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  • Madden-Julian oscillation x
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Alex C. Ruane and John O. Roads

resolution, identifying significant regions of activity across many variance categories between 6-h and 1-yr periods. In addition to a considerable land–sea contrast, signatures of the Hadley circulation, major monsoons, diurnal circulations, and the Madden–Julian oscillation (MJO; Madden and Julian 1994 ) were present in the three satellite-derived precipitation products and the two reanalysis models. To further explore the role of these and other features in the water cycle, this study compliments RR

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R. E. Carbone and J. D. Tuttle

applications. We report new results at the continental scale and we delve into some regional aspects of diurnal variability that were not previously examined. Finally, we search for evidence of diurnal anomalies that might occur during phases of El Niño–Southern Oscillation (ENSO; Madden and Julian 1972 ). Pioneering work by Tripoli and Cotton (1989a , b ) established a causal relationship between propagating mesoscale convective systems over the Great Plains and diurnal forcing over the Rockies, which

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