* WHAT. Flash flooding caused by excessive rainfall continues to be possible. * WHERE. Portions of northeast and northern Maryland, including the following areas, in northeast Maryland, Cecil. In northern Maryland, Northern Baltimore, Northwest Harford, Southeast Harford and Southern Baltimore. * WHEN. Until 4 AM EDT Wednesday. * IMPACTS. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS. - Recent heavy rainfall has significantly lowered flash flood guidance in northeast Maryland in recent days, including several inches today in isolated spots. More torrential rainfall is possible this afternoon as multiple mesoscale convective complexes push through, which may result in flash flooding. Generally, most places will get another inch or so form this, but isolated spots where training occurs could see 2 to 3 inches of rainfall in a relatively short period of time. - Please visit www.weather.gov/safety/flood for flood safety and preparedness information

* WHAT. Flooding caused by excessive rainfall is expected. * WHERE. Portions of north central and northern Maryland, including the following counties, in north central Maryland, Carroll. In northern Maryland, Baltimore and Harford. * WHEN. Until 400 AM EDT. * IMPACTS. Minor flooding of creeks, streams, and other low-lying and flood-prone locations is imminent or occurring. * ADDITIONAL DETAILS. - At 1201 AM EDT, Doppler radar indicated heavy rain due to thunderstorms. Flooding is ongoing or expected to begin shortly in the warned area. Between 0.5 and 1.5 inches of rain have fallen in the past hour, with localized totals up to 2.5 inches since 8 PM Tuesday evening. - Additional rainfall amounts up to 1 inch are possible in the warned area. - Some locations that will experience flooding include. Fallston. Hampstead. Manchester. Jarrettsville. Pylesville. Parkton. Hereford. Monkton. Bentley Springs. Glencoe. Sparks. Freeland. Maryland Line. Butler. Norrisville. Boring. Upperco. Millers. Greenmount. Chrome Hill. - Please visit www.weather.gov/safety/flood for flood safety and preparedness information.