Edition 2026-10-30 The Ledger Archive API RSS Weather Trader
Milepost
1540

TheForecast Post

A chronicle of American weather and climate  ·  Friday, 30 October 2026

Denver, Colorado Revisions MILEPOST 1538

Denver's forecast for Tuesday has moved 8°F warmer

52°F in the 20261028T12:00Z run, 59°F in the 20261030T06:00Z — the 2nd-largest revision of the 4 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 10°F.

Successive cycles do not merely refresh a forecast; they leave a trail. For Tuesday, November 3 at 21Z in Denver, that trail runs from 51.7°F in the 20261028T12:00Z cycle to 59.4°F in the 20261030T06:00Z — a move of +7.8°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)
7.8 °F normal 0.0 °F · 2 of 4
8 synoptic cycles
10th-to-90th percentile spread at that hour
api.weather.city (nbm-qmd)
10.2 °F normal 7.8 °F
current run
Milepost
1538 · laid 2026-10-30T16:25:25Z
Model
nbm-qmd · cycle 20261030T06:00Z
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
8a8d675cc940fc0edeea00c26cff5361955588a276eb5e405b8c4aa0744f09d8
Machine
JSON