Heavy rains have caused significant flash flooding across the Washington D.C. metro area, particularly affecting northern D.C. and Montgomery County. Roads have transformed into muddy rivers, stranding numerous drivers and prompting emergency rescues. Over 20 people were rescued from buildings and vehicles, with firefighters actively conducting operations to reach those trapped by rising waters. A Flash Flood Emergency has been declared, urging residents to avoid travel and heed warnings as cleanup efforts begin. Authorities remain on alert as additional severe weather is anticipated in the coming days.