Storm Drenches Southern Arizona With Record Rainfall

Three straight days of record totals hit the region, but experts say the rain will do little to fix long-term groundwater losses.

Updated on Nov. 3, 2026 in Current Conditions

Flat-color editorial illustration of a thin band of floodwater in a dry desert wash beneath a distant mountain ridge and clearing storm sky. — Three straight days of record rain hit southern Arizona, but aquifers recharge far more slowly than they are pumped, experts say. AI Illustration. Upload story photo >

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A storm brought record rainfall and historic flooding across southern Arizona, with totals breaking records three days in a row. Rain flowing from the mountain front renewed shallow groundwater, while water levels at Lake Powell rose 14 feet after the recent storms.

Why it matters

Arizona's water supply depends heavily on aquifers, which are being pumped for human use faster than they recharge. Only about 3% of the state's annual rainfall reaches aquifers, so a single storm does little to offset long-term depletion.

Lake Powell has risen 14 feet after recent storms but remains 15 feet below where it needs to be, while Tucson's groundwater sits more than 100 feet deep in some areas. Only 3% of Arizona's annual rainfall reaches the aquifers, and the source does not state how quickly levels will recover.

The players

Central Arizona Project

The Central Arizona Project is a major water conveyance system that delivers Colorado River water to central and southern Arizona.

The details

Rain from the storm flowed in rivers at the mountain front, renewing shallow groundwater, though Tucson's aquifer is pumped for human use faster than it recharges. The city recharges wastewater back into the aquifer, but experts say two inches of rain would take decades to hundreds of years to refill central Tucson's aquifer.

Storm brought record rainfall and flooding to southern Arizona this weekend, late October/early November 2026.
No more rain is expected for the rest of the week.

Seasonal Patterns

The storm's record rainfall offers only brief relief against the 27-year Colorado River drought deficit that has drawn down reservoirs and aquifers across the region. Recovery from the drought will require repeated wet periods, and the Central Arizona Project hopes a wet El Niño will bring additional rain to Colorado River basins.

Residents should be aware that no more rain is expected for the rest of the week after this storm. Flooded roads and waterways may remain hazardous, so drivers should avoid crossing standing water in southern Arizona.

The takeaway

A single record storm cannot undo years of groundwater overuse, so long-term conservation and repeated wet periods remain essential for Arizona's water future.