This talk focuses the dynamical linkage between the meridional mass circulation and cold air outbreaks. It is found that the onset date of continental-scale cold air outbreaks coincides well with the peak time of stronger meridional mass circulation event. During weaker mass circulation events, most areas of the midlatitudes are generally in mild conditions except the northern part of western Europe. Composite patterns of circulation anomalies during stronger mass circulation events greatly resemble that of the winter mean, with the two main routes of anomalous cold air outbreaks being along the climatological routes of polar cold air: namely, via East Asia and North America. The Siberian high shifts westward during stronger mass circulation events, opening up a third route of cold air outbreaks through eastern Europe, where lies the poleward warm air route in the winter-mean condition. The strengthening of the Icelandic low and Azores high during stronger mass circulation events acts to close off the climatological-mean cold air route via western Europe; this is responsible for the comparatively normal temperature there. The composite pattern for weaker mass circulation events is generally reversed, where the weakening of the Icelandic low and Azores high, corresponding to the negative phase of the NAO, leads to the reopening and strengthening of the equatorward cold air route through western Europe, which is responsible for the cold anomalies there.