* WHAT. For the Heat Advisory, heat index values up to 109 expected. For the Excessive Heat Watch, dangerously hot conditions with heat index values at or above 110 possible. * WHERE. Portions of northeast North Carolina and central, east central, eastern, north central, south central, and southeast Virginia. * WHEN. For the Heat Advisory, from 11 AM to 8 PM EDT Thursday. For the Excessive Heat Watch, from Friday morning through Friday evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Heat index values up to 106 expected. * WHERE. In Maryland, Dorchester, Inland Worcester, Somerset, and Wicomico Counties. In Virginia, Northampton and Accomack Counties. * WHEN. From 11 AM to 8 PM EDT Thursday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.