VAN BUREN COUNTY, Iowa (KCRG-TV9) — The National Weather Service completed a damage survey for the July 19 tornado event in the southeastern part of Van Buren County.
They said two brief EF-1 tornadoes touched down north of Keosauqua, causing damage to crops, trees, farm outbuildings and equipment.
The first tornado started at 6:07 p.m. and reached an estimated peak wind speed of 100 mph. The path of the tornado was over 2 miles in length, with a maximum width of 50 yards.
It tracked through a corn field and destroyed a large historic stone barn before ending at 6:15 p.m.
The second tornado started at 6:09 p.m. and reached an estimated peak wind speed of 110 mph. The path of the tornado was 0.19 miles in length, with a maximum width of 75 yards.
It destroyed crops, farm equipment and several large farm outbuildings before ending at 6:11 p.m.
The EF (Enhanced Fujita) scale classifies tornadoes based on the damage they cause:
– EF0 – weak (65-85 mph)
– EF1 – weak (86-110 mph)
– EF2 – strong (11-135 mph)
– EF3 – strong (136-165 mph)
– EF4 – violent (166-200 mph)
– EF5 – violent (>200 mph)
by KCRG-TV9 News Staff (2018, July 20)