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Sharanya J. Majumdar, Kathryn J. Sellwood, Daniel Hodyss, Zoltan Toth, and Yucheng Song

order to improve 3–7-day forecasts of a winter cyclone that impacts North America, the question arises as to whether a platform may be able to sample continuously and cost effectively in propagating locations over the northern Pacific Ocean. This paper represents an initial attempt to identify and understand the properties of locations deemed optimal for adaptive sampling in this context. More specifically, we focus on the following question: If a high-impact weather event is anticipated over North

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Mio Matsueda, Masayuki Kyouda, Zoltan Toth, H. L. Tanaka, and Tadashi Tsuyuki

and blocking transition: A case study . Mon. Wea. Rev. , 120 , 1616 – 1627 . Langland , R. H. , 2005 : Observation impact during the North Atlantic TReC-2003 . Mon. Wea. Rev. , 133 , 2297 – 2309 . Langland , R. H. , and Coauthors , 1999 : The North Pacific Experiment (NORPEX-98): Targeted observations for improved North American weather forecasts . Bull. Amer. Meteor. Soc. , 80 , 1363 – 1384 . Lejenäs , H. , and H. Økland , 1983 : Characteristics of Northern Hemisphere

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John E. Janowiak, Peter Bauer, Wanqiu Wang, Phillip A. Arkin, and Jon Gottschalck

northwestern Atlantic and Pacific Oceans. This result is opposite of what Janowiak et al. (1998) discovered in an evaluation of the NCEP-1 reanalysis precipitation in which GPCP data were used as observations. Note that positive biases are also observed over most of Europe and over eastern and western North America with respect to CMORPH, but the bias over those regions is reduced substantially relative to GPCP. We place more confidence in GPCP over these regions since rain gauge data are included in the

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