FA-71289 / Weather index computation / Member archive

Pasquill-Gifford stability class: night cloud threshold · case 04

Four-octa nights are treated as clear and too stable.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Wind class: <2, <3, <5, <6, >=6 (index 0..4). 8 octas returns "D" day or night. Day: tables by insolation strong [A,A-B,B,C,C], moderate [A-B,B,B-C,C-D,D], slight [B,C,C,D,D]; unknown insolation returns None. Night: >=4 octas [E,E,D,D,D], <=3 octas [F,F,E,D,D].

Why this case matters

Air-dispersion screening models choose plume spread from the stability class.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
wind 2.0 night None 4 octas	`"F"`	`"E"`	Failed

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