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

Figure 1

Composited 2-m surface temperature anomalies (shading; K) in January 2014 relative to the 30-year climatology: (a) composition for 1–15 January; (b) composition for 21–29 January. The 30-year climatology refers to the 30-year average of January in 1981–2010.

(a) 1–15 Jan anomaly

(b) 21–29 Jan anomaly