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Cossatot River — Daily Analysis: 2026-05-27

Classification: correct Confidence: Model confidence remains high. The prediction was accurate in magnitude and reasonably accurate in timing for a complex multi-band event. No systematic bias detected.

Event Summary

The model accurately predicted a 1.66 ft rise to a peak of 4.36 ft (actual 4.27 ft) during a multi-band rainfall event on wet soils, with excellent magnitude accuracy (2.1% error) and minor timing offset.

Prediction vs Actual

Metric Predicted Actual Error
Peak height 4.36 ft 4.27 ft +0.09 ft
Total rise 1.66 ft

Band Contributions

Band Precip Predicted Rise Intensity Moisture
3 1.24" 1.56 ft HEAVY WET
4 1.05" 0.77 ft HEAVY WET
5 0.99" 0.42 ft MODERATE WET

Empirical Forecast

Headline: Watch — Recent rainfall is in the lower-bound range preceding rises to MEDIUM Settled outcome: None (reached None) LLM said headline was correct: True Notes: The empirical headline predicted a move to 'medium' tier (3.4-5.5 ft). The actual peak was 4.27 ft, which falls squarely in the medium tier. Thus, the headline was borne out.

Analysis

Today's event was driven by significant rainfall across Bands 3, 4, and 5, totaling approximately 1.24", 1.05", and 0.99" respectively. Despite zero precipitation recorded by the gauge sensor, the model correctly attributed the rise to headwater contributions. The predicted peak of 4.36 ft was very close to the actual peak of 4.27 ft, representing a 2.1% error which falls well within the acceptable threshold for a 'correct' classification.

The hydrograph shape was described as 'broad,' consistent with a multi-band event where headwater contributions lag behind near-gauge rainfall. The predicted timing was slightly later than the actual peak (0.4 hours difference), likely due to the faster-than-expected response from the heavy rainfall in Band 3. However, given the conservative nature of the current calibration and the small magnitude of the error, no coefficient adjustments are warranted.

Coefficient Adjustments

No changes made.

Notes

Model confidence remains high. The prediction was accurate in magnitude and reasonably accurate in timing for a complex multi-band event. No systematic bias detected.

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