The District is in the midst of the second heat wave of the season, and it’s a doozy. On Thursday, the temperature reached 90 degrees with a heat index of 95 degrees, and the mayor’s office activated D.C.’s heat emergency plan.

Here’s a refresher on what that means: for one, the city enacts more than 70 cooling centers for people to come seek relief from the heat. These centers are government facilities, homeless shelters, and day centers throughout the city. (Here’s an interactive map to help you find one nearby, if needed.) The centers are open until 6 p.m. “or until it has been deemed safe to go outdoors.”

If you’re unable to get to a cooling center yourself, you can call for transportation to one at the hyperthermia hotline: (202) 399-7093. Also call that number if you see a person in heat-related distress. The District’s low barrier shelters will be open all day on Thursday due to the heat.

Officials also recommend that you use any public library or recreation center during the daytime hours for some respite from the sun and humidity.

This latest heat wave (the first one since the start of actual summer) began on Tuesday and Wednesday, which hit 90 and 91 degrees respectively, according to the Capital Weather Gang. It’s going to get hotter tomorrow and Saturday, when we’ll reaching the mid or even upper 90s, according to the outlet. The wave could last until Sunday or even Monday.