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 region in the Midwestern United States and Southwestern Ontario, Canada, between November 7 and 10, 1913. The storm was at its most powerful on November 9, battering and overturning ships on four of the five Great Lakes, particularly Lake Huron.
With more than 250 people killed, the storm was the deadliest and most destructive natural disaster to hit the Great Lakes in recorded history. Shipping was hard hit; 19 ships were destroyed, and 19 others were stranded. About 68,300 tons of cargo—including coal, iron ore, and grain—were lost. Damages were estimated at nearly $4.8 million ($162 million in 2026). The storm impacted many cities, including Duluth, Minnesota; Chicago, Illinois; and Cleveland, Ohio. Cleveland 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 fueled by the Great 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 lakes for extended periods, creating very large waves. The large size of the 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 lakes.
The United States Weather Bureau, precursor to the National Weather Service, 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.
The water in the five Great Lakes holds heat that allows them to remain relatively warm late into the year and postpones the cooling and first frosts in the region. During the autumn, two major weather tracks converge over the area. Cold, dry air moves south and southeast from northern Canada as an Alberta clipper, while warm, moist air moves north and northeast from the Gulf of Mexico along the lee of the central Rocky Mountains as a Colorado low. The collision of these air masses forms large storm systems in the middle of the North American continent, including the Great Lakes. When the cold air from these storms moves over the lakes, it is warmed by the waters below and picks up a spin. As the cyclonic system continues over the lakes, its power is intensified by the jet stream above and the warm waters below.
The resulting storm, which is commonly called a "November gale" or "November witch", can maintain hurricane-force winds, produce waves over 50 feet (15 m) high and dump significant falls of rain or snow. Fueled by the warm waters, these powerful storms may remain over the Great Lakes for days. November gales have caused several large storms over the Great Lakes, with at least 25 killer storms affecting the region since 1847. During the Mataafa Storm in 1905, 27 wooden vessels were lost. During a November gale in 1975, the giant bulk carrier SS Edmund Fitzgerald sank suddenly without sending a distress signal and with all crew still on board. The large size of the lakes provides fetches of hundreds of miles allowing huge waves to be developed. Their large unobstructed spaces result in wind speeds higher than nearby inland areas. Rogue waves (including a phenomenon named the "Three Sisters") are known to occur on the Great Lakes, including waves reinforced by reflections from the vertical shores of some of the lakes. Waves on the 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.
At the time of the storm, the United States Weather Bureau did not have enough data, communications, analysis capability and understanding of atmospheric dynamics to predict or understand the storm. They also were unable to predict wind directions to allow ships to avoid or cope with the storm's conditions. More modern studies of the available information and data from the storm provide better descriptions of its weather mechanisms and treat it as two storms.
Weather forecasters of the time did not have enough data or understanding of atmospheric dynamics to predict or comprehend the events of Sunday November 9. Frontal mechanisms, which were then referred to as "squall lines", were not yet understood. Surface observations were only collected twice daily at stations around the country; by the time these data were collected and maps were hand-drawn, the information was no longer representative of the actual weather conditions.
The Great Lakes Storm of 1913 was first noticed on Thursday, November 6 on the western side of Lake Superior, moving rapidly toward northern Lake Michigan. The weather forecast in The Detroit News predicted "moderate to brisk" winds at the Great Lakes with occasional rain on Thursday night or Friday for the upper lakes (except southern Lake Huron) and fair-to-unsettled conditions for the lower lakes. Around midnight on November 6–7, the steamer Cornell, which was 50 miles (80 km) west of Whitefish Point in Lake Superior, ran into a sudden northerly gale and was severely damaged. This gale lasted until late November 10 and almost forced Cornell ashore.
By November 7, a string of low-pressure centers in Canada had consolidated into a low-pressure center southwest of Lake Superior which became "Storm #1". At the same time, warm air pushed into the central Great Lakes from the south. By November 8, this storm was moving east through northern Lake Huron while strong northerly winds developed behind it over Lake Superior. By November 9, "Storm #2" had formed over the Carolinas and Virginia. The northern portion of this storm began sweeping warm moist Atlantic air over colder air in the Ohio area producing heavy snows. The northwest portion of this extremely powerful storm began creating strong winds from the north along the long axis of Lake Huron, building large waves. By November 10, 24 hours of such building had created immense waves which ships were subjected to along with the high winds as the center of the storm crossed north/northwest over Lake Erie toward Toronto. Surface pressures went as low as 968.5 hectopascals (millibars), the lowest of the storm.
Winds exceeding hurricane-force occurred over four of the Great Lakes for extended periods. Wave heights observed during the storm were estimated by observation rather than measurement; observations of regular waves exceeding 35 ft (11 m) were corroborated by modern-day simulations which estimate these at 38 ft (12 m). Interaction between waves (such as those reflected from vertical shorelines) can nearly double wave heights; observations of such waves during the storm estimated some as high as 50 ft (15 m).
On Friday, the weather forecast in the Port Huron, Michigan, Times-Herald described the storm as "moderately severe". The forecast predicted increased winds and falling temperatures over the next 24 hours. At 10:00 a.m., United States Coast Guard stations and all 112 Weather Bureau signal stations on the Great Lakes received a directive to hoist a square, red signal flag with a black center and a red, triangular maritime pennant below it, indicating a storm with winds of 55 mph (89 km/h) that would blow from the southwest. After dark, a red lantern over a white one was displayed to warn of storm winds from the west. The winds on Lake Superior had already reached 60 mph (97 km/h), with gusts to 80 mph (130 km/h), and an accompanying blizzard was moving toward Lake Huron. Sustained wind speeds reached 62 mph (100 km/h) and gusts to 68 mph (109 km/h) at Duluth.