the winter, but weakens
and spreads northeast during the summer. The highest wintertime precipitation occurs southwest
10
Figure 3. Seasonal mean fields in winter ((a) and (
c)) and summer ((b) and (d)). (a) and
(b): daily precipitation (coloured contours), 500 hPa geopotential height in metres (red
contour lines), and 250 hPa geopotential height (white contour lines). (
c) and (d): sea
surface temperature
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