* WHAT. For the Small Craft Advisory, southwest winds 15 to 25 kt with gusts up to 30 kt. For the Gale Warning, west winds 20 to 30 kt with gusts up to 45 kt and waves 2 to 4 ft expected. * WHERE. Tidal Potomac River from Key Bridge to Cobb Island MD, Chesapeake Bay north of Sandy Point MD, Patapsco River including Baltimore Harbor, Chester River to Queenstown MD, and Patuxent River to Broomes Island MD. * WHEN. For the Small Craft Advisory, until 6 AM EST Thursday. For the Gale Warning, from 6 AM to 7 PM EST Thursday. * IMPACTS. Strong winds will cause hazardous waves which could capsize or damage vessels.

* WHAT. West winds 20 to 30 mph with gusts up to 55 mph expected. * WHERE. Portions of DC, central, north central, northeast, northern, southern, and western Maryland, central, northern, northwest, and western Virginia, and eastern and panhandle West Virginia. * WHEN. Until 6 PM EST this evening. * IMPACTS. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. The cold wind chills could result in hypothermia if precautions are not taken.

* WHAT. West winds 15 to 25 mph with gusts 45 to 55 mph expected. * WHERE. Central Pennsylvania. * WHEN. From 1 AM to 7 PM EST Thursday. * IMPACTS. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

* WHAT. West winds 15 to 25 mph with gusts 45 to 55 mph expected. * WHERE. A portion of central Pennsylvania. * WHEN. Until 7 PM EST this evening. * IMPACTS. The wind could blow down tree limbs and cause power outages. The wind will also create very poor visibility when snow is falling at the same time. Drifting snow may also lead to poor road conditions even when the snow is not falling. * ADDITIONAL DETAILS. The risk for power outages and treacherous travel will be greatest across the Allegheny Mountains and Laurel Highlands.

* WHAT. West winds 20 to 30 mph with gusts up to 55 mph expected. * WHERE. Portions of DC, central, northern, southern, and western Maryland, central and northern Virginia, and eastern West Virginia. * WHEN. Until 6 PM EST this evening. * IMPACTS. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Strong offshore winds will persist through Friday evening. This will result in tides of 1 to 2 feet below mean lower low water in the tidal Potomac River, and the Chesapeake Bay and adjoining estuaries north of Smith Point VA. Mariners should check navigation charts and be careful not to ground their vessel, particularly when venturing away from the main channel.

* WHAT. West winds 20 to 30 kt with gusts up to 45 kt and waves 2 to 4 ft. * WHERE. Tidal Potomac River from Key Bridge to Smith Point VA, and Chesapeake Bay and adjoining estuaries north of Smith Point VA. * WHEN. Until 7 PM EST this evening. * IMPACTS. Strong winds will cause hazardous waves which could capsize or damage vessels.