Edition 2026-09-19 The Ledger Archive API RSS Weather Trader
Milepost
1135

TheForecast Post

A chronicle of American weather and climate  ·  Saturday, 19 September 2026

Kansas City, Missouri Revisions MILEPOST 1134

Kansas City's forecast for Thursday has moved 9°F colder

70°F in the 20260916T18:00Z run, 61°F in the 20260918T12:00Z — the 3rd-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 12°F.

Successive cycles do not merely refresh a forecast; they leave a trail. For Thursday, September 24 at 15Z in Kansas City, that trail runs from 69.9°F in the 20260916T18:00Z cycle to 60.9°F in the 20260918T12:00Z — a move of -9.0°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 15Z
api.weather.city /v1/history (nbm-qmd)
-9 °F normal 0.0 °F · 3 of 6
8 synoptic cycles
10th-to-90th percentile spread at that hour
api.weather.city (nbm-qmd)
11.7 °F normal 9.0 °F
current run
Milepost
1134 · laid 2026-09-18T23:25:15Z
Model
nbm-qmd · cycle 20260918T12:00Z
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
07428d336218036c5dd94151dfb88d90c3b1cae3f0cf44855474a1fd32fd6962
Machine
JSON