Make sure to use sunscreen today, Maryland.

Temperatures will soar into the triple digits on Wednesday as a hot air mass settles over the region. The National Weather Service issued a heat advisory for much of Central Maryland, including Baltimore City, Anne Arundel, Baltimore, Howard, Harford, Montgomery and Prince George’s counties.

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Baltimore City could see temperatures as high as 103. The forecast for the Washington, D.C., region is a high of 99. There could be record-breaking highs in the area, said Jeremy Geiger, a meteorologist for the weather service’s Baltimore/Washington office.

The heat advisory goes into effect from 11 a.m. to 8 p.m., with heat index values expected to reach 105.

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Amtrak travelers may also experience delays starting Wednesday through Friday between 11 a.m. and 7 p.m., as trains will operate at reduced speed because of the heat.

Baltimore region

Baltimore City’s health commissioner issued a Code Red extreme heat declaration through Thursday and opened cooling centers across the city. Senior centers will also be operating as places where people can escape the heat.

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Capital region

Cooling centers in Prince George’s County are available whenever temperatures reach 90 or higher. The county has a map of where residents can go to cool down, with some centers in Berwyn Heights, Bowie, Landover, Hyattsville and Fort Washington.

Montgomery County officials also urged residents to take precautions, including drinking fluids, staying indoors if possible, and checking on relatives and neighbors.

Wildfire smoke

Smoke from Canadian wildfires is also spreading across the East Coast, including in Maryland. The weather service issued an air quality alert for Anne Arundel and Baltimore counties on Wednesday due to concentrated air pollution, which could become unhealthy for certain groups.

Children, the elderly and people with asthma, heart and lung diseases should avoid exercising outdoors and any strenuous activity.