From NWS
1966: A strong storm system produced a significant late season tornado outbreak across Iowa, Missouri, and Illinois even as cold air rushing in behind the system dropped 4.0 inches of snow at Sioux City. The strongest tornado struck the town of Belmond in Wright County at about 2 pm, producing F4 or F5 damage with 75 percent of businesses and more than 100 homes leveled. There were 6 fatalities and 172 injuries in and around Belmond, but the toll would likely have been far worse if the tornado had struck half an hour earlier during the homecoming parade when hundreds of people filled the streets. Elsewhere weaker tornadoes tracked across central and northeastern Iowa, with one moving from just east of Prairie City to south of Colfax and another moving from Clive through Urbandale, Johnston, Saylorville, and Ankeny fortunately producing only minor damage with no deaths or injuries.

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