* WHAT. Flash flooding caused by excessive rainfall is possible. * WHERE. The District of Columbia, and portions of Maryland, including the following areas, Anne Arundel, Carroll, Central and Eastern Allegany, Central and Southeast Howard, Central and Southeast Montgomery, Charles, Eastern Garrett, Extreme Western Allegany, Frederick MD, Northern Baltimore, Northwest Harford, Northwest Howard, Northwest Montgomery, Prince Georges, Southeast Harford, Southern Baltimore, Washington and Western Garrett, Virginia, including the following areas, Albemarle, Arlington/Falls Church/Alexandria, Augusta, Central Virginia Blue Ridge, Central and Southeast Prince William/Manassas/Manassas Park, Clarke, Culpeper, Eastern Highland, Eastern Loudoun, Fairfax, Frederick VA, Greene, King George, Madison, Nelson, Northern Fauquier, Northern Virginia Blue Ridge, Northwest Prince William, Orange, Page, Rappahannock, Rockingham, Shenandoah, Southern Fauquier, Spotsylvania, Stafford, Warren, Western Highland and Western Loudoun, and West Virginia, including the following areas, Berkeley, Eastern Grant, Eastern Mineral, Eastern Pendleton, Hampshire, Hardy, Jefferson, Morgan, Western Grant, Western Mineral and Western Pendleton. * WHEN. Through 2 AM 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 form this afternoon and linger on and off through the first half of the night. Storms will be slow moving and capable of producing very heavy rainfall. Rainfall totals of 1 to 2 inches appear likely for locations that receive thunderstorms, with isolated totals of 2 to 4 inches. The strongest thunderstorms may be capable of producing 1.5 to 2.5 inches of rain in an hour. - Please visit www.weather.gov/safety/flood for flood safety and preparedness information

* WHAT. Flash flooding caused by excessive rainfall is possible. * WHERE. A portion of central Pennsylvania, including the following areas, Adams, Bedford, Blair, Cambria, Cameron, Clearfield, Columbia, Cumberland, Dauphin, Franklin, Fulton, Huntingdon, Juniata, Lancaster, Lebanon, Mifflin, Montour, Northern Centre, Northern Clinton, Northern Lycoming, Northumberland, Perry, Potter, Schuylkill, Snyder, Somerset, Southern Centre, Southern Clinton, Southern Lycoming, Sullivan, Tioga, Union and York. * WHEN. Through late tonight. * IMPACTS. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS. - Very heavy rainfall is expected today from numerous, slow- moving thunderstorms. The rain and already wet ground in many locations will cause smaller creeks and streams to flood quickly. - http://www.weather.gov/safety/flood

FFWLWX The National Weather Service in Sterling Virginia has issued a * Flash Flood Warning for. Northeastern Howard County in central Maryland. Southwestern Baltimore County in northern Maryland. Baltimore City in northern Maryland. * Until 415 PM EDT. * At 111 PM EDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1.5 and 3.5 inches of rain have fallen. The expected rainfall rate is 1 to 2 inches in 30 minutes. Additional rainfall amounts of 1 to 2 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD. Flash flooding caused by thunderstorms. SOURCE. Radar. IMPACT. Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include. Baltimore. Catonsville. Woodlawn. Milford Mill. Lochearn. Arbutus. Oella. Daniels. Woodstock.

FFWLWX The National Weather Service in Sterling Virginia has issued a * Flash Flood Warning for. Central District of Columbia. Prince Georges County in central Maryland. * Until 415 PM EDT. * At 108 PM EDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1.5 and 3 inches of rain have fallen. The expected rainfall rate is 1 to 2 inches in 30 minutes. Additional rainfall amounts of 1 to 2 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD. Flash flooding caused by thunderstorms. SOURCE. Radar. IMPACT. Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include. Bladensburg. Gallaudet University. Fort Totten. Howard University. Landover. Hyattsville. East Riverdale. Riverdale Park. Cheverly. Greater Landover. Chillum. Mount Rainier. Brentwood. University Park. Edmonston. Colmar Manor. Cottage City. North Brentwood. National Arboretum. Catholic University.