Warm Advection with Interesting Details, December 1, 2005

摘要

Cold-season snow events that rely on topographic lift typically have very tight gradients of snowfall with the heaviest amounts close to steep mountain slopes. However, warm advection events are driven by upper-level dynamic forcing that typically creates a much broader area of precipitation, and less spatial variation in the amount of snowfall. These events can often cause the most problems for the Boise metropolitan area, since they can produce widespread snow across the entire Snake River Valley, rather than a small band of snowfall along the front-range of the Boise Mountains. This case from December 1, 2005 is a strong warm advection case and widespread snow might be expected. However, stability characteristics created strong gradients of snowfall within the Snake River Valley.