Denver, Colorado Revisions
MILEPOST 1180
Denver's forecast for Thursday has moved 12°F colder
78°F in the 20260920T18:00Z run, 66°F in the 20260922T12:00Z — the largest revision of any city on the roster. The current run's 10th-to-90th percentile spread at that hour is 14°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Thursday, September 24 at 21Z in Denver, that trail runs from 77.9°F in the 20260920T18:00Z cycle to 65.9°F in the 20260922T12:00Z — a move of -12.0°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 Thursday at 21Z api.weather.city /v1/history (nbm-qmd) |
-12 °F | normal 0.0 °F · 1 of 4 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
13.9 °F | normal 12.0 °F current run |
- Milepost
- 1180 · laid 2026-09-22T22:25:12Z
- Model
- nbm-qmd · cycle 20260922T12:00Z
- 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
- b1333a56845bd4ee1a42bc160208252c1c8f6c82fb77f04466ea80c45394633c
- Machine
- JSON