| Event Window | Onset Lead/Lag | Cessation Lead/Lag | Trad Total | Piezo Total | Δ (P−T) | Peak Trad (in/hr) | Peak Piezo (in/hr) | Peak Winner |
|---|
225 of 457 rainy obs in the lightest bin were piezo-only. The tipping bucket was silent. These are likely vibration artifacts, surface tension events, or heavy mist — not accumulating rain.
Divergence flips negative once rain intensifies. At 0.1–0.2 in/hr, piezo runs −0.039 in/hr below trad on average. At 0.2–0.5 in/hr, the gap widens to −0.058 in/hr. Apr 25 peak: trad 0.26 vs. piezo 0.17 in/hr.
Piezo leads onset by 5–15 min in most events — the tipping bucket needs ~0.01" to register a tip. Piezo also tends to stop 2–10 min sooner, dropping out before the drizzle tail-off fills another tip.