The polar vortex is forecast to weaken unusually early, and that could lead to more persistent cold weather in at least parts of the U.S. in December. Last week, almost 100 daily record lows were tied ...

You’d be forgiven for being skeptical of a cold, snowy December. Recent years have often brought late starts to winter. The last colder-than-normal December (using the modern 1991–2020 average, which ...

Federal forecasters are tracking a weakening polar vortex that could funnel another round of Arctic air into the Northeast during the second half of March 2026. Diagnostic data from NOAA’s Climate ...