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Joseph P. Zagrodnik, Lynn McMurdie, and Robert Conrick

. 1981 ). Atmospheric conditions favoring enhanced precipitation over terrain included warm sectors with low-level jets of at least 20 m s −1 (i.e., atmospheric rivers) and upwind “seeder” precipitation of at least 0.5 mm h −1 ( Nash and Browning 1977 ; Hill et al. 1981 ; Richard et al. 1987 ). A commonly held assumption of the seeder–feeder framework is that the lower-level warm processes are inefficient because of slow autoconversion rates between cloud and rainwater. Several studies over the

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Aaron R. Naeger, Brian A. Colle, Na Zhou, and Andrew Molthan

relatively strong low-level moist flow impinging upon the Olympic Mountains that promoted large windward rain accumulations. At 0000 UTC 13 November ( Fig. 1b ), the GFS reanalysis showed a 700-hPa trough was over the Gulf of Alaska, along with a plume of moisture (RH > 90%) from the central Pacific to the Pacific Northwest. At lower levels a950-hPa southwesterly jet (25 m s −1 ) associated with a warm front was advecting the warm, moist air toward the coast ( Fig. 2a ). The warm front propagated over

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