* WHAT. South winds 10 to 15 kt expected with gusts up to 20 kt expected. * WHERE. Chesapeake Bay north of Sandy Point MD, Patapsco River including Baltimore Harbor, and Chester River to Queenstown MD. * WHEN. Until noon EDT Thursday. * IMPACTS. Conditions will be hazardous to small craft.

A cluster of showers and thunderstorms will crawl along the Maryland border through 6 PM. The area between the Turnpike and the Maryland line is the most likely to see short periods of torrential rain. The rain could be intense at times, with rainfall rates near 2 inches per hour. Rainfall rates like this could lead to minor flooding, especially in urban areas.

* WHAT. Flash flooding caused by excessive rainfall continues to be possible. * WHERE. Portions of DC, including the following , District of Columbia, Maryland, including the following areas, Anne Arundel, Central and Southeast Howard, Central and Southeast Montgomery, Northwest Howard, Northwest Montgomery, Prince Georges and Southern Baltimore, and northern Virginia, including the following areas, Arlington/Falls Church/Alexandria, Central and Southeast Prince William/Manassas/Manassas Park, Eastern Loudoun, Fairfax and Northwest Prince William. * WHEN. Until 10 PM EDT this evening. * IMPACTS. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. * ADDITIONAL DETAILS. - Multiple rounds of heavy showers and thunderstorms will move across the area today into this evening. Rainfall amounts of 1 to 2 inches are likely, with isolated amounts of 3 to 4 inches possible. - Please visit www.weather.gov/safety/flood for flood safety and preparedness information

TORLWX The National Weather Service in Sterling Virginia has issued a * Tornado Warning for. West central Montgomery County in central Maryland. Northeastern Loudoun County in northern Virginia. * Until 700 PM EDT. * At 633 PM EDT, a severe thunderstorm capable of producing a tornado was located near Purcellville, or near Leesburg, moving east at 20 mph. HAZARD. Tornado. SOURCE. Radar indicated rotation. IMPACT. For those in the direct path of a tornado touchdown, flying debris will be dangerous to those caught without shelter. Damage to roofs, siding, and windows may occur. Mobile homes may be damaged or destroyed. Tree damage is likely. * This dangerous storm will be near. Leesburg around 640 PM EDT. Other locations impacted by this tornadic thunderstorm include Paeonian Springs and Beallsville.

At 639 PM EDT, a severe thunderstorm capable of producing a tornado was located near Leesburg, moving east at 20 mph. HAZARD. Tornado. SOURCE. Radar indicated rotation. IMPACT. For those in the direct path of a tornado touchdown, flying debris will be dangerous to those caught without shelter. Damage to roofs, siding, and windows may occur. Mobile homes may be damaged or destroyed. Tree damage is likely. This tornadic thunderstorm will remain over mainly rural areas of west central Montgomery and east central Loudoun Counties, including the following locations. Beallsville.

At 644 PM EDT, a confirmed tornado was located near Leesburg, moving east at 20 mph. HAZARD. Damaging tornado. SOURCE. Radar confirmed tornado. IMPACT. For those in the direct path of a tornado touchdown, flying debris will be dangerous to those caught without shelter. Damage to roofs, siding, and windows may occur. Mobile homes may be damaged or destroyed. Tree damage is likely. Locations impacted include. Poolesville and Beallsville.

At 649 PM EDT, a severe thunderstorm capable of producing a tornado was located near Leesburg, moving east at 20 mph. HAZARD. Tornado. SOURCE. Radar indicated rotation. IMPACT. For those in the direct path of a tornado touchdown, flying debris will be dangerous to those caught without shelter. Damage to roofs, siding, and windows may occur. Mobile homes may be damaged or destroyed. Tree damage is likely. Locations impacted include. Poolesville and Beallsville.