* WHAT. For the Heat Advisory, heat index values to 100 expected. For the Excessive Heat Watch, dangerously hot conditions with heat index values up to 110 possible. * WHERE. Adams, Cumberland, Dauphin, Franklin, Lancaster, Lebanon, Perry, and York Counties. * WHEN. For the Heat Advisory, from noon Sunday to noon EDT Monday. For the Excessive Heat Watch, from Monday afternoon through Tuesday evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Dangerously hot conditions with heat index values up to 110 possible. * WHERE. Portions of central, north central, northeast, northern and southern Maryland, The District of Columbia and central, northern and northwest Virginia. * WHEN. From Monday morning through Monday evening. * IMPACTS. Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS. Very warm and humid conditions will persist into the overnight hours. Ensure to stay hydrated and find ways to stay cool. Another dangerously hot day is expected on Tuesday.

* WHAT. Dangerously hot conditions with heat index values up to 105 possible. * WHERE. In Maryland, Washington County. In Virginia, Shenandoah, Frederick VA, Page, Warren and Clarke Counties. In West Virginia, Morgan, Berkeley and Jefferson Counties. * WHEN. From Monday morning through Monday evening. * IMPACTS. Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS. Very warm and humid conditions will persist into the overnight hours. Ensure to stay hydrated and find ways to stay cool. Another dangerously hot day is expected on Tuesday.

* WHAT. For the Heat Advisory, heat index values to 104 expected. For the Excessive Heat Watch, dangerously hot conditions with heat index values up to 110 possible. * WHERE. Adams, Cumberland, Dauphin, Franklin, Lancaster, Lebanon, Perry, and York Counties. * WHEN. For the Heat Advisory, from noon Sunday to noon EDT Monday. For the Excessive Heat Watch, from Monday afternoon through Tuesday evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.