* WHAT. Heat index values up to 101 degrees. * WHERE. A portion of central Pennsylvania. * WHEN. Until 8 PM EDT Saturday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Dangerously hot conditions with heat index values up to 110 possible. * WHERE. Portions of central and southern Delaware, northeast Maryland, and southern New Jersey. * WHEN. From Sunday morning through Sunday evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. For the Heat Advisory, heat index values up to 99. For the Excessive Heat Watch, dangerously hot conditions with heat index values up to 106 possible. * WHERE. Portions of northern Delaware, New Jersey, and southeast Pennsylvania. * WHEN. For the Heat Advisory, until 6 AM EDT Saturday. For the Excessive Heat Watch, from Saturday morning through Sunday evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

The Pennsylvania Department of Environmental Protection has issued a Code ORANGE Air Quality Alert on Friday for the Susquehanna Valley. A Code ORANGE Air Quality Alert means that air pollution concentrations within the region may become unhealthy for sensitive groups. Sensitive groups include children, people suffering from asthma, heart disease or other lung diseases, and the elderly. The effects of air pollution can be minimized by avoiding strenuous activity or exercise outdoors. For more information on ground-level ozone and fine particles, visit http://www.airnow.gov and http://www.aqpartners.state.pa.us.

* WHAT. Dangerously hot conditions with heat index values up to 107 possible. * WHERE. Portions of central and southern Delaware, northeast Maryland, and southern New Jersey. * WHEN. From Sunday morning through Sunday evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. For the Heat Advisory, heat index values up to 99. For the Excessive Heat Watch, dangerously hot conditions with heat index values up to 105 possible. * WHERE. Portions of northern Delaware, central, northern, and southern New Jersey, and southeast Pennsylvania. * WHEN. For the Heat Advisory, until 6 AM EDT Saturday. For the Excessive Heat Watch, from Saturday morning through Sunday evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Heat index values up to 101. * WHERE. Central Pennsylvania. * WHEN. Until 8 PM EDT Saturday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.