Denver, Colorado Revisions
MILEPOST 1174
Denver's forecast for Thursday has moved 11°F colder
80°F in the 20260920T00:00Z run, 69°F in the 20260921T18:00Z — the largest revision of any city on the roster. The current run's 10th-to-90th percentile spread at that hour is 16°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 79.8°F in the 20260920T00:00Z cycle to 68.6°F in the 20260921T18:00Z — a move of -11.2°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 Thursday at 21Z api.weather.city /v1/history (nbm-qmd) |
-11.2 °F | normal 0.0 °F · 1 of 5 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
15.6 °F | normal 11.2 °F current run |
- Milepost
- 1174 · laid 2026-09-22T04:25:17Z
- Model
- nbm-qmd · cycle 20260921T18:00Z
- 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
- eae7ff88c577f0d3d2247a4adc83f5f4072b31edec0099622b8b9fb7229e1651
- Machine
- JSON