REGIONAL — A four-day heatwave starting Tuesday is going to affect Essex County, according to The National Weather Service.

The heat indices, a measure that combines humidity and air temperature, will make it feel much hotter outside, while the temperature could reach digits high enough to break century-old records. 

The weather service tweeted on Monday that heat and humidity are expected to peak on Wednesday through Friday. 

“Afternoon heat indices will reach between 98 and 106 degrees away from the south coast,” the weather service’s tweet read.

In preparation for the high temperatures, City of Lynn shared a heat advisory for Tuesday and Thursday, when the temperature is expected to reach its peak. City Hall Auditorium will serve as a cooling station, from 8:30 a.m. to 8:00 p.m. on Tuesday and from 8:30 a.m. to 4 p.m. on Thursday to help residents stay cool and safe. Splash pads are available at Kiley Park, Neptune Boulevard Park, Barry Park and Flax Pond Park.

The Lynnfield Library will be serving as a cooling station from Monday to Thursday from 9 a.m. to 9 p.m. and Friday to Saturday from 9 a.m. to 5 p.m. The library will be closed on Wednesday for Juneteenth.

Swampscott Public Library will be serving as a cooling station on Tuesday from 9 a.m. to 8:30 p.m., on Thursday from 1:30 p.m. to 8:30 p.m. and on Friday from 9 a.m. to 5 p.m. The Senior Center will be serving as a cooling station from Tuesday to Thursday from 8:30 a.m. to 4 p.m. and on Friday from 8:30 a.m. to 3 p.m. The Police Station will be open to the residents on Wednesday from 10 a.m. to 4 p.m. Swampscott Library and Fire Department have air conditioners to lend out.

Marblehead’s answer to the upcoming heatwave is Crocker Park. 

While you might be looking for another alternative to cool down during the four-day wave, relying on Lynn’s Kings beach or Saugus’ Pearce Lake is not an option as they are currently closed due to bacterial exceedance. Swimming in unsafe waters with high bacteria levels, may result in illnesses with the following characteristics:

gastrointestinal symptoms, respiratory symptoms, dermatological,  eye and ear symptoms and flu-like symptoms. 

This week’s heat will be especially dangerous for older residents, children and people who work outside. Walking your dog during the heatwave is also not advised. 

“Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors,” the weather service advised.