Background. Aseptic meningitis is an illness characterized by serous inflammation of the linings of the brain (i.e., meninges), usually with an accompanying mononuclear pleocytosis. Clinical manifestations vary, with headache and fever predominating.
Lake Superior 1  ... is the largest freshwater lake in the world by surface area and the third largest by volume (Lake Baikal in Siberia and Lake Tanganyika in East Africa contain more water). 2  could hold all the water in the other Great Lakes, plus THREE MORE Lake Eries. 11,000 years ago: Glacial Lake Duluth, the precursor to Lake Superior, forms as the ice sheet retreats northeastward. 2  The lake's torrential outflow near present-day Duluth carves the St. Croix River Valley and feeds the Mississippi River.
Lake Superior's surface water temperature in summer has warmed twice as much as the air above it since 1980. Per decade since 1980, surface water temperature in summer has increased about 2 Â°F (1 Â°C), while regional air temperature has increased 1 Â°F (0.5 Â°C). ,Lake Superior's ice cover is diminishing.s shown on the graph below, over the last 100 years, Lake Superior has fluctuated about 2.5 feet (0.8 m). The high water level in October of 1985 was 3.9 feet (1.19 m) above a low in March of 1926. The data in this graph originated from the U.S. Army Corps of Engineers-Detroit District.