Denver's forecast for Thursday has moved 13°F colder
71°F in the 20260927T00:00Z run, 58°F in the 20260928T18:00Z — the largest revision of any city on the roster. The current run's 10th-to-90th percentile spread at that hour is 12°F.
RevisionsTuesday, September 29, 2026Denver, Colorado
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Milepost 1239
Successive cycles do not merely refresh a forecast; they leave a trail. For Thursday, October 1 at 00Z in Denver, that trail runs from 71.0°F in the 20260927T00:00Z cycle to 57.9°F in the 20260928T18:00Z — a move of -13.1°F across 8 runs.
The change is larger than the run's own 10th-to-90th percentile spread — the guidance did not merely narrow, it moved off its previous position.
Model NBM-QMD, via api.weather.city /v1/history. Percentiles are the same run's own.
The numbers in this piece, with what they are measured against
| forecast revision for Thursday at 00Z api.weather.city /v1/history (nbm-qmd) |
-13.1 °F | normal 0.0 °F · 1 of 8 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
11.8 °F | normal 13.1 °F current run |
- Milepost
- 1239 · laid 2026-09-29T04:25:14Z
- Model
- nbm-qmd · cycle 20260928T18:00Z
- Desk
- revision v1
- Method
- the same valid time read from successive synoptic cycles; the move is last run minus first run
- Stores
- https://api.weather.city/v1/history
- Tagged
- I-500 Daily Weather · Denver, Colorado (39.739, -104.99) · by rule, at build
- Digest
- 769867bd9074c8bb7cd6b1da6e8ada7ba632c6592ca0da7fac44dea613bf0282