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The Rain-on-snow coverage was created as a screening tool to identify forest practice applications that may be in a significant rain-on-snow zone (WAC 222-22-100).
Description
ROS is a statewide coverage of rain-on-snow zones. Rain-on-snow zones are based on average amounts of snow on the ground in early January, relative to the amount of snow that could reasonably be melted during a model storm event. Five ROS zones are defined in Washington State and are based on climate, elevation, latitude, and vegetation. ROS was digitized from 1:250,000 USGS quads. |