Arizona to Face Flood Watch and Severe Storms

The National Weather Service warns of potential flash flooding and severe weather starting Wednesday night.

Updated on Oct. 20, 2026 in Forecasts

Heavy, dark storm clouds hang over an arid desert landscape in Arizona, with visible rain falling onto the valley floor. — The National Weather Service issued a flood watch for central and northern Arizona starting Wednesday evening due to an incoming low-pressure system. AI Illustration. Upload story photo >

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The National Weather Service has issued a flood watch for central and northern Arizona that begins at 8 p.m. Wednesday. The system is expected to persist through 5 p.m. Thursday, potentially bringing dangerous weather conditions to the state.

Why it matters

A low-pressure system moving from the California coast is combining with southern moisture to create widespread storm risks. These storms may train, leading to localized rainfall rates of 1 to 2 inches per hour.

Storms could produce wind gusts exceeding 60 mph across the region. Additionally, the Phoenix area faces a 5% chance of isolated tornado formation.

The players

National Weather Service

This is a federal agency tasked with providing weather forecasts, warnings, and data to protect life and property.

The details

The incoming weather system is expected to bring heavy rain and severe thunderstorms throughout the affected areas. While Arizona typically averages four to six tornadoes annually, usually measuring between 0 and 2 on the Enhanced Fujita Scale, residents are advised to prepare for potential disruptions.

Late Tuesday and early Wednesday: The Phoenix area has a 50% chance for rain.
Wednesday afternoon: The most impactful weather is expected to begin.
Wednesday 8 p.m. to Thursday 5 p.m.: A flood watch is in effect for central and northern Arizona.
Thursday morning: The period of most impactful weather is expected to conclude.

Seasonal Patterns

The National Weather Service uses the Enhanced Fujita Scale to classify tornado intensity in Arizona, following a pattern set by previous severe weather events. This system reflects the state's typical weather trajectory, where storms are usually confined to lower intensity ratings.

Residents should prepare for potential flash flooding and hazardous conditions caused by heavy rainfall. Monitor local weather updates and avoid driving through flooded areas while the flood watch remains in effect.

The takeaway

Arizona residents should remain alert for rapid changes in weather conditions as this system develops. It is recommended to secure outdoor items against high wind gusts and monitor local alerts through Thursday afternoon.