Figures 1-27 show mean daily surface level pressure, 500 hPa and 700 hPa charts for each of the Lamb atmospheric circulation patterns. The contours are drawn at increments of 2 hPa, in the case of surface level pressure charts, and in increments of 5m in the case of 500 hPa and 700 hPa height charts. Lamb circulation patterns can be divided into three groups: Anticyclonic, Directional and Anticyclonic.