FA-71105 / Weather index computation / Member archive

Fosberg fire weather index: cubic damping term · case 05

Moist conditions show too much fire potential.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Equilibrium moisture m: RH<10: 0.03229+0.281073RH-0.000578RH*T; 10<=RH<=50: 2.22749+0.160107RH-0.01478T; RH>50: 21.0606+0.005565RH^2-0.00035RH*T-0.483199RH. x=m/30; eta=1-2x+1.5x^2-0.5x^3; FFWI = eta*sqrt(1+U^2)/0.3002 clamped to [0,100] and rounded to 0.1.

Why this case matters

Red flag warnings and fire-weather dashboards chart FFWI.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
40F 51% RH wind 0 mph	`1.7`	`1.6`	Failed

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