Overview
- NOAA’s Climate Prediction Center expects waves of Pacific storms near Nov. 27, increasing odds of heavy mountain snow along the West Coast.
- In California, major low‑elevation cities look wet and chilly rather than snowy, while the Sierra Nevada is favored for accumulating snow and possible chain controls on I‑80 and US‑50.
- National outlooks depict a split pattern with warmer‑than‑normal conditions across much of the East and South and a wetter setup in the West.
- Great Lakes areas face an elevated lake‑effect snow risk under patterns linked to La Niña and the Madden–Julian Oscillation, whereas New York City is forecast to be cold with little chance of significant snow.
- Chicago’s Thanksgiving Day forecast calls for highs near 40°F with morning showers and a nighttime chance of a rain‑snow mix, and meteorologists urge travelers to check updated local advisories.