Key Points

• Substantial snow water equivalent (SWE) deficits emerged across areas in the Rocky Mountains, where above-average temperatures and drought persisted into the new water year.
• Snow drought is most prevalent across Wyoming, Arizona, New Mexico, and southwest Montana. Low precipitation is driving snow drought across these states. 
• An active weather pattern across the Cascade Range and Sierra Nevada in November buffered snowpack conditions despite a recent multi-week dry spell. 
• Temperature will play a key role in snow drought development. Current National Weather Service outlooks favor above-normal temperatures for all of the western states through December. 
• Early season snow drought conditions can change rapidly, especially at lower elevations with increased variability in weather patterns during late fall and early winter. Early in the season, snow drought recovery can be rapid. Recovery from snow drought in late winter and early spring, when snowpack is typically near peak, can be slower. 

The rest of this snow drought update is available at: https://www.drought.gov/drought-status-updates/snow-drought-current-conditions-and-impacts-west-2024-12-11