The statement: "Figure 3 illustrates the middle-atmosphere pressure pattern" is incorrect. Figure 3 shows the *height* field pattern at 500-mb. This is an important distinction, since the entire figure is in the frame of reference of all pressures being equal to 500 mb. Besides making this correction, a future topic could explain in layman's terms the difference between the surface (where pressure is used due to the fixed reference of the ground), and height fields, where the pressure is the fixed reference, and how the various oscillations are more (or less) detectable in one reference or the other, or how something like ENSO might be detected first in the surface pressure, where something like NAO might first be detected in the 500-mb height field, and how knowledge of the leads/lags is applied to seasonal predictions.