* 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. 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.

* 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.

The areas affected include. Boston Harbor. At 757 PM EDT, Doppler radar indicated a gust front, capable of producing winds to around 30 knots. This front was located along a line extending from 6 nm northwest of Lynn to 12 nm northwest of Boston to 25 nm west of Revere, moving southeast at 25 knots. Locations impacted include. Boston Harbor, Broad Sound, Quincy Harbor, and Boston Light.

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

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 WILL ALLOW SEVERE THUNDERSTORM WATCH 438 TO EXPIRE AT 8 PM EDT THIS EVENING FOR THE FOLLOWING AREAS IN MAINE THIS ALLOWS TO EXPIRE 11 COUNTIES IN SOUTH CENTRAL MAINE KENNEBEC KNOX LINCOLN SAGADAHOC WALDO IN SOUTHWEST MAINE ANDROSCOGGIN CUMBERLAND YORK IN WEST CENTRAL MAINE SOMERSET IN WESTERN MAINE FRANKLIN OXFORD IN NEW HAMPSHIRE THIS ALLOWS TO EXPIRE 10 COUNTIES IN CENTRAL NEW HAMPSHIRE BELKNAP MERRIMACK STRAFFORD SULLIVAN IN NORTHERN NEW HAMPSHIRE CARROLL COOS GRAFTON IN SOUTHERN NEW HAMPSHIRE CHESHIRE HILLSBOROUGH ROCKINGHAM THIS INCLUDES THE CITIES OF ALFRED, ALNA, ANDOVER, APPLETON, ARROWSIC, ASHLAND, ATHENS, ATKINSON, AUBURN, AUGUSTA, AVON, BARRINGTON, BATH, BELFAST, BERLIN, BETHEL, BETHLEHEM, BIDDEFORD, BOSCAWEN, BOWDOIN, BOWDOINHAM, BREMEN, BRIDGEWATER, BRISTOL, BROOKFIELD, BROOKS, BRYANT POND, BYRON, CAMDEN, CANTERBURY, CAPE ELIZABETH, CHESTER, CHINA, CLAREMONT, COBURN GORE, CONCORD, CORNISH, CORNVILLE, CROYDON, DAMARISCOTTA, DAVIS, DERRY, DOVER, DRESDEN, DUMMER, DUNBARTON, DURHAM, EMBDEN, ERROL, FARMINGTON, GILFORD, GILSUM, GOSHEN, GRANTHAM, GREENE, HAMPSTEAD, HANOVER, HOLLIS, HOPE, JACKSON, JACKSON, KEENE, KINGFIELD, KNOX, LACONIA, LEBANON, LEBANON, LEMPSTER, LEWISTON, LIBERTY, LINCOLN, LITTLETON, LOUDON, LYME, MADBURY, MANCHESTER, MARLOW, MILAN, MILLSFIELD, MINOT, MONTVILLE, MORRILL, NASHUA, NEW GLOUCESTER, NEW PORTLAND, NEWCASTLE, NEWTON, OLD ORCHARD BEACH, OQUOSSOC, OSSIPEE, OWLS HEAD, PALERMO, PALMYRA, PELHAM, PHIPPSBURG, PITTSFIELD, PLAISTOW, PORTLAND, RANGELEY, ROCHESTER, ROCKLAND, ROCKPORT, ROLLINSFORD, SABATTUS, SACO, SALEM, SANFORD, SIDNEY, SKOWHEGAN, SOMERSWORTH, SOUTH PORTLAND, SUGAR HILL, SULLIVAN, SURRY, TOPSHAM, TUFTONBORO, TURNER, UNITY, UPTON, VASSALBORO, WAKEFIELD, WALES, WATERVILLE, WESTBROOK, WHITEFIELD, WILSONS MILLS, WINDSOR, WOLFEBORO, AND YORK POND.

SVRBOX The National Weather Service in Boston/Norton has issued a * Severe Thunderstorm Warning for. Essex County in northeastern Massachusetts. Northeastern Middlesex County in northeastern Massachusetts. * Until 845 PM EDT. * At 742 PM EDT, severe thunderstorms were located along a line extending from near Merrimac to near Salem to Dracut, moving east at 20 mph. HAZARD. 60 mph wind gusts. SOURCE. Radar indicated. IMPACT. Expect damage to roofs, siding, and trees. * Locations impacted include. Lowell, Lawrence, Haverhill, Methuen, Salem, Beverly, Andover, Dracut, Tewksbury, Gloucester, North Andover, Danvers, Newburyport, Amesbury, North Reading, Ipswich, Middleton, Salisbury, Georgetown, and Boxford.

SVRBOX The National Weather Service in Boston/Norton has issued a * Severe Thunderstorm Warning for. Southwestern Essex County in northeastern Massachusetts. Northeastern Worcester County in central Massachusetts. Northeastern Middlesex County in northeastern Massachusetts. * Until 900 PM EDT. * At 804 PM EDT, severe thunderstorms were located along a line extending from Andover to near Westford to near Lunenburg, moving east at 25 mph. HAZARD. 60 mph wind gusts. SOURCE. Radar indicated. IMPACT. Expect damage to roofs, siding, and trees. * Locations impacted include. Lowell, Cambridge, Lynn, Somerville, Waltham, Malden, Medford, Revere, Peabody, Arlington, Everett, Salem, Billerica, Woburn, Chelsea, Chelmsford, Andover, Watertown, Lexington, and Dracut.

SVRBOX The National Weather Service in Boston/Norton has issued a * Severe Thunderstorm Warning for. Central Worcester County in central Massachusetts. Southeastern Hampshire County in western Massachusetts. Central Middlesex County in northeastern Massachusetts. Southeastern Franklin County in western Massachusetts. Northeastern Hampden County in western Massachusetts. * Until 915 PM EDT. * At 809 PM EDT, severe thunderstorms were located along a line extending from near Princeton to Hardwick to near Hadley, moving southeast at 20 mph. HAZARD. 60 mph wind gusts. SOURCE. Radar indicated. IMPACT. Expect damage to roofs, siding, and trees. * Locations impacted include. Worcester, Framingham, Leominster, Fitchburg, Holyoke, Marlborough, Amherst, Shrewsbury, Northampton, Ludlow, Gardner, Hudson, Westborough, Grafton, Sudbury, South Hadley, Holden, Auburn, Easthampton, and Belchertown.

At 813 PM EDT, severe thunderstorms were located along a line extending from Newburyport to Boxford to near North Reading, moving east at 30 mph. HAZARD. 60 mph wind gusts. SOURCE. Radar indicated. IMPACT. Expect damage to roofs, siding, and trees. Locations impacted include. Lowell, Lawrence, Haverhill, Methuen, Salem, Beverly, Andover, Dracut, Tewksbury, Gloucester, North Andover, Danvers, Newburyport, Amesbury, North Reading, Ipswich, Middleton, Salisbury, Georgetown, and Boxford.

At 828 PM EDT, severe thunderstorms were located along a line extending from near Newbury to Hamilton to near Lynnfield, moving southeast at 20 mph. HAZARD. 60 mph wind gusts. SOURCE. Radar indicated. IMPACT. Expect damage to roofs, siding, and trees. Locations impacted include. Salem, Beverly, Andover, Gloucester, North Andover, Danvers, Newburyport, Amesbury, North Reading, Ipswich, Middleton, Salisbury, Georgetown, Boxford, Hamilton, Rockport, Newbury, Groveland, Topsfield, and Rowley.

At 826 PM EDT, severe thunderstorms were located along a line extending from Clinton to New Braintree to South Hadley, moving east at 40 mph. HAZARD. 60 mph wind gusts. SOURCE. Radar indicated. IMPACT. Expect damage to roofs, siding, and trees. Locations impacted include. Worcester, Framingham, Leominster, Holyoke, Marlborough, Amherst, Shrewsbury, Northampton, Ludlow, Hudson, Westborough, Grafton, Sudbury, South Hadley, Holden, Auburn, Easthampton, Belchertown, Wilbraham, and Northborough.

At 822 PM EDT, severe thunderstorms were located along a line extending from Middleton to Carlisle to Harvard, moving southeast at 25 mph. HAZARD. 60 mph wind gusts. SOURCE. Radar indicated. IMPACT. Expect damage to roofs, siding, and trees. Locations impacted include. Lowell, Cambridge, Lynn, Somerville, Waltham, Malden, Medford, Revere, Peabody, Arlington, Everett, Salem, Billerica, Woburn, Chelmsford, Andover, Watertown, Lexington, Tewksbury, and Melrose.

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.