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Milepost
1359

TheForecast Post

A chronicle of American weather and climate  ·  Sunday, 11 October 2026

Denver, Colorado Revisions MILEPOST 1359

Denver's forecast for Wednesday has moved 14°F colder

68°F in the 20261009T18:00Z run, 53°F in the 20261011T12:00Z — the 2nd-largest revision of the 10 cities on the roster that moved at all. 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 Wednesday, October 14 at 21Z in Denver, that trail runs from 67.6°F in the 20261009T18:00Z cycle to 53.4°F in the 20261011T12:00Z — a move of -14.1°F across 8 runs.

The change is larger than the run's own 10th-to-90th percentile spread — the guidance did not merely narrow, it moved off its previous position.

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)
-14.1 °F normal 0.0 °F · 2 of 10
8 synoptic cycles
10th-to-90th percentile spread at that hour
api.weather.city (nbm-qmd)
14.1 °F normal 14.1 °F
current run
Milepost
1359 · laid 2026-10-11T22:25:15Z
Model
nbm-qmd · cycle 20261011T12:00Z
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
517530e46189efb0bdd6ee8c88247d54d70f6808fe29177cb3bdb47083960868
Machine
JSON