Warren County will be under a heat advisory from 11 a.m. Thursday to 10 p.m. Saturday.The National Weather Service in St. Louis issued the heat advisory.People need to take precautions to keep themselves and others safe from heat related illness.Forecasters are expecting heat index values of 105 and higher during the late morning through early evening from Thursday through Saturday. Heat index values up to 107 are expected due to temperatures in the upper 90s and dewpoints in the lower 70s.The combination of hot temperatures and high humidity will likely lead to an increased risk of heat-related stress and illness such as dehydration, heat cramps, heat exhaustion or heat stroke, which can be deadly.The very young, the elderly, those without air conditioning and those participating in strenuous outdoor activities are most susceptible.Also, car interiors can reach lethal temperatures for humans and animals in a matter of minutes.People should avoid poorly ventilated areas and prolonged work in the sun. They should have hydrating liquids available, and try to stay in air-conditioned environments.To reduce risk during outdoor work, the occupational safety and health administration recommends scheduling frequent rest breaks in shaded or air conditioned environments.Anyone overcome by heat should be moved to a cool and shaded location.The Centers for Disease Control and Prevention identify symptoms of heat stroke as a body temperature of 103 degrees or higher; hot, red, dry or damp skin; a fast, strong pulse, dizziness, nausea, confusion or fainting. Heat stroke is an emergency, call 911.Heat advisory