Denver, Colorado Revisions
MILEPOST 1168
Denver's forecast for Friday has moved 8°F colder
79°F in the 20260919T12:00Z run, 70°F in the 20260921T06:00Z — the 2nd-largest revision of the 5 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 15°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Friday, September 25 at 00Z in Denver, that trail runs from 78.6°F in the 20260919T12:00Z cycle to 70.4°F in the 20260921T06:00Z — a move of -8.2°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 Friday at 00Z api.weather.city /v1/history (nbm-qmd) |
-8.2 °F | normal 0.0 °F · 2 of 5 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
15.3 °F | normal 8.2 °F current run |
- Milepost
- 1168 · laid 2026-09-21T16:25:13Z
- Model
- nbm-qmd · cycle 20260921T06:00Z
- Desk
- revision v1
- Method
- the same valid time read from successive synoptic cycles; the move is last run minus first run
- Source
- https://api.weather.city/v1/history
- Digest
- 908243ed785eb6a67abc52dc8ab226ca9eb17c67b71dda75054a6d628527f67e
- Machine
- JSON