Provided by the US Forest Service, this page on Atmospheric Disturbance Climatology offers multiple series of spectacular color figures depicting geographic distributions of the major abiotic factors influencing biota in the north central and northeastern US. For instance, daily maximum and minimum temperature data from the National Climate Data Center (NCDC) are displayed as color maps, showing average monthly max/min temperatures and occurrences of 'extreme' max/min temperatures. Also shown are color maps of Precipitation (averages and extremes), Spring Freezes, Fire Weather patterns, Ozone Concentrations (in the Great Lakes region), and Pine Shoot Beetle Outbreaks (1992-1998), as well as explanations of the methods used to summarize the data. For ecologists seeking broad summaries of abiotic conditions at the intermediate landscape scale, this Website will serve a valuable purpose. For others curious about medium-scale climatic processes, the numerous color images offer a wealth of information. Two additional sections on Winds and Winter Thaws are under construction and will be launched shortly.