At least 13 people have died so far because of heat-related illnesses in Maryland during this year’s “heat season,” up from this time last year, according to a report sent to The Baltimore Sun from the Maryland Department of Health.

Much of the U.S. is under extreme heat warnings or advisories while New York, Philadelphia and Washington could feel like 100 degrees or more.

Dangerous heat continues across the U.S. as millions see feels-like temperature reaching into the 90s and 100s from the Southeast to the Midwest.

Sunday, Monday and Tuesday are First Alert 6 Weather Days for heat index values up to 110°-115°! Stay hydrated, get out early or in the evening and try to avoid too much time outdoors during the peak afternoon heat. The full details can be found here! Mugginess sticks around the mid 90s will feel even hotter Sunday-Tuesday.

Heat advisories were in effect for a large portion of the East Coast from central Florida to Virginia through much of the weekend.

Plan on the heat building quickly Saturday, with highs in the upper 80s and low 90s. We will have another chance for some pop-up showers and storms in the afternoon and evening, especially for areas west.