The lead author thanks Dr. Lydia Stefanova for helpful discussion about physical results and Dr. Timothy Eichler for providing insight into spring storm tracks. Thanks are given to Mr. David Zierden for the use of the monthly ENSO index and to Ms. Kathy Fearon for her invaluable reviews and editing suggestions. The authors also thank the FAWN and ECONet database and project managers for sharing the data from their agricultural stations. This research was supported by the NOAA Applied Research Center Grant NA06OAR4310070 and USDA National Institute of Food and Agriculture (NIFA) Grant 2011-67003-30347.
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