Other cities that could see severe weather include Washington, DC and Baltimore, said CNN meteorologist Haley Brink, adding the main threats include isolated tornadoes and damaging winds.
Heavy rain will accompany Monday’s storms, especially across the Ohio River Valley, with the potential for rainfall rates of one to two inches per hour, she said. Flood watches have been issued for parts of Kentucky, Ohio, Indiana and West Virginia, and soil in the area is already saturated from heavy rain over the last two weeks.
Any additional rain will make ongoing river flooding worse, Brink said.
As these large sections of the country brace for the potential of more severe weather, recovery efforts remain ongoing in Iowa, where several tornadoes touched down near Des Moines on Saturday, killing seven people, including two children, and impacting dozens of homes.
Residents may have had less time to prepare and take shelter due to the delayed dissemination of tornado warnings issued by the local National Weather Service, including in Madison County, where Emergency Management Director Diogenes Ayala said six residents were killed.
The oldest victim was 72 years old and the youngest was aged 2, Ayala said at a news conference in Winterset on Sunday afternoon. He had earlier said there were two victims under 5.
A person in a rural area near the Lucas County city of Chariton was also killed, an official said.
The tornado in Winterset was raised to an EF-4 level — with maximum sustained winds of 170 mph — by the National Weather Service on Monday. It was on the ground for more than an hour and a half, and its path stretched almost 70 miles.
It was the first EF-4 tornado in Iowa since October 2013 and is the second-longest tornado path since 1980, behind only a 117-mile path on June 7, 1984, in southern Iowa.
Six people in Madison County were being treated for injuries sustained in the tornado, according to officials. Ayala previously said one adult had life-threatening injuries and three others had been hospitalized in serious condition.
“This is, I think, the worst anyone has seen in quite a long time,” Ayala said Sunday, telling reporters about 52 homes within a span of more than 13 miles were damaged or destroyed in Madison County.
A family was reported to be trapped in their storm shelter but were later able to be helped and are safe, according to the agency.
At least 2 EF3 tornadoes hit Iowa, NWS says
There were just under 40 reports of tornadoes over the weekend, according to CNN meteorologist Dave Hennen. Most were reported in Iowa on Saturday, though there were others in Arkansas, Missouri, Wisconsin and Indiana. In all, there were more than 200 reports of severe weather — including tornadoes, damaging winds and hail — in more than a dozen states, Hennen said.
“I can confirm that warning lead time averaged 20 minutes and some of the warnings were delayed in dissemination,” Susan Buchanan, a spokesperson for the NWS, told CNN on Monday morning. The delay was first detected by Daryl Herzmann, an Iowa State University systems analyst.
“The Des Moines forecast office was aware of the delay and took the precaution to issue warnings earlier than they normally would have under similar circumstances to compensate and ensure that warnings reached the public in a timely manner,” Buchanan’s statement read. “The cable outage caused that office to switch from its primary, land-based communication network to a backup satellite-based network that serves every NWS field office.”
The combination of an increase in messages and performance characteristics of the satellite network slowed the queue of message transmissions and created a backlog across multiple offices, Buchanan said.
“Our primary goal now is to immediately implement procedural changes to avoid a repeat,” Buchanan said.
After the severe weather passed through, many residents began the arduous process of recovering from the damage inflicted.
“You really realize who cares about you and just makes you feel special, you know you have all these people who are willing to help you,” she told KCCI.
Iowa Gov. Kim Reynolds issued a disaster proclamation for Madison County, allowing state resources to be used for response and recovery efforts, according to a news release. Additional counties may be added to the proclamation.
The Chariton tornado is also estimated to have been an EF3 with winds of 138 mph and was on the ground for more than 16 miles, according to preliminary NWS surveys.
Other tornadoes that touched down include an EF2 with estimated winds of 122 mph near Leon, which was on the ground for 19 miles, the NWS said.
An EF1 tornado with 110 mph winds occurred in Vinton, an EF1 with 100 mph winds struck in West Lake Park and an EF-0 tornado also impacted West Lake Park with 65 mph winds, according to the NWS.
The agency said it is still conducting damage surveys across the state and is working to determine how many tornadoes occurred.
CNN’s Joe Sutton, Andy Rose, Melissa Alonso, Jennifer Feldman, Allison Chinchar, Gene Norman, Hannah Sarisohn, Susannah Cullinane, Aya Elamroussi and Brandon Miller contributed to this report.