Western snowpack warning
- Multiple reports show a generally poor snowpack across the U.S. West, despite a late‑April storm window. (opensnow.com) - Colorado saw calls for more cloud seeding after a record‑low winter, and Idaho faces likely spring‑summer water problems. (ouraynews.com, rexburgstandardjournal.com) - Vancouver Island researchers warn the low snowpack will probably stress salmon populations already under pressure. (cbc.ca)
The West is heading into spring runoff with snowpack at or near record lows in many basins, even after late-April storms. Snowpack is the mountain snow that acts like a natural reservoir, storing winter water and releasing it as it melts. The U.S. Department of Agriculture said April 1, the usual benchmark for peak accumulation, came in at or near record-low levels across the western United States in 2026. A federal drought update on April 9 said Arizona, Colorado, Idaho, Nevada, New Mexico, Oregon, Utah and Wyoming all posted new record-low April 1 snow-water-equivalent values in the SNOTEL era. California logged its second-lowest April 1 value, and many Colorado River Basin runoff forecasts fell below 30% of average. Colorado has become one of the clearest examples. The Natural Resources Conservation Service said statewide snow water equivalent was 56% of median on Jan. 1, and the Colorado Climate Center’s April 1 outlook put the statewide figure near 22% of the historic median for that date. That shortfall has revived interest in cloud seeding, a weather-modification practice that disperses silver iodide into suitable clouds to try to squeeze out more snow. Colorado’s program told The Ouray News that inquiries increased after the state’s record-low winter snowpack. Idaho’s water outlook is also deteriorating early. The Natural Resources Conservation Service said on April 8 that Idaho’s snowpack peaked nearly three weeks early, on March 17, and was among the lowest on record since measurements began in the 1930s. The Idaho Snow Survey program says those measurements feed forecasts used by irrigators, fish and wildlife managers, and water agencies planning for spring and summer runoff. By April 20, basin-level snowpack in parts of Idaho remained far below typical peak values, even where some northern stations were closer to normal. British Columbia shows how a decent provincial average can hide local stress. The province’s April 1 bulletin put the overall snowpack at 92% of normal, but Vancouver Island was only 44% of normal. Researchers told CBC that low Vancouver Island snowpack is likely to add pressure on salmon already dealing with habitat degradation, overfishing and warmer water. Smaller snowpacks usually mean lower, warmer streams later in the season, conditions that can squeeze fish during migration and spawning. Forecasters are still watching for late storms, but April is already the point when western water managers start converting snow measurements into runoff expectations. In 2026, those expectations are unusually weak across much of the West, and the next updates will show whether late-season snow can narrow a deficit that is already historically deep.
