After a mild January and February, Lake Superior ice levels are lower than normal for this time of year, say Canadian federal observers. By the middle of February, Superior’s ice thickness in the vicinity of Thunder Bay, Ontario was estimated to be only 45 centimeters, about 20 cm less for the same time last year and 15 cm less than the seasonal average, according to data provided by the Meteorological Service of Canada. Read the full story by the Chronicle Journal.