Tide correction of daily maxima increased their match with corrected high minima at six US gauges in 2015-2024

We tested maximum-date selection while holding corrected high-minimum labels fixed at six US tide gauges in 2015-2024. We reused 21,279 station-days from verified published NOAA evidence. Each selector used its own calendar-month upper 5% threshold. Corrected maximum dates selected corrected high-minimum days on 49.05% of flagged dates, compared with 28.36% for raw maximum dates. The equal-site gain was 20.69 percentage points. A 95% three-year block interval with refitted thresholds was 16.72 to 23.60 points. All six site point changes were positive. The adjusted Seattle interval included zero. A next-year maximum correction gave 23.00%, below the same-date correction. This post-result follow-up adds crossed labels to a prior tail-pairing report on the same data. It is not an independent confirmation. The corrected minimum is a model-dependent target, not a validated surge or drainage measure. Ten years, selected sites, daily extrema, retrospective tide predictions and block assumptions limit inference. The package gives input evidence, exact source hashes, code, all draws, figures and independent checks.

daily extrema · NOAA CO-OPS · tide correction · tail dependence · event selection · crossed labels · block bootstrap