FA-71260 / Weather index computation / Member archive

Aviation flight category: ceiling cover types · case 05

A scattered layer at 400 ft makes a clear day LIFR.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

layers are [cover, height_ft]; the ceiling is the lowest BKN, OVC or VV layer (None if none). Ceiling class: None or >3000 VFR, 1000-3000 MVFR, 500-999 IFR, <500 LIFR. Visibility class: >5 VFR, 3-5 MVFR, 1 to <3 IFR, <1 LIFR. Report [ceiling, worse of the two classes].

Why this case matters

Pilots and dispatch use flight categories for go/no-go and alternate planning.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
vis 0.5 layers [['SCT', 800], ['BKN', 1500], ['BKN', 2500]]	`[800, "LIFR"]`	`[1500, "LIFR"]`	Failed

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