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DES MOINES, Iowa (AP) — Crop loss estimates from a rare wind storm that slammed Iowa in August have increased by more than 50%, a new report shows.

The U.S. Department of Agriculture said Friday that the number of crop acres that Iowa farmers are unable to harvest has grown to 850,000 (343,983 hectares) from estimates last month that 550,000 acres (222,577 hectares) were lost, The Des Moines Register reported.

Grain bins crushed in Tama County.
(Courtesy of Kip Ladage)

The storm, known as a derecho, generated winds of up to 140 mph (225 kph) that flattened crops. The damage then was compounded in late summer with a drought that, at its peak, encompassed much of the state. The drought is again expanding after some September rainfall.

Iowa Agriculture Secretary Mike Naig said he expects the number of lost acres will climb even more as growers move deeper into the harvest. Usually, farmers will try to harvest downed corn, salvaging what they can. But Naig said he said he has heard that many are asking crop insurance adjusters to take another look at their fields after finding it more difficult than expected.