The Great Lakes Storm of 1913 (historically referred to as the "Big Blow", the "Freshwater Fury", and the "White Hurricane") was a blizzard with hurricane-force winds that devastated the Great Lakes Basin in the Midwestern United States and Southwestern Ontario, Canada, from November 7 to 10, 1913. The storm was most powerful on November 9, battering and overturning ships on four of the five Great Lakes, particularly Lake Huron.

The storm was the deadliest and most destructive natural disaster to hit the lakes in recorded history. More than 250 people were killed. Shipping was hard hit; 19 ships were destroyed, and 19 others were stranded. About $1 million of cargo weighing about 68,300 tons—including coal, iron ore, and grain—was lost. The storm impacted many cities including; Duluth, Minnesota - Chicago, Illinois and Cleveland, Ohio which received 22 in (56 cm) of snow combined with winds up to 79 mph (127 km/h) and was paralyzed for days.

The extratropical cyclone originated when two major storm fronts that were fueled by the lakes' relatively warm waters—a seasonal process called a "November gale"—converged. It produced wind gusts of 90 mph (140 km/h), waves estimated at over 35 feet (11 m) high, and whiteout snowsqualls. Winds exceeding hurricane force occurred over four of the Great Lakes for extended periods creating very large waves. The large size of the Great Lakes provides wind fetches (the length of water over which a given wind has blown without obstruction) of hundreds of miles, allowing huge waves to form. Rogue waves are known to occur on the Great Lakes, including waves reinforced by reflections from the vertical shores of some of the Great Lakes. Waves on the Great Lakes (especially the shallower ones) can be steeper and closer together than on the ocean allowing less recovery time between waves. Compared to the ocean, the Great Lakes also have less maneuvering "sea room" and closer proximity to shores making it more difficult for ships to weather storms.

The U.S. Weather Bureau failed to predict the intensity of the storm, and the process of preparing and communicating predictions was slow. These factors contributed to the storm's destructiveness. The contemporaneous weather forecasters did not have enough data, communications, analysis capability, and understanding of atmospheric dynamics to predict the storm. They could not predict wind directions, which is key to the ability of ships to avoid or cope with the effects of storms.