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

we shall give a brief outline of the tracking method used. See Hewson and Titley (2010) for a full description of the objective feature identification and tracking methodology. The tracking algorithm aims to identify and track developing cyclonic storms through their entire life cycle from small kinks in fronts (labeled diminutive frontal waves) through developed frontal waves to closed low pressure centers (labeled barotropic lows). The algorithm uses a hybrid of objective fronts, pressure

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David M. Schultz and Joseph M. Sienkiewicz

) described this process as “a result of snow evaporating rapidly, which in turn quickly cools the surrounding air. This cooler, denser air then descends, transferring momentum to the ground.” However, mesoscale modeling studies of both real cyclones and idealized baroclinic waves in which evaporative cooling is turned off do not yield stronger surface winds (T. Baker and P. Knippertz 2012, personal communication; Baker et al. 2013a ; Smart and Browning 2013 ). Although evaporation may be occurring

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