Edition 2026-10-13 The Ledger Archive API RSS Weather Trader
Milepost
1375

TheForecast Post

A chronicle of American weather and climate  ·  Tuesday, 13 October 2026

Denver, Colorado Revisions MILEPOST 1374

Denver's forecast for Thursday has moved 10°F warmer

59°F in the 20261011T18:00Z run, 69°F in the 20261013T12:00Z — the 2nd-largest revision of the 6 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 Thursday, October 22 at 00Z in Denver, that trail runs from 59.4°F in the 20261011T18:00Z cycle to 69.1°F in the 20261013T12:00Z — a move of +9.7°F across 8 runs.

The change sits well inside the run's own spread, which is the guidance converging rather than reversing.

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 00Z
api.weather.city /v1/history (nbm-qmd)
9.7 °F normal 0.0 °F · 2 of 6
8 synoptic cycles
10th-to-90th percentile spread at that hour
api.weather.city (nbm-qmd)
22.4 °F normal 9.7 °F
current run
Milepost
1374 · laid 2026-10-13T22:25:18Z
Model
nbm-qmd · cycle 20261013T12:00Z
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
1953ff3c9adb2e2dc4227c1a9962091a0373242ee01b59b7f8bd7b60b322d7ef
Machine
JSON