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Tornadoes touched down Monday evening in rural Oklahoma and large hail pelted parts of Kansas as an outbreak of dangerous storms brought the possibility of strong twisters staying on the ground for many miles.

Forecasters have issued a rare high-risk weather warning for the two states, the first for Oklahoma in five years.

“You can’t rely on waiting to see tornadoes before sheltering tonight,” the National Weather Service said.

Oklahoma was under a Particularly Dangerous Situation (PDS) watch, the second in just nine days. The PDS watch in the state last month resulted four deaths and 22 confirmed tornadoes.

At least four tornadoes had been spotted in north central Oklahoma, including one about a 45-minute drive north of Tulsa. The National Weather Service office there issued a tornado emergency alert Monday night for the nearby towns of Bartlesville, Dewey and Barnsdall.

The Weather Service warned “a large and life-threatening tornado” was headed toward those towns, with wind gusts up to 70 mph.

Other tornadoes had been spotted earlier in the evening near the 1,000-person town of Okeene, while another storm in Covington had “produced tornadoes off and on for over an hour.”

The greatest risk of damaging weather includes areas in Oklahoma, such as Sulphur and Holdenville, still recovering from a tornado that killed four and left thousands without power late last month. Both the Plains and Midwest have been hammered by tornadoes this spring.

A dispatcher for Kingfisher County, Oklahoma, said there was a report of tornado damage to a single home, but it wasn’t immediately known if anyone was in the home or if anyone was hurt. Throughout the area, wind farm turbines spun rapidly in the wind and blinding rain.

Meanwhile, apple-sized hail of 3 inches in diameter was reported near Ellinwood, Kansas, a town of about 2,000 residents 100 miles northwest of Wichita.

The Weather Service said that more than 3.4 million people, 1,614 schools and 159 hospitals in Oklahoma, portions of southern Kansas and far north Texas, face the most severe threat for tornadoes.

Schools and colleges across the state, including the University of Oklahoma, Oklahoma City Public Schools and several metro-area school districts, shut down early and canceled late afternoon and evening classes and activities.

Oklahoma’s State Emergency Operations Center, which coordinates storm response from a bunker near the state Capitol, remains activated from last weekend’s deadly storms, and the state’s commissioner of public safety told state agencies to let most of their workers across Oklahoma leave early on Monday.

Monte Tucker, a farmer and rancher in the far western Oklahoma town of Sweetwater, spent Monday putting some of his tractors and heavy equipment in barns to protect it from hail and letting his neighbors know they can come to his house if the weather becomes dangerous.

“We built a house 10 years ago, and my stubborn wife put her foot down and made sure we built a safe room,” Tucker said. He said the entire ground-level room is built with reinforced concrete walls.

Bill Bunting, deputy director of the Storm Prediction Center, said a high risk from the center is not something seen every day or every spring.

“It’s the highest level of threat we can assign. And it’s a day to take very, very seriously,” he said.

The last time a high risk was issued was March 31, 2023, when a massive storm system tore through parts of the South and Midwest including Arkansas, Illinois and rural Indiana.

The risk on Monday in parts of the southern Plains is the worst in five years, AccuWeather Chief Meteorologist Jon Porter said.

“If you look at a meteorology textbook about how to get a significant tornado outbreak in the southern Plains, all the ingredients you need are here today,” Porter said.

The number of storms and their intensity should increase quickly in the evening hours across western parts of Oklahoma and up into south-central Kansas, Bunting said.

“The kinds of tornadoes that this storm can produce are particularly intense, and they can be long-lasting,” Porter said. “These are the tornadoes that sometimes can last for 45 minutes or an hour, even more, creating paths of destruction as they move along.”

The high risk is due to an unusual confluence: Winds gusting up to around 75 mph have been blasting through Colorado’s populated Front Range region, including the Denver area, on Monday.

The winds are being created by a low pressure system north of Colorado that is also pulling up moisture from the Gulf of Mexico, fueling the risk of severe weather on the Plains, said Greg Heavener, warning coordination meteorologist at the National Weather Service’s Denver-area office.

Colorado is not at risk of tornadoes or thunderstorms, he said.

The dangerous Plains weather will move east, potentially creating overnight risk in places like Kansas City and Springfield in Missouri through early Tuesday, Porter said.

“This is not going to be a atmospheric setup where the sun is going to go down and the thunderstorms are going to wane and there’s going to be no additional risk,” noted Northern Illinois University meteorology professor Victor Gensini.

The entire week is looking stormy across the U.S. The eastern U.S. and the South are expected to get the brunt of the bad weather through the rest of the week, including in Indianapolis, Memphis, Nashville, St. Louis and Cincinnati, where more than 21 million people live. It should be clear over the weekend.

Meanwhile, floodwaters in the Houston area began receding Monday after days of heavy rain in southeastern Texas left neighborhoods flooded and led to hundreds of high-water rescues.