* WHAT. Flash flooding caused by excessive rainfall is possible. * WHERE. Including the following , District of Columbia, including the following areas in Maryland, Central and Southeast Montgomery, Charles, Prince Georges and St. Marys, and including the following areas in Virginia, Albemarle, Arlington/Falls Church/Alexandria, Central and Southeast Prince William/Manassas/Manassas Park, Culpeper, Fairfax, Greene, King George, Madison, Orange, Southern Fauquier, Spotsylvania and Stafford. * WHEN. From this evening through late tonight. * IMPACTS. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS. - Showers and thunderstorms will increase in coverage late this afternoon through this evening. Some thunderstorms will contain heavy rainfall, with rainfall amounts around 1 to 3 inches possible within an hour or two. Storms may also train over the same areas, causing the possibility for locally higher amounts around 4 to 5 inches of rain within a few hours. Heavy rainfall in a short period of time combining with already saturated soils means that creeks and streams may rapidly rise out of their banks along with the potential for flash flooding in urban areas. - Please visit www.weather.gov/safety/flood for flood safety and preparedness information

* 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, Central and Southeast Montgomery, Charles, Prince Georges and St. Marys, and Virginia, including the following areas, Albemarle, Arlington/Falls Church/Alexandria, Central and Southeast Prince William/Manassas/Manassas Park, Culpeper, Fairfax, Greene, King George, Madison, Orange, Southern Fauquier, Spotsylvania and Stafford. * WHEN. From 6 PM EDT this evening through late tonight. * IMPACTS. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS. - Showers and thunderstorms will increase in coverage late this afternoon through this evening. Some thunderstorms will contain heavy rainfall, with rainfall amounts around 1 to 3 inches possible within an hour or two. Storms may also train over the same areas, causing the possibility for locally higher amounts around 4 to 5 inches of rain within a few hours. Heavy rainfall in a short period of time combining with already saturated soils means that creeks and streams may rapidly rise out of their banks along with the potential for flash flooding in urban areas. - Please visit www.weather.gov/safety/flood for flood safety and preparedness information

SMWLWX The National Weather Service in Sterling Virginia has issued a * Special Marine Warning for. Tidal Potomac from Cobb Island MD to Smith Point VA. Tidal Potomac from Indian Head to Cobb Island MD. * Until 900 PM EDT. * At 805 PM EDT, strong thunderstorms were located along a line extending from Fairview Beach to near Colonial Beach to Westmoreland State Park, moving north at 15 knots. HAZARD. Wind gusts 34 knots or greater. SOURCE. Radar indicated. IMPACT. Boaters in small craft could be thrown overboard by suddenly higher winds and waves capsizing their vessel. * Locations impacted include. Potomac Creek, Widewater, Saint Clements Bay, Maryland Point, Nanjemoy Creek, Port Tobacco River, Smallwood State Park, Quantico, Cobb Island, Coltons Point, Swan Point, Nomini Bay, Mathias Point, U.S. 301 Nice Memorial Bridge, Wicomico River, Popes Creek, Brent Point, Westmoreland State Park, Fairview Beach, and Dahlgren.

For the following areas. Tidal Potomac from Cobb Island MD to Smith Point VA. Tidal Potomac from Indian Head to Cobb Island MD. At 839 PM EDT, strong thunderstorms were located along a line extending from near Maryland Point to U.S. 301 Nice Memorial Bridge to Wicomico River, moving north at 15 knots. HAZARD. Wind gusts 34 knots or greater. SOURCE. Observed wind. IMPACT. Boaters in small craft could be thrown overboard by suddenly higher winds and waves capsizing their vessel. Locations impacted include. Potomac Creek, Widewater, Saint Clements Bay, Maryland Point, Nanjemoy Creek, Port Tobacco River, Smallwood State Park, Quantico, Cobb Island, Coltons Point, Swan Point, Nomini Bay, Mathias Point, U.S. 301 Nice Memorial Bridge, Wicomico River, Popes Creek, Brent Point, Westmoreland State Park, Fairview Beach, and Dahlgren.

SMWLWX The National Weather Service in Sterling Virginia has issued a * Special Marine Warning for. Tidal Potomac from Key Bridge to Indian Head MD. * Until 915 PM EDT. * At 825 PM EDT, a strong thunderstorm was located over Reagan National Airport, moving east at 20 knots. HAZARD. Wind gusts 34 knots or greater. SOURCE. Radar indicated. IMPACT. Boaters in small craft could be thrown overboard by suddenly higher winds and waves capsizing their vessel. * Locations impacted include. Tidal Basin, Reagan National Airport, Woodrow Wilson Bridge, Key Bridge, National Harbor, Alexandria, Fort Hunt, and Fort Washington.

A few southerly to southwesterly wind gusts to near 20 knots are possible early this evening. Inexperienced mariners, especially those operating smaller vessels, should exercise extra caution if navigating the waters during this time.

* WHAT. Flash flooding caused by excessive rainfall continues to be possible. * WHERE. DC, and portions of Maryland, including the following areas, Central and Southeast Montgomery, Charles, Prince Georges and St. Marys, and Virginia, including the following areas, Albemarle, Arlington/Falls Church/Alexandria, Central and Southeast Prince William/Manassas/Manassas Park, Culpeper, Fairfax, Greene, King George, Madison, Orange, Southern Fauquier, Spotsylvania and Stafford. * WHEN. Until 2 AM EDT Saturday. * IMPACTS. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS. - Showers and thunderstorms will increase in coverage through this evening. Some thunderstorms will contain heavy rainfall, with rainfall amounts around 1 to 3 inches possible within an hour or two. Storms may also train over the same areas, causing the possibility for locally higher amounts around 4 to 5 inches of rain within a few hours. Heavy rainfall in a short period of time combining with already saturated soils means that creeks and streams may rapidly rise out of their banks along with the potential for flash flooding in urban areas. - Please visit www.weather.gov/safety/flood for flood safety and preparedness information.

FFWLWX The National Weather Service in Sterling Virginia has issued a * Flash Flood Warning for. District of Columbia. Southeastern Montgomery County in central Maryland. Northwestern Prince Georges County in central Maryland. Arlington County in northern Virginia. Northern Fairfax County in northern Virginia. The City of Alexandria in northern Virginia. The City of Falls Church in northern Virginia. * Until midnight EDT tonight. * At 811 PM EDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1 and 3 inches of rain have fallen. The expected rainfall rate is 1.5 to 3 inches in 1 hour. Additional rainfall amounts of 1 to 3 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD. Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE. Radar. IMPACT. Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. * Some locations that will experience flash flooding include. Arlington. Alexandria. Rockville. Bethesda. Reston. Annandale. Springfield. College Park. Herndon. Greenbelt. Fairfax. Langley Park. Beltsville. Vienna. Falls Church. Huntington.