* WHAT. For the Heat Advisory, heat index values up to 98 expected. For the Excessive Heat Watch, dangerously hot conditions with heat index values up to 104 possible. * WHERE. Areas along the Interstate 95 corridor. * WHEN. For the Heat Advisory, from 10 AM Tuesday to 6 AM EDT Wednesday. For the Excessive Heat Watch, from Wednesday morning through Saturday evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS. Excessive heat impacts may continue into Sunday.

* WHAT. South winds 10 to 20 kt with gusts up to 25 kt. * WHERE. Chesapeake Bay from Pooles Island MD to Smith Point VA, Tidal Potomac from Cobb Island MD to Smith Point VA, Eastern Bay, Choptank River to Cambridge MD and the Little Choptank River, and Tangier Sound and the inland waters surrounding Bloodsworth Island. * WHEN. Until 2 AM EDT Tuesday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. South winds 10 to 15 kt with gusts up to 25 kt. * WHERE. Chesapeake Bay north of Pooles Island MD, Patapsco River including Baltimore Harbor, Chester River to Queenstown MD and Patuxent River to Broomes Island MD. * WHEN. Until midnight EDT tonight. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. Up to one half foot of inundation above ground level expected in low lying areas due to tidal flooding. * WHERE. Shoreline in Anne Arundel County. * WHEN. From 1 AM to 7 AM EDT Tuesday, especially around the time of high tide. * IMPACTS. At 2.8 feet, flooding of some of the parking area near Dock Street in Annapolis may occur, with water surrounding the Alex Haley Memorial. * ADDITIONAL DETAILS. Tides one to one and a half feet above normal. The next high tide at Annapolis U.S. Naval Academy is at 3:35 AM.

* WHAT. South winds 10 to 20 kt with gusts up to 25 kt. * WHERE. Chesapeake Bay from Pooles Island MD to Smith Point VA, Tidal Potomac from Cobb Island MD to Smith Point VA, Eastern Bay, Choptank River to Cambridge MD and the Little Choptank River, and Tangier Sound and the inland waters surrounding Bloodsworth Island. * WHEN. Until 6 AM EDT Tuesday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. South winds 10 to 15 kt with gusts up to 20 kt. * WHERE. Chesapeake Bay north of Pooles Island MD, Patapsco River including Baltimore Harbor, Chester River to Queenstown MD and Patuxent River to Broomes Island MD. * WHEN. Until midnight EDT tonight. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. For the Heat Advisory, heat index values up to 98 expected. For the Excessive Heat Watch, dangerously hot conditions with heat index values up to 104 possible. * WHERE. Portions of northern Delaware, central, northern, and southern New Jersey, and southeast Pennsylvania. * WHEN. For the Heat Advisory, from 10 AM Tuesday to 6 AM EDT Wednesday. For the Excessive Heat Watch, from Wednesday morning through Saturday evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS. Excessive heat impacts may continue into Sunday.

* WHAT. Heat index values up to 100 expected. * WHERE. Central Pennsylvania. * WHEN. From noon Tuesday to 8 PM EDT Thursday. * IMPACTS. Hot temperatures and high humidity may cause heat-related illnesses. * ADDITIONAL DETAILS. The heat wave is expected to continue into the weekend with the hottest temperatures of the summer so far. The longevity of the heat wave has not been experienced in decades during the month of June.