FA-71234 / Weather index computation / Member archive

Antecedent precipitation index: sensor glitch clamp · case 04

A negative tipping-bucket glitch lowers soil moisture.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

obs are [day, precip_mm] in any order; process in ascending day order (stable for equal days). Between observations API decays by k^(day gap); several reports on the same day accumulate without decay; negative precipitation is a sensor glitch treated as 0. Return API after each observation, rounded to 0.01.

Why this case matters

Flash-flood guidance and soil wetness models use API as a moisture state.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
basin 14	`[-1.0, 29.0, 29.65, 25.2, 23.21, 11.12]`	`[0.0, 30.0, 30.5, 25.93, 23.73, 12.39]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.