Tucson, Arizona – While rainfall across parts of Arizona and the southwestern United States has been near or even above normal since October, mountain snowpack levels remain well below average, raising concerns for long-term water supply.
According to the National Weather Service office in Tucson, Water Year precipitation totals through early February show much of southern and central Arizona receiving near-normal rainfall. Some areas have even exceeded seasonal averages, particularly across lower elevations and desert locations.
However, Snow Water Equivalent measurements tell a different story. Snowpack across much of Arizona, New Mexico, and portions of the Four Corners region is running significantly below normal, with many basins measuring between 30% and 60% of average for early February. Higher-elevation areas that typically contribute to spring runoff remain especially deficient.
This contrast highlights the difference between rainfall and snowpack impacts. While rain can temporarily improve soil moisture and short-term conditions, mountain snowpack is critical for sustained river flows and reservoir replenishment later in the year.
Major transportation corridors including Interstate 10, Interstate 17, Interstate 40, and Interstate 8 pass near key watershed areas that rely heavily on winter snow accumulation. Reduced snowpack can affect water availability for communities, agriculture, and ecosystems well beyond the winter season.
The National Weather Service notes that continued storms later in the winter could still improve snowpack levels, but time is becoming a limiting factor as the season progresses. Forecasters emphasize that snowpack recovery typically requires multiple cold, snow-producing systems rather than rain-dominated events.
While no immediate travel or weather hazards are associated with this outlook, the long-term implications are significant for regional water planning. Residents are encouraged to stay informed as winter progresses and water supply outlooks are updated heading into spring.
