* WHAT. Heat index values up to 97 across northern areas and up to 100 across the Central Highlands and Downeast. * WHERE. Northern Penobscot, Southern Piscataquis, Coastal Washington, Northern Washington, Southeast Aroostook, Northeast Aroostook, and Central Penobscot Counties. * WHEN. From 11 AM this morning to 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Dangerously hot conditions with heat index values up to 107 expected. * WHERE. Coastal Hancock, Central Washington, Interior Hancock, and Southern Penobscot Counties. * WHEN. From 11 AM this morning to 8 PM EDT this evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* 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.