* WHAT...Dangerously hot conditions possible. Afternoon temperatures 108 to 115. Major Heat Risk.

* WHERE...A portion of south central Arizona.

* WHEN...From Tuesday morning through Thursday evening.

* IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.

* ADDITIONAL DETAILS...In Maricopa County, call 2-1-1 to find a free cooling center, transportation, water, and more. http://www.maricopa.gov/heat

AQAPSR The Arizona Department of Environmental Quality (ADEQ) has issued an Ozone High Pollution Advisory for the Phoenix Metro Area on Tuesday. This means that forecast weather conditions combined with existing ozone levels are expected to result in local maximum 8-hour ozone concentrations that pose a health risk. Adverse health effects increase as air quality deteriorates. Ozone is an air contaminant which can cause breathing difficulties for children, older adults, as well as persons with respiratory problems. A decrease in physical activity is recommended. You are urged to car pool, telecommute or use mass transit. The use of gasoline-powered equipment should be reduced or done late in the day. For details on this High Pollution Advisory, visit the ADEQ internet site at www.azdeq.gov/forecast/phoenix or call 602-771-2300.