Ten days ago, snow-water-equivalent (SWE) in the Upper Henry’s Fork subwatershed was 89% of the 30-year median. As forecast 10 days ago, storms over the past few days have favored the northern part of the watershed for a change, raising the Upper Henry’s Fork SWE to 99% of median. SWE is 121% of median in the Fall River subwatershed (up from 113% nine days ago) and 130% of median in the Teton River subwatersed (up from 123% nine days ago). Forecast calls for four more days of wet weather, followed by a week-long dry period.

Graph of snow water equivalent as a percent of median.

Graph above shows percent-of-median SWE since November 1 in the three subwatersheds of the Henry’s Fork watershed. Also shown is the percent-of-median SWE for the Henry’s Fork and Teton Basins, as reported in the Natural Resources Conservation Service (NRCS) daily snow/precipitation report. Table below shows data for individual sites, as well as the subwatersheds and the NRCS Henry’s Fork and Teton Basins index. If you would like to receive daily updates of this graph and table via email, send a message to Rob at rob@henrysfork.org with “SWE request” in the subject line.

Table of daily snow water equivalent data.

To see how we use raw data from the NRCS SnoTel website to calculate the numbers in the graph and table above, download our SWE methods document. Go to the NRCS interactive map for a great visualization of very high snowpack across the central and southern part of the western United States but below-average snowpack in Montana, north Idaho, and Washington. The upper Henry’s Fork watershed sits at the transition between above-average snowpack to our south and below-average to our north. Today’s version of this map is shown here.

Map of western US showing SnoTel sites and today's SWE as percent of median.