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Milepost
1587

TheForecast Post

A chronicle of American weather and climate  ·  Friday, 6 November 2026

Atlanta, Georgia Revisions MILEPOST 1586

Atlanta's forecast for Friday has moved 7°F colder

66°F in the 20261103T18:00Z run, 59°F in the 20261105T12:00Z — 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 19°F.

Successive cycles do not merely refresh a forecast; they leave a trail. For Friday, November 13 at 18Z in Atlanta, that trail runs from 66.3°F in the 20261103T18:00Z cycle to 59.5°F in the 20261105T12:00Z — a move of -6.8°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 Friday at 18Z
api.weather.city /v1/history (nbm-qmd)
-6.8 °F normal 0.0 °F · 3 of 6
8 synoptic cycles
10th-to-90th percentile spread at that hour
api.weather.city (nbm-qmd)
19.1 °F normal 6.8 °F
current run
Milepost
1586 · laid 2026-11-05T22:25:27Z
Model
nbm-qmd · cycle 20261105T12:00Z
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
78bd78df2c54c5780c92fc244d19fec4a0fdfae5656788d0ec0145712e54c0e4
Machine
JSON