Great Lakes Mesoscale convective complexs or MCCs can cause damage to wide swaths of forest and shatter glass in city buildings. These storms mainly occur during the night, and the systems sometimes have small embedded tornadoes, but more often straight-line winds accompanied by intense lightning. Historically, the Great Lakes, in addition to their lake ecology, were surrounded by various forest ecoregions (except in a relatively small area of southeast Lake Michigan where savanna or prairie occasionally intruded). Logging, urbanization, and agriculture uses have changed that relationship. In the early 21st century, Lake Superior's shores are 91% forested, Lake Huron 68%, Lake Ontario
Great Lakes Airlines (Canada) 440 propliners and Convair 580 turboprops, were older and subject to vibrations during take-off, resulting in passengers nicknaming the company "Great Shakes". Convair 580 turboprops operated by Air Ontario prompted the nickname "Scare Ontario". Great Lakes Airlines was serving the following destinations in Ontario province in Canada with scheduled passenger flights operated with Convair aircraft in 1979: Great Lakes Airlines (Canada) Great Lakes Airlines was a regional airline in Canada. It was formed in 1958 in Sarnia, Ontario by John Blunt and by 1983 became Air Ontario Ltd. In June 1987 Air Ontario Ltd. merged with Austin Airways to form