice is keyed to the published integer UV index and category.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
10 mW/m2 3 octas 1500 m	`[388, "extreme"]`	`[0, "low"]`	Failed

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