Correlation between the TPW plume, short wave #1, and precipitation development becomes evident during this period as short wave #1 moves across the CWA. Despite the steady increase in TPW from west to east, precipitation across western Washington gradually diminishes for a time in response to downward forcing behind short wave #1. Over the eastern CWA, interaction between upward forcing out ahead of short wave #1 and the increase in TPW results in a brief period of light orographic snows. The more significant precipitation expected with the stronger short wave #2 has yet to impact the region. Short wave #2, however, is poised just off the northwest Washington coast by the end of the period.