FA-71144 / Weather index computation / Member archive

Haines lower-atmosphere severity index: stability lapse direction · case 04

Strong lapse rates score as stable while inversions score as unstable.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

temps/dews map pressure level (hPa) to degC. low: stability T950-T850 (<=3:1, <=7:2, else 3), moisture T850-Td850 (<=5:1, <=9:2, else 3); mid: T850-T700 (<=5, <=10), T850-Td850 (<=5, <=12); high: T700-T500 (<=17, <=21), T700-Td700 (<=14, <=20). Unknown elevation returns None. Return [sum, label] with 2-3 very low, 4 low, 5 moderate, 6 high.

Why this case matters

Fire behaviour analysts use the Haines index for plume-dominated fire potential.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
mid elevation sounding	`[3, "very low"]`	`[4, "low"]`	Failed

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