* WHAT. Heat index values up to 98 expected. * WHERE. Portions of south central, southwest, and western Maine and central, northern, and southern New Hampshire. * WHEN. From noon today to 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 100. * WHERE. In Connecticut, Northern Middlesex, Northern New Haven, Northern New London, Southern Middlesex, and Southern New Haven Counties. In New York, Northeast Suffolk, Southern Nassau, and Southwest Suffolk Counties. * WHEN. Until 9 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 100. * WHERE. In Massachusetts, Southern Bristol MA and Southern Plymouth MA Counties. In Rhode Island, Newport RI and Washington RI Counties. * WHEN. Until 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 101. * WHERE. Portions of northern Connecticut, central, eastern, northeastern, southeastern, and western Massachusetts, and northern Rhode Island. * WHEN. Until 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

The Connecticut Department of Environmental Protection has issued an Air Quality Action Day for Ground Level Ozone, from 11 AM to 11 PM EDT Tuesday. An Air Quality Action day means that Ground Level Ozone concentrations within the region may approach or exceed unhealthy standards. For additional information, please visit the Connecticut Department of Energy and Environmental Protection website at: https://portal.ct.gov/deep