* WHAT. Heat index values up to 95 to 100. * WHERE. Northern Fairfield and Northern New Haven Counties. * WHEN. Until 8 PM EDT Thursday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 95 to 100. * WHERE. Northern Middlesex and Northern New London Counties. * WHEN. Until 8 PM EDT Thursday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values around 100. * WHERE. Northern Middlesex and Northern New London Counties. * WHEN. Until 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values around 100 today and 95 to 100 on Friday. * WHERE. Northern Fairfield and Northern New Haven Counties. * WHEN. Until 8 PM EDT Friday. * 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 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 Connecticut Department of Energy and Environmental Protection website at: https://portal.ct.gov/deep

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 Connecticut Department of Energy and Environmental Protection has issued an Air Quality Action Day for the following counties: Fairfield, New Haven, and Northern Middlesex, from 11 AM to 11 PM EDT on Thursday. An Air Quality Action Day means that Ground Level Ozone within the region may approach or exceed unhealthy standards. For additional information, please visit the Connecticut Department of Energy and Environmental Protection Web site at http://www.ct.gov/deep/aqi

The New York State Department of Environmental Conservation has issued an Air Quality Health Advisory for the following counties: Nassau, and Suffolk, from 11 AM to 11 PM EDT Thursday. Air quality levels in outdoor air are predicted to be greater than an Air Quality Index value of 100 for the pollutant of Ground Level Ozone. The Air Quality Index, or AQI, was created as an easy way to correlate levels of different pollutants to one scale. The higher the AQI value, the greater the health concern. When pollution levels are elevated, the New York State Department of Health recommends that individuals consider limiting strenuous outdoor physical activity to reduce the risk of adverse health effects. People who may be especially sensitive to the effects of elevated levels of pollutants include the very young, and those with preexisting respiratory problems such as asthma or heart disease. Those with symptoms should consider consulting their personal physician. A toll free air quality hotline has been established so New York residents can stay informed on the air quality situation. The toll free number is 1 800 5 3 5, 1 3 4 5.

* 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.