Denver's forecast for Wednesday has moved 8°F colder
68°F in the 20260927T06:00Z run, 60°F in the 20260929T00:00Z — the 3rd-largest revision of the 6 cities on the roster that moved at all. 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 1243
Successive cycles do not merely refresh a forecast; they leave a trail. For Wednesday, September 30 at 21Z in Denver, that trail runs from 67.7°F in the 20260927T06:00Z cycle to 59.8°F in the 20260929T00:00Z — a move of -7.9°F across 8 runs.
The change is about half the run's 10th-to-90th percentile spread, so the earlier forecast is still inside the current range of outcomes.
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 Wednesday at 21Z api.weather.city /v1/history (nbm-qmd) |
-7.9 °F | normal 0.0 °F · 3 of 6 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
12.1 °F | normal 7.9 °F current run |
- Milepost
- 1243 · laid 2026-09-29T10:25:14Z
- Model
- nbm-qmd · cycle 20260929T00:00Z
- 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
- 3d1670abe9a7a91460e69fd3b6e84c238c45dd4f565bc710acc61d49a847136a