Feb 7, 2017
This video does a good job showing the differences in frames of reference and fictitious fores.
The coriolis effect is a fictitious force that only makes sense/appears if you are in the non-inertial reference frame. If you are the observer, then you do not see the coriolis effect, as it can be explain through the motion of the moving non-inertial reference frame.
In this video, the moving platform is the non-inertial reference frame, and the ground outside is the frame in which the observer stands. The observer is in an inertial reference frame.