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Thomas H. A. Frame, John Methven, Nigel M. Roberts, and Helen A. Titley

. APPENDIX Impact of Stochastic Parameterizations Starting in April 2012 MOGREPS-15 was constructed from one unperturbed control member without stochastic parameterizations, 22 perturbed members with stochastic parameterizations, and one unperturbed member with stochastic parameterizations. This configuration provides a convenient means of determining whether stochastic parameterization is the cause of differences in the statistics of cyclonic features between the control and perturbed members described

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Oscar Martínez-Alvarado, Laura H. Baker, Suzanne L. Gray, John Methven, and Robert S. Plant

Structures in Extratropical Storms (DIAMET) project. The storm has been the subject of extensive investigation involving not only the present article. Baker et al. (2013) described the flights and summarized the severe societal impacts of the storm. Vaughan et al. (2014, manuscript submitted to Bull. Amer. Meteor. Soc. ) give more details of the DIAMET experiment and present the results of research on high-resolution ensemble simulations and further in situ aircraft observations, as well as

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Oscar Martínez-Alvarado, Suzanne L. Gray, and John Methven

Kingdom, northern Europe, and Scandinavia. Heavy precipitation can have an important societal impact, as it can lead to extreme weather events, such as flash flooding. Water vapor condensation in the rising air also releases latent heat, which typically intensifies the ascending motion and the cyclone near the surface (e.g., Tracton 1973 ; Davis 1992 ; Stoelinga 1996 ; Ahmadi-Givi et al. 2004 ; Grams et al. 2011 ). For example, studying a cyclone that reached its maximum intensity (based on mean

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