* WHAT. Dangerously hot conditions with heat index values up to 106 expected. * WHERE. Portions of south central, southwest, and western Maine and central, northern, and southern New Hampshire. * WHEN. From 11 AM to 7 PM EDT Thursday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Dangerously hot conditions with heat index values up to 108 expected. * WHERE. In Maine, Coastal Waldo, Interior Waldo, Knox, Lincoln, Sagadahoc, Coastal Cumberland, and Coastal York Counties. In New Hampshire, Coastal Rockingham County. * WHEN. From 11 AM to 7 PM EDT Thursday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Heat index values up to 100 expected. * WHERE. Sullivan, Northern Grafton, Southern Coos, Southern Grafton, and Cheshire Counties. * WHEN. From 11 AM to 7 PM EDT Thursday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 100. * WHERE. In Connecticut, Hartford CT, Tolland CT, and Windham CT Counties. In Massachusetts, Eastern Hampden MA, Eastern Hampshire MA, Western Hampden MA, and Western Hampshire MA Counties. * WHEN. Until 7 PM EDT Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 101. * WHERE. Portions of central, eastern, northeastern, southeastern, and western Massachusetts and northern Rhode Island. * WHEN. Until 7 PM EDT Thursday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 102. * WHERE. Portions of central, eastern, northeastern, southeastern, and western Massachusetts and northern Rhode Island. * WHEN. Until 7 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 102. * WHERE. In Connecticut, Hartford CT, Tolland CT, and Windham CT Counties. In Massachusetts, Eastern Hampden MA, Eastern Hampshire MA, Western Hampden MA, and Western Hampshire MA Counties. * WHEN. Until 7 PM EDT Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Dangerously hot conditions with heat index values up to 105 expected. * WHERE. Portions of south central, southwest, and western Maine and central, northern, and southern New Hampshire. * WHEN. From 11 AM this morning to 7 PM EDT this evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Heat index values up to 100 expected. * WHERE. In Maine, Southern Somerset and Southern Franklin Counties. In New Hampshire, Sullivan, Northern Carroll, Northern Grafton, Southern Coos, Southern Grafton, and Cheshire Counties. * WHEN. From 11 AM this morning to 7 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

The Rhode Island Department of Environmental Management has issued an Air Quality Action Day for Ground Level Ozone, from 11 AM to 11 PM EDT Thursday. 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 Rhode Island Department of Environmental Management website at: https://dem.ri.gov/

The Massachusetts Department of Environmental Protection has issued an Air Quality Alert for Ground Level Ozone, from 11 AM to 11 PM EDT Thursday. An Air Quality Alert means that Ground Level Ozone concentrations within the region may approach or exceed levels that are Unhealthy for Sensitive Groups. Air is unhealthy for sensitive children and adults, such as those with asthma, lung or heart disease, and older adults. Sensitive children and adults should limit prolonged outdoor activity. For additional information, please visit the Massachusetts Department of Environmental Protection website at: https://mass.gov/orgs/massachusetts-department-of-environmental- protection