Annual Maximum Snow Water Equivalent: Historical

<hr /> <p> <span><strong>Deprecation Warning</strong>: On June 1 2026, this item will no longer be available. </span> For more information on transitioing layers visit: <a target='_blank' href='https://gis-kingcounty.opendata.arcgis.com/pages/inspect-gis-data-1' rel='nofollow ugc noopener noreferrer'>Update Deprecated Items | King County GIS Open Data</a> </p> <hr /><p> Historical Annual Maximum Snow Water Equivalent (SWE), a measure of the total amount of water contained in the snowpack. Results are shown only for watersheds with an average historical April 1st SWE of at least 0.4 inch. April 1st is the approximate current timing of peak annual snowpack in the mountains of the Northwest. Geographic units: HUC10. <br /></p><p>These data are part of a set that includes historical conditions (1970-1999, in inches) and the projected changes (in percent) for ten global models. Two time periods are considered: the 2040s (2030-2059) and the 2080s (2070-2099), based on a moderate greenhouse gas scenario (A1B). <br /></p><p><span style='font-style:italic;'>When rendered and displayed in Map Viewer (web map): </span>Data classes and symbology by Robert Norheim, Climate Impacts Group, based on the CMIP3 projections used in the IPCC 2007 report. </p><p>Data source: Hamlet et al. 2013.</p>