{
 "number": 1419,
 "headline": "Atlanta's forecast for Sunday has moved 8\u00b0F colder",
 "standfirst": "56\u00b0F in the 20261016T00:00Z run, 49\u00b0F in the 20261017T18:00Z \u2014 the 2nd-largest revision of the 5 cities on the roster that moved at all. The current run's 10th-to-90th percentile spread at that hour is 9\u00b0F.",
 "desk": "revision",
 "dateline": {
  "place": "Atlanta",
  "state": "Georgia",
  "lat": 33.749,
  "lon": -84.388,
  "site_key": "georgia",
  "site_name": "Forecast Georgia",
  "site_url": "https://forecastgeorgia.com",
  "accent": "#d99a63"
 },
 "edition": "2026-10-18",
 "published": "2026-10-18T04:25:17Z",
 "updated": null,
 "access": "free",
 "body_html": "<p>Successive cycles do not merely refresh a forecast; they leave a trail. For Sunday, October 25 at 12Z in Atlanta, that trail runs from <span class=\"mono\">56.2\u00b0F</span> in the <span class=\"mono\">20261016T00:00Z</span> cycle to <span class=\"mono\">48.6\u00b0F</span> in the <span class=\"mono\">20261017T18:00Z</span> \u2014 a move of <span class=\"mono\">-7.6\u00b0F</span> across 8 runs.</p><p>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.</p><p class=\"note\">Model NBM-QMD, via api.weather.city /v1/history. Percentiles are the same run's own.</p>",
 "body_key": null,
 "teaser_html": "",
 "claims": [
  {
   "text": "forecast revision for Sunday at 12Z",
   "value": -7.6,
   "unit": "\u00b0F",
   "normal": 0.0,
   "rank": 2,
   "of": 5,
   "period": "8 synoptic cycles",
   "source": "api.weather.city /v1/history (nbm-qmd)"
  },
  {
   "text": "10th-to-90th percentile spread at that hour",
   "value": 8.8,
   "unit": "\u00b0F",
   "normal": 7.6,
   "rank": null,
   "of": null,
   "period": "current run",
   "source": "api.weather.city (nbm-qmd)"
  }
 ],
 "assets": [],
 "provenance": {
  "built_at": "2026-10-18T04:25:16Z",
  "model": "nbm-qmd",
  "cycle": "20261017T18:00Z",
  "stores": [
   "https://api.weather.city/v1/history"
  ],
  "mint_sha256": null,
  "pairing_rule": "the same valid time read from successive synoptic cycles; the move is last run minus first run",
  "detector": "revision",
  "detector_version": "1",
  "inputs": {
   "city": "Atlanta",
   "lat": 33.749,
   "lon": -84.388,
   "runs": 8,
   "valid": "2026-10-25T12:00:00",
   "first_run": "20261016T00:00Z",
   "last_run": "20261017T18:00Z"
  }
 },
 "strength": 0.609,
 "tags": [
  "revision",
  "guidance",
  "georgia"
 ],
 "supersedes": null,
 "superseded_by": null,
 "source": "wire",
 "canonical": null,
 "slug": "atlanta-s-forecast-for-sunday-has-moved-8-f-colder",
 "path": "/mp/1419/",
 "url": "https://forecastpost.com/mp/1419/",
 "desk_label": "Revisions",
 "digest": "a16c0a3a238e1afc2f4a49db922d15ec3dd679a9c0b2494b398fac679021e79f"
}