The duration of the heat wave will make it particularly dangerous due to the cumulative effects of exposure to the heat. Elderly and young children are especially susceptible to the effects of the heat and should take extra precautions. People without power due to recent severe thunderstorms will also be greatly impacted.

Coupling the dangerous weather will be poor air quality resulting from smoke from the western fires, stagnant air masses and elevated ozone levels.

An excessive heat warning means a prolonged period of dangerously hot temperatures will occur. The combination of hot temperatures and high humidity will combine to create a dangerous situation in which heat illnesses are likely. People should drink lots of fluids, stay in an air-conditioned environment, stay out of the sun and check on relatives and neighbors often.

Those who work outside should take extra precautions by rescheduling strenuous activities to early morning or evening hours. Wear light weight and loose fitting clothing when possible and drink plenty of water.

Also, know the signs and symptoms of heat exhaustion and heat stroke.

To reduce the 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. Heat stroke is an emergency and 911 should be called.