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Jana Čampa and Heini Wernli

distributed over the whole cyclone area. Field and Wood (2007) composited cyclones according to their intensity (in terms of surface wind speed) and moisture content. They show that for cyclones of the same wind speed intensity, those with more moisture have a slightly higher sea level pressure (SLP) than the drier ones. Therefore the dynamical effect of precipitation processes is also to produce stronger winds in the cyclones that do not have very low SLP. Rudeva and Gulev (2011) found similar

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Olivia Martius and Heini Wernli

.g., sea surface temperatures) on the synoptic variability. In the literature, a distinction is often made between two types of upper-level jet streams: eddy-driven jets and subtropical jets (e.g., Reiter and Whitney 1969 ; Lee and Kim 2003 ). Koch et al. (2006) proposed an alternative jet stream typology with two categories of shallow and deep jets based on the depth of the baroclinic zone associated with the jet. Eddy-driven (“deep”) jets are sustained primarily by baroclinic eddies and they can

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Michael Riemer, Marlene Baumgart, and Sven Eiermann

location of the cyclone was small. The downstream cyclone affected the British Isles with widespread precipitation of 10–20 mm and a maximum of 50 mm in Wales. Subsequently, the downstream trough developed into a potential vorticity streamer that triggered heavy precipitation in the Mediterranean Sea. 2) Continued modification by amplified jet streak Cyclogenesis downstream of Hanna (from 1200 UTC 8 September to 1200 UTC 9 September; see Figs. 7a,b , 6a , and 7c,d , respectively) is associated with

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