Chicago's forecast for Wednesday has moved 11°F colder
55°F in the 20261108T12:00Z run, 44°F in the 20261110T06:00Z — the 3rd-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 9°F.
RevisionsTuesday, November 10, 2026Chicago, Illinois
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Milepost 1651
Successive cycles do not merely refresh a forecast; they leave a trail. For Wednesday, November 18 at 00Z in Chicago, that trail runs from 55.1°F in the 20261108T12:00Z cycle to 44.2°F in the 20261110T06:00Z — a move of -11.0°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 00Z api.weather.city /v1/history (nbm-qmd) |
-11 °F | normal 0.0 °F · 3 of 8 8 synoptic cycles |
| 10th-to-90th percentile spread at that hour api.weather.city (nbm-qmd) |
8.6 °F | normal 11.0 °F current run |
- Milepost
- 1651 · laid 2026-11-10T16:25:30Z
- Model
- nbm-qmd · cycle 20261110T06:00Z
- Desk
- revision v1
- Method
- the same valid time read from successive synoptic cycles; the move is last run minus first run
- Stores
- https://api.weather.city/v1/history
- Tagged
- I-500 Daily Weather · Chicago, Illinois (41.878, -87.63) · by rule, at build
- Digest
- 9174490e6396a7a3ac46a8bc851c5ff944e194da6a4684d73ad2d1692e70b581