Despite morning clouds and rainfall. warmer and more unstable air will push into the region through early this afternoon ahead of an advancing cold front. This will set the stage for a developing severe weather event. Thunderstorms have developed across upstate New York as of 12pm. These storms are expected to intensify and expand in coverage as they move east through the afternoon. Storms are expected to move into western New Hampshire after 2pm. reaching western Maine after 4pm. The severe weather threat should come to an end after 8pm. Storms will have the potential to produce damaging winds. large hail and isolated tornadoes. Torrential rainfall with localized flooding will also be possible. Please be alert to changing weather conditions and have a way to receive warnings from the National Weather Service.

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

* WHAT. South winds 10 to 20 kt with gusts up to 25 kt and waves 1 to 2 feet expected. * WHERE. Boston Harbor. * WHEN. From noon to 8 PM EDT Sunday. * IMPACTS. Conditions will be hazardous to small craft.

THE NATIONAL WEATHER SERVICE HAS ISSUED TORNADO WATCH 448 IN EFFECT UNTIL 8 PM EDT THIS EVENING FOR THE FOLLOWING AREAS IN MAINE THIS WATCH INCLUDES 5 COUNTIES IN SOUTHWEST MAINE ANDROSCOGGIN CUMBERLAND YORK IN WESTERN MAINE FRANKLIN OXFORD IN NEW HAMPSHIRE THIS WATCH INCLUDES 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, ANDOVER, ASHLAND, ATKINSON, AUBURN, AVON, BARRINGTON, BERLIN, BETHEL, BETHLEHEM, BIDDEFORD, BOSCAWEN, BRIDGEWATER, BROOKFIELD, BRYANT POND, BYRON, CANTERBURY, CAPE ELIZABETH, CHESTER, CLAREMONT, COBURN GORE, CONCORD, CORNISH, CROYDON, DAVIS, DERRY, DOVER, DUMMER, DUNBARTON, DURHAM, ERROL, FARMINGTON, GILFORD, GILSUM, GOSHEN, GRANTHAM, GREENE, HAMPSTEAD, HANOVER, HOLLIS, JACKSON, KEENE, KINGFIELD, LACONIA, LEBANON, LEBANON, LEMPSTER, LEWISTON, LINCOLN, LITTLETON, LOUDON, LYME, MADBURY, MANCHESTER, MARLOW, MILAN, MILLSFIELD, MINOT, NASHUA, NEW GLOUCESTER, NEWTON, OLD ORCHARD BEACH, OQUOSSOC, OSSIPEE, PELHAM, PLAISTOW, PORTLAND, RANGELEY, ROCHESTER, ROLLINSFORD, SABATTUS, SACO, SALEM, SANFORD, SOMERSWORTH, SOUTH PORTLAND, SUGAR HILL, SULLIVAN, SURRY, TUFTONBORO, TURNER, UNITY, UPTON, WAKEFIELD, WALES, WESTBROOK, WILSONS MILLS, WOLFEBORO, AND YORK POND.

THE NATIONAL WEATHER SERVICE HAS ISSUED TORNADO WATCH 448 IN EFFECT UNTIL 8 PM EDT THIS EVENING FOR THE FOLLOWING AREAS IN MASSACHUSETTS THIS WATCH INCLUDES 6 COUNTIES IN CENTRAL MASSACHUSETTS WORCESTER IN EASTERN MASSACHUSETTS MIDDLESEX IN NORTHEASTERN MASSACHUSETTS ESSEX IN WESTERN MASSACHUSETTS FRANKLIN HAMPDEN HAMPSHIRE THIS INCLUDES THE CITIES OF FITCHBURG, FRAMINGHAM, GLOUCESTER, GREENFIELD, LAWRENCE, LOWELL, NORTHAMPTON, SPRINGFIELD, AND WORCESTER.