30-day loop of analyzed 500-hPa
heights and anomalies. Each frame is an five-day mean, centered on the date indicated in
the title, of 500-hPa heights and anomalies from the NCEP Climate Data Assimilation System
(CDAS). Contour interval for heights is 120 m, anomalies are indicated by shading.
Anomalies are departures from the 1981-2010 daily base period means.