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Sam Hardy, David M. Schultz, and Geraint Vaughan

km or less [ Battalio and Dyer (2017) and references therein]. The results from these calculations are discussed in more detail in sections 4 – 6 . 3. Synoptic overview The synoptic evolution of this event is documented using the GFS 0.5° analyses previously described in section 2 , complemented with the Met Office radar product ( Met Office 2009 ), a 1-km horizontal grid-spacing composite constant-altitude plan position indicator (CAPPI) at 1-km elevation. a. Cyclone interaction with upper

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Ben Harvey, John Methven, Chloe Eagle, and Humphrey Lean

exact circuit integral expressions. Assuming that the flight track is parallel to the front along the segments CD and EF, which was the aim of the flight plan but cannot be verified exactly, these bulk estimates of vorticity and divergence take the form and respectively, where d is the distance between the middle of the alongfront segments CD and EF, and the overbars indicate averages along the flight segments indicated. The similarity with the exact contour integral expressions (5) and (6) is

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Geraint Vaughan, Bogdan Antonescu, David M. Schultz, and Christopher Dearden

aircraft took off at 0843 UTC from Cranfield, north of London, and headed westward to Ireland ( Fig. 9 ). The plan was to launch a series of Vaisala RD94 dropsondes across the convective rainband along 52.5°N, beginning at the edge of Irish airspace at 5.5°W (permission to drop sondes on the British side of the Irish Sea was denied). Nine dropsondes were released, one every 4 min (about 33 km apart) between 0938 and 1010 UTC. Fig . 9. The track, colored according to altitude (km), of the FAAM BAe-146

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