Federal climate forecasters say the atmosphere is shifting into a more typical late-season La Niña setup, with the main storm track sliding north as milder air flows in from the Pacific. That favors warmer-than-normal conditions across most of the Rockies, Plains, Midwest, and East, with the strongest signal for warmth centered on the south-central Plains and lower Mississippi Valley. Colder-than-normal temperatures are most likely in Alaska and may clip parts of the northern High Plains and Pacific Northwest.