This is the county policy on heat for Outdoor Recreation Programs
Baltimore County Parks and Recreation Policy:
Q. How does lightning and thunder affect outdoor activities?
A. Upon the first sound of thunder or sighting of lightning all in attendance at the outdoor activity should immediately go to their cars or enter a building. No one will be allowed to resume play until 30 minutes after the last sound of thunder and/or the last sighting of lightning. Recreation staff has complete authority to enforce this policy at a Baltimore County facility. In the absence of recreation staff, volunteer coaches and officials must follow this policy.