The Role of Rossby-Wave Propagation in a North American Extreme Cold Event

<div>Daily geopotential height (contours; gpm) and its anomalies (shading; gpm) at 500 hPa in January 2014 relative to the 30-year climatology. The 30-year climatology refers to the 30-year average of January in 1981–2010. Contour interval: 100 gpm.</div>

Advances in Meteorology

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Figure 2

Figure 2: The Role of Rossby-Wave Propagation in a North American Extreme Cold Event 