* WHAT. South winds 10 to 15 kt with gusts up to 20 kt expected. * WHERE. Chesapeake Bay from Pooles Island MD to North Beach MD, Patapsco River including Baltimore Harbor, Chester River to Queenstown MD, Eastern Bay, Choptank River to Cambridge MD and the Little Choptank River, and Patuxent River to Broomes Island MD. * WHEN. Until 2 AM EDT Sunday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. Heat index values as high as 104. * WHERE. A portion of central Pennsylvania. * WHEN. Until 8 PM EDT Sunday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Southwest winds 10 to 15 kt with gusts up to 20 kt expected. * WHERE. Tidal Potomac River from Key Bridge to Cobb Island MD. * WHEN. From 11 AM to 6 PM EDT Sunday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. South winds 10 to 15 kt with gusts up to 25 kt, shifting to southwest winds on Sunday. * WHERE. Chesapeake Bay from Smith Point VA to Pooles Island MD and adjoining estuaries, and Tidal Potomac from Cobb Island MD to Smith Point VA. * WHEN. Until 6 PM EDT Sunday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. For the first Heat Advisory, heat index values up to 105. For the second Heat Advisory, heat index values up to 102 expected. * WHERE. Washington County. * WHEN. For the first Heat Advisory, until 8 PM EDT this evening. For the second Heat Advisory, from 11 AM to 7 PM EDT Sunday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS. Oppressive heat and humidity will overspread the area through Sunday before a cold front tracks through early Monday. Little relief from the heat is expected tonight with low temperatures in the low to mid 70s, which will compound heat stress on those without air conditioning.

* WHAT. Heat index values up to 104 expected. * WHERE. Portions of western Maryland, northwest and western Virginia and eastern and panhandle West Virginia. * WHEN. Until 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS. Oppressive heat and humidity will overspread the area through Sunday before a cold front tracks through early Monday. Little relief from the heat is expected tonight with low temperatures in the low to mid 70s, which will compound heat stress on those without air conditioning.

* WHAT. For the first Heat Advisory, heat index values up to 108 are expected. For the second Heat Advisory, heat index values up to 105 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 11 AM to 7 PM EDT Sunday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS. Oppressive heat and humidity will overspread the area through Sunday before a cold front tracks through early Monday. Little relief from the heat is expected tonight with low temperatures in the 70s, with lower 80s near Washington, D.C. and Baltimore. This will compound heat stress on those without air conditioning.

The Maryland Department of the Environment has issued a Code ORANGE Air Quality Alert Saturday for Northern Baltimore. A Code Orange Air Quality Alert means that air pollution concentrations within the region may become unhealthy for sensitive groups. Sensitive groups include children, people suffering from asthma, heart disease or other lung diseases and the elderly. The effects of air pollution can be minimized by avoiding strenuous activity or exercise outdoors. For more information on ground-level ozone and fine particles visit the web site mde.maryland.gov/programs/air/AirQualityMonitoring/Pages/index.aspx.

The Maryland Department of the Environment has issued a Code ORANGE Air Quality Alert Saturday for the Baltimore City Metro and Annapolis region. A Code Orange Air Quality Alert means that air pollution concentrations within the region may become unhealthy for sensitive groups. Sensitive groups include children, people suffering from asthma, heart disease or other lung diseases and the elderly. The effects of air pollution can be minimized by avoiding strenuous activity or exercise outdoors. For more information on ground-level ozone and fine particles visit the web site mde.maryland.gov/programs/air/AirQualityMonitoring/Pages/index.aspx.