Interannual Variability of Northern Hemisphere Storm Tracks in Coarse-Gridded Datasets

Figure 6

Partial correlation coefficient for JFM cyclone frequency versus PNA (excluding ENSO and NAO). Correlation (shaded). 2-tailed 90% significance (hatched) for (a) NCEP1_5801, (b) ERA40_5801, (c) NCEP1_7910, and (d) NCEP1_5078.

(a)

(b)

(c)

(d)