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The same system responsible for six tornadoes in southeastern Minnesota and a 75 mph hurricane-force wind gust in northern Iowa last night is racing eastward. The upper-level trough behind the violent storm is an assault by autumn against the subtropical air-masses of summer. Behind the storms, the coolest air since May will gradually overspread the Northeast just in time for the first day of Autumn. But the crisp, cozy weather will come at a steep cost. Powerful wind gusts are expected to rip through the Lower Great Lakes region, with a few tornadoes to boot. The last of summer’s subtropical high pressure systems is clinging onto life. A weakening upper-level ridge centered centered over the lower Mid-Atlantic coast will have no defenses against the incoming upper-level trough. The surface low-pressure system associated with the trough will travel well to the north of the border through central Ontario and Québec Friday.…