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Robert Conrick and Clifford F. Mass

configuration and GPM data a. Model configuration During OLYMPEX, operational forecasts were produced at the University of Washington using the WRF ( Skamarock et al. 2008 ) Model, version 3.7.1. As in Conrick and Mass (2018, manuscript submitted to J. Hydrometeor. ), we use archived WRF forecasts, valid every 6 h from 0600 to 2400 UTC and initialized daily at 0000 UTC, for the period from 1 November 2015 to 1 February 2016. A 36–12–4–1.33-km domain configuration was utilized with 38 vertical levels, with

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Joseph P. Zagrodnik, Lynn A. McMurdie, Robert A. Houze Jr., and Simone Tanelli

lee side is very dry ( Fig. 1 ). In a recent study using OLYMPEX data, Purnell and Kirshbaum (2018 , hereafter PK18 ) used rain gauges and operational National Weather Service radars to show that orographic precipitation distributions are highly sensitive to the upstream static stability, horizontal moisture flux, and the presence of preexisting precipitation associated with the large-scale synoptic storm sectors. McMurdie et al. (2018) found that when the large-scale conditions resembled warm

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