12/10/2025
December 10: Classic La Nina Jetstream pattern through the next several days! As this GIF shows, the jet stream (a narrow band of strong winds high up in the troposphere) will be forced northward as high pressure builds in the western to central U.S. Conversely, troughing or low pressure dominates eastern U.S.
What does this mean for us? This pattern will generally promote dry, mostly sunny, and warmer than average temperatures through an extended time period. This is attributed to the emergent effects of subsidence from the ridge, down sloping winds, and meaningful moisture being swept eastward away from the viewing area.
The High/Western plains may experience bouts of strong winds too due to a process called "lee cyclogenesis", which occurs when strong winds intercept the Rockies, warm the low-level, and thus reduce the air pressure.