This work was funded by the National Science Foundation (Grant EAR-0908558).
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There are small cosmetic differences in data between CG11 and this reply that do not affect any physical interpretation but that should be mentioned. First, we have used different temporal filters. Second, CG11 identified the 10 “strong winter seeding” and 10 “weak fall/spring seeding” months in the 23-yr ERA-40 dataset, 1979–2001. In this reply we show results from the same dataset but include 43 years, 1959–2001. To represent the same fraction of the data, we identify 19 strong winter seeding and 19 weak fall/spring seeding months, instead of 10, in Fig. 1b.