* WHAT. South winds 10 to 15 kt with gusts up to 20 kt. * WHERE. Tidal Potomac River from Key Bridge to Smith Point VA, and Chesapeake Bay and adjoining estuaries north of Smith Point VA. * WHEN. Until 5 AM EDT Wednesday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. Flash flooding caused by excessive rainfall is possible. * WHERE. Portions of northeast and northern Maryland, including the following areas, in northeast Maryland, Cecil. In northern Maryland, Northern Baltimore, Northwest Harford, Southeast Harford and Southern Baltimore. * WHEN. Through late tonight. * IMPACTS. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS. - Recent heavy rainfall has significantly lowered flash flood guidance in northeast Maryland in recent days, including several inches today in isolated spots. More torrential rainfall is possible this afternoon as multiple mesoscale convective complexes push through, which may result in flash flooding. Generally, most places will get another inch or so form this, but isolated spots where training occurs could see 2 to 3 inches of rainfall in a relatively short period of time. - Please visit www.weather.gov/safety/flood for flood safety and preparedness information

The Maryland Department of the Environment has issued a Code ORANGE Air Quality Alert Tuesday for the Hagerstown area. 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.