* WHAT. Flash flooding caused by excessive rainfall continues to be possible. * WHERE. Portions of central, northeast, and northern Maryland, including the following areas, in central Maryland, Anne Arundel and Central and Southeast Howard. In northeast Maryland, Cecil. In northern Maryland, Northern Baltimore, Northwest Harford, Southeast Harford and Southern Baltimore. * WHEN. Until midnight EDT tonight. * 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. * ADDITIONAL DETAILS. - Thunderstorms producing 1 to 2 inch per hour rainfall rates continue to move across the area this evening. This may result in additional flash flooding. - Please visit www.weather.gov/safety/flood for flood safety and preparedness information

The affected areas were. Chesapeake Bay from Pooles Island to Sandy Point MD. Chester River to Queenstown MD. The thunderstorm has weakened and no longer poses a significant threat to boaters.

FFWLWX The National Weather Service in Sterling Virginia has issued a * Flash Flood Warning for. Central Howard County in central Maryland. East Central Montgomery County in central Maryland. * Until 1245 AM EDT. * At 936 PM EDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1 and 2.5 inches of rain have fallen. Additional rainfall amounts up to 1 inch 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. Columbia. Olney. Highland. Brookeville. Clarksville. Brinklow. Ashton. Sandy Spring.

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 1245 AM EDT. * At 948 PM EDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1 and 2 inches of rain have fallen. Additional rainfall amounts of 1 to 1.5 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. Baltimore. Columbia. Pikesville. Historic Ellicott City. Ellicott City. Catonsville. Woodlawn. Milford Mill. Lochearn. Arbutus. Ilchester. Oella. Daniels.

* WHAT. Flooding caused by excessive rainfall is expected. * WHERE. Portions of central and northern Maryland, including the following counties, in central Maryland, Anne Arundel and Howard. In northern Maryland, Baltimore and Baltimore City. * WHEN. Until 515 AM EDT Monday. * IMPACTS. Flooding of rivers, creeks, streams, and other low-lying and flood-prone locations is occurring. It will take several hours for all the water from these storms to work through local drainage systems. * ADDITIONAL DETAILS. - At 1111 PM EDT, Doppler radar indicated heavy rain due to thunderstorms. Flooding is already occurring in the warned area. Between 2 and 4 inches of rain have fallen. - Some locations that will experience flooding include. Baltimore. Columbia. Pikesville. Elkridge. Historic Ellicott City. Glen Burnie. Ellicott City. Towson. Catonsville. Woodlawn. Milford Mill. Lochearn. Arbutus. Ferndale. Brooklyn Park. Pumphrey. Ilchester. Linthicum. Lansdowne. - The Patapsco River at Elkridge may exceed minor flood stage shortly. - Please visit www.weather.gov/safety/flood for flood safety and preparedness information.