Instructions: An excessive heat warning means that a prolonged period of extremely hot temperatures will occur. take extra precautions if you work or spend time outside. when possible...reschedule strenuous activities to early morning or evening. know the signs and symptoms of heat exhaustion and heat stroke. wear light weight and loose fitting clothing when possible and drink plenty of water. the occupational safety and health administration recommends these additional steps to reduce risk during outdoor work... schedule frequent rest breaks in shaded or air conditioned environments. anyone overcome by heat should be moved to a cool and shaded location. heat stroke is an emergency...call 911.