Research Article
The Role of Rossby-Wave Propagation in a North American Extreme Cold Event
Figure 7
Daily geopotential height (contours; m) and WAFs (vectors: >12 m2 s−2 only) of PWs 1 and 2 ((a1)–(a5)) and waves 1–4 ((b1)–(b5)) at 250 hPa in January 2014. Contour interval: 120 gpm.