(a)–(d) show the difference in climatological mean (1979–2001) potential temperature (K) and horizontal wind speed (m s−1) at 925 hPa between A1.3 and A1.1 at 0800, 1400, 2000, and 0200 AWST, respectively. (e)–(h) show the difference in potential temperature and horizontal wind speed at 125°E between A1.3 and A1.1 at 0800, 1400, 2000, and 0200 AWST, respectively. The colored contours show the difference in potential temperature. The meridional and vertical wind speeds are indicated by the arrows (scale under each figure) and the zonal wind speeds are shown as the black contours. The dotted and solid black lines represent the zonal flow into and out of the page, respectively. The vertical component is multiplied by a factor of 100 to make it visible.