World·Video

5 dead after unusually strong storm system strikes U.S. Midwest

At least five people died as a powerful and extremely unusual storm system swept across the U.S. Great Plains and Midwest on Wednesday amid unseasonably warm temperatures, spawning hurricane-force winds and possible tornadoes in Nebraska, Iowa and Minnesota.

System came on heels of tornadoes last weekend that killed more than 85 people

Semi-truck flips from high winds in U.S.

12 months ago
Duration 0:33
Dramatic dashcam video captured the moment a semi-trailer lost control and was blown over on its side in hurricane-force wind gusts in Lincoln, Neb. 'Thankfully the driver was wearing a seat belt and was not injured,' Nebraska State Patrol said.

At least five people died as a powerful and extremely unusual storm system swept across the U.S. Great Plains and Midwest on Wednesday amid unseasonably warm temperatures, spawning hurricane-force winds and possible tornadoes in Nebraska, Iowa and Minnesota.

In southeastern Minnesota, Olmsted County Sheriff's Lt. Lee Rossman said a 65-year-old man was killed Wednesday night when a 40-foot tree blew onto him outside his home. In southwestern Kansas, blinding dust kicked up by the storms Wednesday led to two separate crashes that killed three people, according to Kansas Highway Patrol. And in eastern Iowa, a semitrailer was struck by high winds and rolled onto its side Wednesday evening, killing the driver, the Iowa State Patrol confirmed.

The storm shifted north of the Great Lakes into Canada on Thursday, with high winds, snow and hazardous conditions continuing in the upper Great Lakes region, the National Weather Service said. More than 400,000 homes and businesses were without electricity in Michigan, Wisconsin, Iowa and Kansas, according to poweroutage.us, which tracks utility reports.

A tornado was reported in southern Minnesota on Wednesday and, if confirmed, would be the state's first on record in December. The small community of Hartland, Minn., might have been the hardest hit, with a reported 35 to 40 homes sustaining minor damage and a few businesses severely damaged, county Emergency Management Director Rich Hall said.

Unprecedented warm weather

The destructive weather system developed amid unprecedented warmth for December in the Plains and northern states. That included temperatures that rose to 21 C across southwestern Wisconsin on Wednesday evening. The Weather Company historian Chris Burt compared the heat to that of a "warm July evening."

"I can say with some confidence that this event (the heat and tornadoes) is among the most (if not THE most) anomalous weather event ever on record for the Upper Midwest," Burt wrote in a Facebook post.

The winds knocked down trees, tree limbs and nearly 150 power lines in northern and western Michigan's Lower Peninsula. In the western Michigan village of Fruitport, high winds peeled back a portion of an elementary school's roof, leading officials to close all district schools Thursday.

Two semi-trucks lie on the sides of the I-25 highway near Colorado Springs, Colo., on Wednesday. More than a dozen semis were blown over by high winds on the highway. (Jerilee Bennett/The Gazette/The Associated Press)

There were more than 20 tornado reports Wednesday in the Plains states, scattered through eastern Nebraska and Iowa, based on preliminary reports to the Storm Prediction Center.

The day also saw the most reports of hurricane-force wind gusts — 120 km/h or higher — of any day since 2004, the Storm Prediction Center said.

"To have this number of damaging wind storms at one time would be unusual anytime of year," said Brian Barjenbruch, a meteorologist with the National Weather Service in Valley, Neb. "But to have this happen in December is really abnormal."

The governors of Kansas and Iowa declared states of emergency.

The system came on the heels of devastating tornadoes last weekend that cut a path through states including Arkansas, Missouri, Tennessee, Illinois and Kentucky, killing more than 85 people.

The strong winds also whipped up dust that reduced visibility to zero west of WaKeeney, Kan., the state Department of Transportation said, and caused at least four semi-trailers to blow over. Kansas officials closed Interstate 70 from the Colorado border to Salina, as well as all state highways in nine counties in northwest Kansas.

Kansas deployed helicopters and other firefighting equipment to help smother at least a dozen wind-fuelled wildfires in western and central counties, officials said Thursday.

That dust and smoke was carried north by the storm and concentrated over parts of Kansas, Nebraska and Iowa, causing a dramatic drop in air quality in those areas late Wednesday. That spawned a glut of calls to already-taxed emergency dispatchers from people reporting the smell of smoke.

A cloud of dust is seen in Niwot, Colo., on Wednesday in this screen grab from a social media video. (Kirk Fischer/Reuters)

All weather events 'augmented by climate change'

A wildfire prompted Sheridan County officials to evacuate a few homes near Quinter in northwest Kansas. Emergency management director Don Koerperich did not have an estimate of how big the fire was but said he was "glad it wasn't near any towns." Other fires were reported in Russell and Ellis counties.

Scientists say extreme weather events and warmer temperatures, much like what's happening, are more likely to occur with human-caused climate change. However, scientifically attributing a specific event like this storm system to global warming requires specific analysis and computer simulations that take time, haven't been done and sometimes show no clear connection.

WATCH | Climate experts struck by intensity of fatal U.S. tornadoes:

Experts awestruck by timing, magnitude of Midwest U.S. tornadoes

12 months ago
Duration 2:00
Climate experts have been left awestruck by the timing and magnitude of the devastating tornadoes that tore through swaths of the Midwest U.S. It’s rare for tornadoes to touch down in December, but experts say warmer weather conditions from a La Nina weather cycle is among the explanations.

"I think we also need to stop asking the question of whether or not this event was caused by climate change. All events nowadays are augmented by climate change," said Northern Illinois University meteorology professor Victor Gensini.

"We need to be asking, 'To what extent did climate change play a role and how likely was this event to occur in the absence of climate change?' "

The unusually warm temperatures on Wednesday were due in part to record-high ocean temperatures in the Gulf of Mexico, which wouldn't have happened without global warming, said Jeff Masters, a Yale Climate Connections meteorologist who cofounded Weather Underground.

A home outside Bayard, Iowa, is damaged following a band of intense weather that crossed the state on Wednesday. (Bryon Houlgrave/The Des Moines Register/The Associated Press)

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