Human-Machine Interface; Situational Awareness
Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew FLC complied w / Automation / Advisory; Flight Crew Took Evasive Action
Aircraft; Human Factors
I was flying the River Visual Approach to RWY 19 at DCA; [when approximately] 4 NM from landing; we got a GPWS 'Obstacle; Obstacle' warning. I was scanning outside and inside the cockpit and did not feel we were near any obstacles that would trigger a GPWS warning. I did look down and notice that I was slightly below the advisory VNAV 'snowflake.' Captain took the controls and made a slight correction to the glidepath and course. GPWS warning went away and we landed uneventfully.On the River Visual approach to RWY 19; we fly very close to some buildings as we come down the Potomac River. It may have been a combination of being close to buildings; being slightly below the VPA snowflake; and having a momentary sink rate greater than normal that triggered the GWPS warning.
CRJ200 First Officer reports receiving a GPWS 'Obstacle; Obstacle' warning during the River Visual Approach to Runway 19 at DCA. The warning occurred at 4 NM with the aircraft slightly below the recommended altitude and at a higher than normal sink rate. The Captain took the controls and made a slight adjustment stopping the warning.