* WHAT. Heat index values up to 101. * WHERE. Morgan County. * WHEN. Until 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur.

* WHAT. For the first Heat Advisory, heat index values up to 106. For the second Heat Advisory, heat index values up to 107 expected. * WHERE. Portions of central, north central, northeast, northern and southern Maryland, The District of Columbia and central, northern and northwest Virginia. * WHEN. For the first Heat Advisory, until 8 PM EDT this evening. For the second Heat Advisory, from noon to 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur.

* WHAT. For the first Heat Advisory, heat index values up to 103. For the second Heat Advisory, heat index values up to 104 expected. * WHERE. In Maryland, Washington County. In Virginia, Rockingham, Shenandoah, Frederick VA, Page, Warren and Clarke Counties. In West Virginia, Berkeley and Jefferson Counties. * WHEN. For the first Heat Advisory, until 8 PM EDT this evening. For the second Heat Advisory, from noon to 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur.

* WHAT. For the first Heat Advisory, heat index values up to 102. For the second Heat Advisory, heat index values up to 105 expected. * WHERE. In Maryland, Washington County. In Virginia, Rockingham, Shenandoah, Frederick VA, Page, Warren and Clarke Counties. In West Virginia, Berkeley and Jefferson Counties. * WHEN. For the first Heat Advisory, until 8 PM EDT this evening. For the second Heat Advisory, from noon to 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur.

* WHAT. Heat index values up to 101. * WHERE. Morgan County. * WHEN. Until 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur.

* WHAT. For the first Heat Advisory, heat index values up to 108. For the second Heat Advisory, heat index values up to 108 expected. * WHERE. Portions of central, north central, northeast, northern and southern Maryland, The District of Columbia and central, northern and northwest Virginia. * WHEN. For the first Heat Advisory, until 8 PM EDT this evening. For the second Heat Advisory, from noon to 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur.

* WHAT. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 110. For the Heat Advisory, heat index values up to 107 expected. * WHERE. Southern Baltimore County. * WHEN. For the Excessive Heat Warning, until 8 PM EDT this evening. For the Heat Advisory, from noon to 8 PM EDT Wednesday. * 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 as well. Ensure to stay hydrated and find ways to stay cool.

* WHAT. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 110. For the Heat Advisory, heat index values up to 107 expected. * WHERE. Southern Baltimore County. * WHEN. For the Excessive Heat Warning, until 8 PM EDT this evening. For the Heat Advisory, from noon to 8 PM EDT Wednesday. * 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.

* WHAT. For the first Heat Advisory, heat index values up to 101. For the second Heat Advisory, heat index values up to 104 expected. * WHERE. Morgan County. * WHEN. For the first Heat Advisory, until 8 PM EDT this evening. For the second Heat Advisory, from noon to 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS. Very warm and humid conditions will persist into the overnight hours. Ensure to stay hydrated and find ways to stay cool.

* WHAT. For the first Heat Advisory, heat index values up to 108. For the second Heat Advisory, heat index values up to 108 expected. * WHERE. Portions of central, north central, northeast, northern and southern Maryland, The District of Columbia and central, northern and northwest Virginia. * WHEN. For the first Heat Advisory, until 8 PM EDT this evening. For the second Heat Advisory, from noon to 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS. Very warm and humid conditions will persist into the overnight hours. Ensure to stay hydrated and find ways to stay cool.

* WHAT. For the first Heat Advisory, heat index values up to 102. For the second Heat Advisory, heat index values up to 105 expected. * WHERE. In Maryland, Washington County. In Virginia, Rockingham, Shenandoah, Frederick VA, Page, Warren and Clarke Counties. In West Virginia, Berkeley and Jefferson Counties. * WHEN. For the first Heat Advisory, until 8 PM EDT this evening. For the second Heat Advisory, from noon to 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS. Very warm and humid conditions will persist into the overnight hours. Ensure to stay hydrated and find ways to stay cool.

* WHAT. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 110. For the Heat Advisory, heat index values up to 107 expected. * WHERE. Southern Baltimore County. * WHEN. For the Excessive Heat Warning, until 8 PM EDT this evening. For the Heat Advisory, from noon to 8 PM EDT Wednesday. * 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.

* WHAT. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 110. For the Heat Advisory, heat index values up to 107 expected. * WHERE. Portions of central and southern Maryland, The District of Columbia and northern Virginia. * WHEN. For the Excessive Heat Warning, until 8 PM EDT this evening. For the Heat Advisory, from noon to 8 PM EDT Wednesday. * 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.

* WHAT. For the first Heat Advisory, heat index values up to 108. For the second Heat Advisory, heat index values up to 108 expected. * WHERE. Portions of central, north central, northeast and northern Maryland and central, northern and northwest Virginia. * WHEN. For the first Heat Advisory, until 8 PM EDT this evening. For the second Heat Advisory, from noon to 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS. Very warm and humid conditions will persist into the overnight hours. Ensure to stay hydrated and find ways to stay cool.

* WHAT. For the first Heat Advisory, heat index values up to 101. For the second Heat Advisory, heat index values up to 104 expected. * WHERE. Morgan County. * WHEN. For the first Heat Advisory, until 8 PM EDT this evening. For the second Heat Advisory, from noon to 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS. Very warm and humid conditions will persist into the overnight hours. Ensure to stay hydrated and find ways to stay cool.

* WHAT. For the first Heat Advisory, heat index values up to 102. For the second Heat Advisory, heat index values up to 105 expected. * WHERE. In Maryland, Washington County. In Virginia, Rockingham, Shenandoah, Frederick VA, Page, Warren and Clarke Counties. In West Virginia, Berkeley and Jefferson Counties. * WHEN. For the first Heat Advisory, until 8 PM EDT this evening. For the second Heat Advisory, from noon to 8 PM EDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS. Very warm and humid conditions will persist into the overnight hours. Ensure to stay hydrated and find ways to stay cool.

* WHAT. Oppressive heat with afternoon heat index values between 100 and 105. * WHERE. Adams, Cumberland, Dauphin, Franklin, Lancaster, Lebanon, Perry, and York Counties. * WHEN. Until 8 PM EDT Wednesday. * IMPACTS. High temperatures and humidity may cause heat illnesses.