A heavy snow warning has been issued for the Washington D.C. area, forecasting up to 6 inches of snow and highlighting potential hazardous conditions such as reduced visibility and difficult travel. The National Weather Service advises residents to prepare for significant snowfall impacting daily activities and travel plans, with snow expected to begin in the evening and continue through the night, potentially affecting the morning commute. Residents are urged to stay informed and take necessary precautions to ensure safety.