March 2026 Megastorm: Blizzard, Tornadoes, and Severe Weather Impact Millions

A powerful late-winter storm complex impacted a vast area of North America from March 13-17, 2026, bringing a combination of blizzard conditions, severe thunderstorms, and widespread disruptions to millions. The system, unofficially dubbed “Winter Storm Iona” by The Weather Channel, demonstrated the potential for significant late-season winter weather and severe outbreaks.

Storm Overview and Timeline

The storm system initially moved onshore in the Pacific Northwest on March 13, 2026, delivering heavy snowfall to mountainous regions. Strengthening as it moved northeastward, the system unleashed a variety of hazardous weather conditions across the central and eastern United States and portions of southern Canada. The most intense period of the storm was between March 15 and 17, 2026.

Blizzard Conditions in the Upper Midwest

A major blizzard impacted the Upper Midwest, with blizzard warnings issued for parts of Wisconsin, Michigan, Illinois, Iowa, Minnesota, and South Dakota. These conditions were characterized by sustained winds of at least 35 mph (56 km/h), reduced visibility, and heavy snowfall. Green Bay, Wisconsin, experienced its largest single-day snowfall since January 9, 1889, with 17.1 inches recorded on one day, making it the third-largest snowfall in a single day in the city’s history.

The heaviest snowfall accumulations ranged from 1 to 2 feet across southeastern Minnesota, central Wisconsin, and the Upper Peninsula of Michigan, with some locations exceeding 30 inches. Near Mount Arvon, Michigan, a record 39 inches of snow fell as of Tuesday morning, March 17, 2026. Even in areas with lower snowfall totals, such as Minneapolis, Minnesota (8.8 inches), strong winds created dangerous travel conditions.

Severe Weather Outbreak in the Lower Mississippi Valley and Southeast

Simultaneously with the blizzard, a severe weather outbreak brought damaging winds, large hail, and tornadoes to the Lower Mississippi Valley, the Southeastern United States, the Carolinas, and the Mid-Atlantic states. As of March 17, 2026, over 130 tornadoes had been confirmed across the U.S. Since March 5, 2026.

The tornado outbreak included an EF1 tornado in Caneyville, Kentucky, with winds reaching 110 mph on March 15, 2026. Large hail, up to 2.5 inches in diameter, was reported near Cushing, Texas, also on March 15, 2026. Straight-line winds near Minturn, Arkansas, reached 77 mph on the same day.

Impacts and Disruptions

The storm caused widespread disruptions, including:

• Power Outages: More than 500,000 power outages were reported across affected areas.
• Air Travel: Chicago O’Hare International Airport experienced 2,294 flight delays and 1,630 cancellations between Saturday, and Monday.
• Road Closures: Dangerous travel conditions led to numerous road closures and travel advisories.

Looking Ahead

The combination of existing snow cover and continued cold temperatures suggests that winter-like conditions may persist longer than usual in some areas, potentially extending into April or May. The March 2026 storm complex serves as a reminder of the potential for significant late-season winter weather and the importance of preparedness.