Why track changes instead of showing one frozen map?
Seasonal outlooks evolve as ENSO, ocean temperatures and model guidance change. This archive records material changes so you can see whether a local winter signal is strengthening, weakening or simply being refined.
September 17, 2026
Warmth expanded east; the southern wet corridor remained dominant.
CPC extended favored warmth across the Great Lakes and Northeast, kept the strongest precipitation signal across the southern and central U.S., and highlighted a negative PDO as an important complication.
See what changed →How we use each release
We update the checker only when the official CPC release materially changes the evidence. The site separates temperature, precipitation and snow because a wetter signal does not automatically imply more snowfall.
Official source: NOAA CPC long-lead seasonal outlook discussion ↗. Next scheduled release: October 15, 2026.