Historic Derecho Threatens Northern Plains and Upper Midwest

Residents of South Dakota and Minnesota are bracing for a significant derecho—a widespread, long-lived windstorm associated with a fast-moving group of severe thunderstorms—forecasted to impact the Northern Plains and Upper Midwest regions on Monday, July 28, 2025. The National Weather Service's Storm Prediction Center has issued a Level 4 out of 5 risk for severe weather, anticipating wind gusts exceeding 75 mph, with potential for severe hail, heavy rainfall, and embedded tornadoes.

A derecho is characterized by a long path of intense wind damage. To be classified as a derecho, a storm must cover at least 240 miles and produce wind gusts of 58 mph or greater. These storms are uncommon, usually occurring only a few times per summer in the central and southern U.S., driven by contrasts between hot, humid air in the south and cooler air in the north.

The Northern Plains and Upper Midwest have experienced several significant derechos in recent history. On May 12, 2022, a derecho affected parts of Nebraska, South Dakota, and Minnesota. Wind speeds exceeded 100 mph, and the storm produced 34 tornadoes, with 19 in South Dakota alone. The city of Castlewood, South Dakota, was notably impacted by an EF2 tornado that significantly damaged the elementary school and other structures. The event was declared a billion-dollar disaster in the U.S.

Derechos can cause damage comparable to tornadoes and hurricanes, including widespread destruction, flash floods, and power outages. Residents in the affected areas are advised to stay updated with forecasts and have access to sturdy shelter, as conditions can deteriorate rapidly. Safety measures include staying indoors, preferably in basements or interior rooms away from windows, heeding all official warnings, keeping devices charged, and ensuring access to weather updates via backup sources like radios if power or cell signal fails.

The forecasted derecho poses significant risks to communities in South Dakota and Minnesota. Potential impacts include:

• Infrastructure Damage: High winds can damage homes, businesses, and public facilities, leading to costly repairs and economic strain.

• Agricultural Losses: The region's farming communities may face crop damage, affecting local economies and food supply chains.

• Power Outages: Widespread outages can disrupt daily life, hinder emergency responses, and pose health risks, especially during extreme weather conditions.

• Public Safety: The potential for embedded tornadoes and severe hail increases the risk of injuries and fatalities.

As the region prepares for the impending storm, residents are urged to take all necessary precautions to ensure their safety and minimize potential damage.