April 1st Snow Water Equivalent: All Scenarios

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<hr /><p> Historical and projected changes in the April 1st Snow Water Equivalent (SWE), a measure of the total amount of water contained in the snowpack. April 1st is the approximate current timing of peak annual snowpack in the mountains of the Northwest. Results are shown only for watersheds with an average historical April 1st SWE of at least 0.4 inch. Geographic units: HUC10. <br /></p><p>These data include 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>Data source: Hamlet et al. 2013.</p>