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Sam Hardy, David M. Schultz, and Geraint Vaughan

the United Kingdom ( Mark 2013 ). Although most major winter floods in the United Kingdom are connected to persistent orographically enhanced precipitation caused by atmospheric rivers (e.g., Lavers et al. 2011 , 2012 ; Champion et al. 2015 ), frontal systems associated with slow-moving summer and autumn cyclones also cause U.K. precipitation extremes, with heavy rainfall often caused by slow-moving frontal rainbands to the northwest of the cyclone center ( Hand et al. 2004 ). The importance of

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

to the upper part of the vertical section ( Fig. 3a ). In this case, exhibits maximum intensity ( ) toward the section’s northern edge ( Fig. 3c ). This flux produces a water vapor mass flow with a westward component across the vertical curtain below 7 km of . This value is comparable in magnitude to the typical meridional water vapor mass flow in a Northern Hemisphere atmospheric river ( Zhu and Newell 1998 ). Figure 3 also shows vertical sections for model-derived variables through

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