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Milepost
1526

TheForecast Post

A chronicle of American weather and climate  ·  Thursday, 29 October 2026

New York, New York Revisions MILEPOST 1526

New York's forecast for Wednesday has moved 9°F warmer

59°F in the 20261027T06:00Z run, 67°F in the 20261029T00:00Z — the 3rd-largest revision of the 9 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 9°F.

Successive cycles do not merely refresh a forecast; they leave a trail. For Wednesday, November 4 at 18Z in New York, that trail runs from 58.6°F in the 20261027T06:00Z cycle to 67.4°F in the 20261029T00:00Z — a move of +8.8°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 18Z
api.weather.city /v1/history (nbm-qmd)
8.8 °F normal 0.0 °F · 3 of 9
8 synoptic cycles
10th-to-90th percentile spread at that hour
api.weather.city (nbm-qmd)
8.5 °F normal 8.8 °F
current run
Milepost
1526 · laid 2026-10-29T10:25:24Z
Model
nbm-qmd · cycle 20261029T00:00Z
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
422e9e5908b1760d68d7116a623f55d0de94c171a5c837d6d89caa8ceb8a7c72
Machine
JSON