One person was killed when a large wedge tornado struck Windsor, Colorado, and two more deaths were reported in Pratt County, Kansas.

[3] Numerous tornadoes were reported across northern Kansas; however, damage was limited due to the sparsely populated areas it affected.

Most tornadoes were caught on tape by a helicopter reporter for KWTV-TV in Oklahoma City which was also repeatedly broadcast on CNN.

[19] Meanwhile, only isolated strong thunderstorms across southern and eastern Ontario during the evening hours while very limited activity across the Great Lakes and Ohio Valley regions.

The tornado moved along an unusual northwestward path, causing extensive damage to crops, outbuildings, and irrigation systems in this rural area.

[22][23] The tornado then passed east of Milliken, causing additional property damage before it struck the Missile Silo Park Campground west of Greeley, where one man was killed in his motor home.

[22][23] The large wedge tornado then struck the town of Windsor directly, damaging hundreds of homes and several businesses at EF2 to EF3 strength.

The most intense damage occurred in the eastern part of town, where some homes lost roofs and exterior walls, and trees sustained extensive denuding and some debarking.

The Windmill Daycare Center sustained a direct hit, where about 150 children were located but none were injured as they took cover from the storm, which blew out most of the building's windows and removed a large section of its roof.

A large tornado developed shortly after, touching down two miles south of Aplington in Grundy County at 4:48 pm CDT.

East of Aplington, the tornado traveled through a series of farm fields, leaving distinct cycloidal marks in the corn stubble.

[29] It then tracked toward Parkersburg, becoming violent, intensifying to EF5 strength, and growing into a large wedge-shaped tornado as it tore through the southern part of the community just before 5:00 pm CDT.

Numerous homes and businesses, two banks, and a high school were destroyed as the south side of Parkersburg was essentially flattened.

[30][31] Residential areas in Parkersburg were devastated by the tornado, as whole neighborhoods were leveled and entire rows of homes were swept away, leaving only basements behind in some cases.

[29] A rebar support set into the foundation of one home was found snapped in half, hardwood trees throughout southern Parkersburg were completely debarked and denuded, and shrubs were uprooted and stripped in some areas as well.

[32] The tornado maintained EF5 strength as it reached New Hartford, impacting a housing development on the northern side of the town at 5:09 pm CDT.

Multiple well-built homes with anchor bolts were again completely swept away, and vehicles were thrown long distances and mangled beyond recognition, a few of which only had their frames left.

[30] Past New Hartford, the tornado weakened dramatically and passed just north of Waterloo and Cedar Falls, shrinking to about 1⁄4 mile (400 m) in width as it continued to impact rural areas.

[29][32] As the tornado approached Dunkerton, it turned to the east-northeast, missing the town and growing up to 1.2 miles (1.9 km) wide.

Mud and corn stubble was picked up from farm fields near Dunkerton and plastered thickly against fences, power poles, and houses.

While initially rated high-end EF4, a final assessment determined that the tornado was an EF5 with estimated peak winds of about 205 miles per hour (330 km/h).

[36] After the tornado, Governor Chet Culver declared Butler and Black Hawk counties disaster areas due to the extensive storm damage.

[39] Heavy rains fell throughout much of the weekend across southern Alberta with local areas reporting as much as 8 inches (200 mm) according to the Weather Network.