* WHAT. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 105. For the Heat Advisory, heat index values up to 100 expected. * WHERE. In Maine, Southern Somerset, Southern Franklin, and Southern Oxford Counties. In New Hampshire, Northern Carroll County. * WHEN. For the Excessive Heat Warning, until 8 PM EDT this evening. For the Heat Advisory, from 11 AM to 7 PM EDT Thursday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS. Tonight's warm overnight low temperatures mainly in the 70s will result in greater cumulative heat stress.

* WHAT. For the Heat Advisory, heat index values up to 100. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 105 expected. * WHERE. In Maine, Coastal Waldo, Interior Waldo, Knox, Lincoln, Sagadahoc, Coastal Cumberland, and Coastal York Counties. In New Hampshire, Coastal Rockingham County. * WHEN. For the Heat Advisory, until 8 PM EDT this evening. For the Excessive Heat Warning, from 11 AM to 7 PM EDT Thursday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS. Tonight's overnight low temperatures mainly in the 70s will result in greater cumulative heat stress.

* WHAT. For the first Excessive Heat Warning, dangerously hot conditions with heat index values up to 105. For the second Excessive Heat Warning, 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. For the first Excessive Heat Warning, until 8 PM EDT this evening. For the second Excessive Heat Warning, from 11 AM to 7 PM EDT Thursday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS. Tonight's warm overnight low temperatures mainly in the 70s will result in greater cumulative heat stress.

* WHAT. Dangerously hot conditions with heat index values up to 108 expected. * WHERE. Coastal Hancock, Central Washington, Interior Hancock, and Southern Penobscot Counties. * WHEN. From 11 AM to 8 PM EDT Thursday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Heat index values up to 100 expected. * WHERE. Northern Penobscot, Southern Piscataquis, Coastal Washington, Northern Washington, Southeast Aroostook, Northeast Aroostook, and Central Penobscot Counties. * WHEN. From 11 AM to 8 PM EDT Thursday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Dangerously hot conditions with heat index values up to 106 expected. * WHERE. Portions of south central, southwest, and western Maine and central, northern, and southern New Hampshire. * WHEN. From 11 AM to 7 PM EDT Thursday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Dangerously hot conditions with heat index values up to 108 expected. * WHERE. In Maine, Coastal Waldo, Interior Waldo, Knox, Lincoln, Sagadahoc, Coastal Cumberland, and Coastal York Counties. In New Hampshire, Coastal Rockingham County. * WHEN. From 11 AM to 7 PM EDT Thursday. * 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, Southern Franklin, and Southern Oxford Counties. In New Hampshire, Northern Carroll County. * WHEN. From 11 AM to 7 PM EDT Thursday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.