* WHAT. Heat index values up to 104 this afternoon and between 95 and 100 degrees. * 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.

THE NATIONAL WEATHER SERVICE HAS EXTENDED SEVERE THUNDERSTORM WATCH 438 TO INCLUDE THE FOLLOWING AREAS UNTIL 11 PM EDT THIS EVENING THIS WATCH INCLUDES THE FOLLOWING ADJACENT COASTAL WATERS BOSTON HARBOR COASTAL WATERS EAST OF IPSWICH BAY AND THE STELLWAGEN BANK NATIONAL MARINE SANCTUARY

* WHAT. Heat index values up to 96. * 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 95. * WHERE. Northern Middlesex and Northern New London Counties. * WHEN. Until 6 PM EDT Saturday. * 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 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

THE NATIONAL WEATHER SERVICE HAS EXTENDED SEVERE THUNDERSTORM WATCH 438 TO INCLUDE THE FOLLOWING AREAS UNTIL 11 PM EDT THIS EVENING IN MASSACHUSETTS THIS WATCH INCLUDES 4 COUNTIES IN EASTERN MASSACHUSETTS NORFOLK SUFFOLK IN WESTERN MASSACHUSETTS HAMPDEN HAMPSHIRE THIS INCLUDES THE CITIES OF BOSTON, FOXBOROUGH, NORTHAMPTON, QUINCY, AND SPRINGFIELD.

SEVERE THUNDERSTORM WATCH 438, PREVIOUSLY IN EFFECT UNTIL 8 PM EDT THIS EVENING, IS NOW IN EFFECT UNTIL 11 PM EDT THIS EVENING FOR THE FOLLOWING AREAS IN MASSACHUSETTS THIS WATCH INCLUDES 4 COUNTIES IN CENTRAL MASSACHUSETTS WORCESTER IN EASTERN MASSACHUSETTS MIDDLESEX IN NORTHEASTERN MASSACHUSETTS ESSEX IN WESTERN MASSACHUSETTS FRANKLIN THIS INCLUDES THE CITIES OF FITCHBURG, FRAMINGHAM, GLOUCESTER, GREENFIELD, LAWRENCE, LOWELL, AND WORCESTER.