Summary (tl;dr)

A powerful late-season winter storm, named Iona, is bringing widespread blizzard warnings, heavy snowfall, and strong winds to the Upper Midwest, leading to significant travel disruptions and emergency declarations.

Essential Background

After experiencing unseasonably warm temperatures earlier in March, the Midwest is now facing a dramatic shift in weather. An arctic air mass from Canada has collided with a strong Pacific jet stream, rapidly developing a powerful low-pressure system over the northern High Plains. This atmospheric interaction has created the conditions for a severe winter storm, intensifying into what forecasters are calling Winter Storm Iona.

The Full Story

Winter Storm Iona is currently sweeping across the northern central United States, prompting blizzard warnings for extensive areas of South Dakota, Minnesota, and Wisconsin, effective from Saturday evening through Sunday, March 14-15, 2026. Forecasters anticipate 10 to 30 inches of snow across the affected region, with some localized areas potentially receiving up to 40 inches. Wind gusts are expected to reach 50 to 60 mph, creating dangerous whiteout conditions and making travel extremely difficult or impossible.

In anticipation of the severe weather, Delta Air Lines and other carriers have proactively canceled hundreds of flights, primarily impacting operations at Minneapolis-St. Paul International Airport (MSP) and over 20 other regional airports. Minnesota Governor Tim Walz has declared a peacetime emergency and authorized the deployment of the Minnesota National Guard to assist with storm-related needs. The storm is expected to further strengthen as it tracks eastward through the Great Lakes region into Monday.

Why It Matters

The intense blizzard conditions pose significant risks to public safety, including hazardous travel that could strand motorists and the potential for widespread power outages due to heavy, wet snow and strong winds. The extensive flight cancellations are causing major disruptions for thousands of travelers across the Midwest and beyond. The declaration of a peacetime emergency and the activation of the National Guard highlight the severity of the situation, urging residents to prioritize safety, heed warnings to avoid unnecessary travel, and allow emergency services to respond effectively.

Geographic Location

• Minneapolis, Hennepin County, Minnesota, United States (heavy snow, blizzard conditions, flight cancellations at Minneapolis-St. Paul International Airport)
• St. Paul, Ramsey County, Minnesota, United States (heavy snow, blizzard conditions)
• Aberdeen, Brown County, South Dakota, United States (blizzard warning, heavy snow, strong winds)
• Portage County, Wisconsin, United States (blizzard warning, dangerous travel conditions)
• Waushara County, Wisconsin, United States (blizzard warning, dangerous travel conditions)
• Wood County, Wisconsin, United States (blizzard warning, dangerous travel conditions)
• Waupaca County, Wisconsin, United States (blizzard warning, dangerous travel conditions)
• Marquette, Marquette County, Michigan, United States (blizzard conditions, heavy snowfall, high winds)
• Steele County, Minnesota, United States (requested National Guard assistance)
• Upper Midwest, United States (regional impact of Winter Storm Iona, widespread moderate to extreme winter weather impacts)
• Great Lakes, United States (regional impact of Winter Storm Iona)