A dome of heat extending from the Midwest to the East Coast has brought dangerously high temperatures, oppressive humidity and potentially severe storms this weekend, according to the National Weather Service. It urged the public to limit sun exposure, drink water and seek cooling centers.

To show just how stifling it will be, the Omaha office of the Weather Service placed a baking tray of biscuits on a car’s dashboard on Thursday.

“Biscuits are starting to get a slightly golden tinge to them,” the meteorologists said in a Twitter post. “And after nearly 8 hours in the sun, the outside of the biscuit is actually edible. The middle is still pretty doughy though. The max temp on the pan was 185!”

Heat indexes — a measure of temperature and relative humidity — in the New York City area are expected reach 100 to 115 degrees on Saturday and Sunday.