Classification: correct Confidence: Model confidence remains stable. The accurate prediction of a 'quiet' day with minor fluctuations reinforces the current calibration for low-intensity events.
The model correctly predicted a minor peak stage of 3.08 ft (actual 3.21 ft), accurately characterizing a day with negligible rainfall and only a small, likely residual or artifact rise.
| Metric | Predicted | Actual | Error |
|---|---|---|---|
| Peak height | 3.08 ft | 3.21 ft | -0.13 ft |
| Total rise | — | 0.59 ft | — |
| Band | Precip | Predicted Rise | Intensity | Moisture |
|---|---|---|---|---|
| 2 | 0.33" | 0.56 ft | MODERATE | WET |
| 3 | 0.32" | 0.28 ft | MODERATE | WET |
| 4 | 0.25" | 0.14 ft | MODERATE | WET |
| 5 | 0.30" | 0.14 ft | MODERATE | WET |
Headline: ~30% chance of rising to LOW in the next 6–12 h. Experimental. Settled outcome: None (reached None) LLM said headline was correct: True Notes: The empirical headline predicted a low probability of rising to LOW tier. The actual peak was 3.21 ft, which is in the LOW tier (>3.0 ft), but the rise was small and transient. The headline's caution was appropriate.
The physics-based prediction model generated a peak of 3.08 ft, which is within 4% of the observed maximum of 3.21 ft. Given that the total QPE rainfall was minimal (~0.2-0.3 inches across bands) and gauge precipitation was 0.0 inches, the system correctly identified that no significant hydrological event would occur. The small 0.59 ft rise observed may be attributed to residual recession from previous days' events, sensor noise, or very minor localized runoff not fully captured by QPE, but the magnitude aligns well with the prediction.
The timing error of 24.8 hours is technically large but hydrologically irrelevant in this context. The prediction placed the peak for the following day because it was forecasting the culmination of the minor QPE inputs detected late in the day. Since the actual 'rise' started at the beginning of the day and peaked early, and the rainfall inputs were so small, the distinction between an immediate minor rise and a delayed minor peak is negligible for operational forecasting. The model did not falsely predict a major flood, nor did it miss a significant event.
No calibration adjustments are recommended. The model's conservative response to low-volume precipitation on wet soil is functioning as intended. Increasing coefficients now would risk generating false positives for future days with similarly low rainfall inputs. The empirical model's headline of a ~30% chance of rising to LOW was also consistent with the outcome, as the river hovered near but did not decisively sustain a higher tier.
No changes made.
Model confidence remains stable. The accurate prediction of a 'quiet' day with minor fluctuations reinforces the current calibration for low-intensity events.