On July 18, 2019 the Maryland Department of Health sent out a press release alerting residents to follow safety tips and take precautions to avoid heat-related illness amid excessive heat.
Please see the press release here: https://bit.ly/2XQtV4p
As of July 19, 2019 no official cooling centers have been opened however the Washington County Health Department has gathered a list of places and organizations who are providing refuge from the heat. Disclaimer: Hours and/or locations subject to change.