Denver, Colorado Revisions
MILEPOST 1190
Denver's forecast for Tuesday has moved 11°F colder
77°F in the 20260921T12:00Z run, 66°F in the 20260923T06:00Z — the 2nd-largest revision of the 8 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 22°F.
Successive cycles do not merely refresh a forecast; they leave a trail. For Tuesday, September 29 at 21Z in Denver, that trail runs from 77.5°F in the 20260921T12:00Z cycle to 66.0°F in the 20260923T06:00Z — a move of -11.4°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 Tuesday at 21Z api.weather.city /v1/history (nbm-qmd) |
-11.4 °F | normal 0.0 °F · 2 of 8 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
22.5 °F | normal 11.4 °F current run |
- Milepost
- 1190 · laid 2026-09-23T17:25:13Z
- Model
- nbm-qmd · cycle 20260923T06:00Z
- 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
- fa0b51a28ad28eb130217612c3fa4e49c911f862ed9ebcd2820a6a270808887d
- Machine
- JSON