Thousands of flights have been canceled or delayed in several US cities. because of the strong storms that hit the east, southeast and midwest of the country.

This emerged from data from FlightAware on Monday evening 6,196 flights within, to or from the US were delayed. and another 1,674 were cancelled.

The airports most affected by this situation are those of La Guardia, Newark, John F. Kennedy in the New York area; Hartsfield-Jackson, which serves Atlanta, and O’Hare Airport, in Chicago. The airlines that have had the most cancellations or delays are United Airlines, Republic and Endeavor Air.

The delays and cancellations come after thunderstorms swept through parts of Arkansas, Tennessee, Mississippi and the Ohio Valley on Sunday night, according to the National Weather Service’s (NWS) Storm Prediction Center. More than 700,000 people in the region are without power, details CNN.

Meanwhile, more than 50 million people from Arizona to Louisiana faced “oppressive” heat Sunday in a significant heat wave that is expected to last through the start of the July 4 holiday week. Experts say it could potentially break several high temperature records in the region.

The NWS indicates that the storms and rains will continue this Monday evening through Tuesday.

In addition, flooding is expected in the east of the country, as the weather front moves to the north of the country. While the Midwest will also be hit by heavy rains, which will last even until Wednesday.

So far, four fatalities have occurred due to weather conditions in the states of Arkansas, Indiana and Georgia.

In Ohio, the severe storms that spawned tornadoes caused some 400,000 homes and businesses to lose electricity due to the meteorological phenomena that keep the eastern part of the country on alert, from North Carolina to Pennsylvania, EFE reports.

More than 90 million people are on alert for severe weather this Monday. Cities like Philadelphia, Baltimore and Washington, DC are among the highest risk areas.