Recent early-October winter storms have delivered accumulating snowfall across the northern tier, including up to 10 inches in parts of Minnesota and several inches of mixed precipitation in the Chicago and Detroit areas, aligning with or slightly ahead of historical medians for those locations per NOAA climatology. Strong El Niño conditions, now at very high probability through late 2026, are steering a wetter pattern that supports earlier measurable snow at elevation in the Rockies and northern Midwest while potentially delaying it elsewhere. National Weather Service station data, such as from KIND or MSP, provide the official resolution criteria for first measurable accumulation. Traders should watch updated NWS daily climate reports and short-range model consensus for any additional October events before typical November peaks in the interior Northeast.