NWS surveying storm damage in Iowa
A swift line of tornadoes and thunderstorms severed tree limbs and power lines and tore off roofs as it marched across Iowa on Wednesday.
The National Weather Service is sending out damage survey teams Thursday to determine just how many actual tornadoes touched down in Iowa.
NWS meteorologist Kurt Kotenberg said the teams are working to confirm reported tornado damage, displayed on their local storm app. According to the map on the app, eight tornado touchdowns or tornado-related damage were reported.
That initial information can be drawn from social media photos, other storm teams and citizen reports, Kotenberg said.
Some damage on Des Moines' south side, including to Iowa National Guard facilities at the airport, was attributed to a funnel cloud on the ground.
The storms started in western Iowa and moved east. At about 2 p.m., an apparent tornado hit Corning, damaging three buildings in the industrial park on the west side of town, according to reports compiled by the NWS.
About 40 people were briefly evacuated from the industrial park in Corning after the storm caused an argon gas leak, said Adams County Emergency Manager Don Willett. No one was injured.
Emergency officials received multiple reports of semi-trucks being blown over in many regions of Iowa. A high wind warning for much of the state remains in effect through today.
By the time severe weather pushed out of the state, at about 7 p.m., meteorologists had issued 20 tornado warnings, and trained spotters confirmed several funnel clouds. Survey teams will confirm whether damage was caused by tornadoes or by strong straight-line winds.
Winterset High School and the county historical museum were reportedly damaged by a possible twister in Madison County. In Des Moines, windows were blown out of homes and a glass factory, the National Weather Service said. Southeast of Des Moines in Knoxville, emergency crews were called to Walmart at about 4 p.m. because of severe storm damage. A 911 dispatcher said that the store was evacuated, but that no one was injured.
Tornadoes are rare in November, according to a weather service report.
The last time multiple tornadoes were reported in November in Iowa was Nov. 12, 2005, when a string of storms rampaged through central Iowa.
Woodward and Stratford were hit hardest; a woman died in Stratford, the only person ever killed by an Iowa tornado in November. A tornado warning in Ames prompted the evacuation of Jack Trice Stadium hours before an Iowa State University football game.
A total of 12 tornadoes were confirmed that night. Before 2005, the last report of a November tornado in Iowa was one tornado on Nov. 29, 1991.