Figure 1. Simultaneous correlation between SSTA at each grid point and SSTA anomalie s averaged over the box (180-140 W, 30-40 N) for (a) JFM, (b) April and May, (c)June and July and (d) August and September. Contour interval 0.1. Areas where positive (negative) correlations are significant at the 95% level are light (dark) shaded.

Figure 2. 200 hPa Streamfunction

Figure 2. 200 hPa streamfunction (with zonal mean removed) difference between wet and dry SW winter events for (a) JFM, (b)April and May, (c) June and July and (d) August and September. Contour interval 1xE+06 m2/s. Ares where positive (negative) values are statistically significant at the 95% level are dark (light) shaded.

Figure 3. 200 hPa divergence (shaded) and divergent wind (vector) difference between wet and dry SW cases for (a) January, February and March and (b) June and July averages. Divergence contour interval is 0.5E-06 /s.