 The storm , an extratropical cyclone , originated as the convergence of two major storm fronts , fueled by the lakes ' relatively warm waters — a seasonal process called a " November gale " . It produced 90 mph ( 145 km / h ) wind gusts , waves over 35 feet ( 11 m ) high , and whiteout snowsqualls . Analysis of the storm and its impact on humans , engineering structures , and the landscape led to better forecasting and faster responses to storm warnings , stronger construction ( especially of marine vessels ) , and improved preparedness . 
