Another third of Canadian tornadoes strike Southern Ontario, especially in the region between the Great Lakes and the nation's capital city, Ottawa. Tornadoes in this region are triggered or augmented by lake breeze fronts from Lake Huron, Lake Erie, Lake Ontario, and Georgian Bay. Tornadoes do not often hit lake shadow regions, although they are not unknown, and some, such as the 2011 Goderich tornado, and the 2018 Ottawa tornadoes have been violent. However, most Ontario tornadoes are concentrated in a narrow corridor from Windsor to Ottawa. Tornadoes up to EF4 in strength have been documented in this region. Southwestern Ontario weather is strongly influenced by its peninsular position between the Great Lakes. As a result, increases in temperature in this region are likely to increase the amount of precipitation in storms due to lake evaporation. Increased temperature contrasts may also increase the violence and possibly the number of tornadoes.