Tucson to Face Flash Flood Watch Wednesday and Thursday
The National Weather Service issued a two-day watch for the Tucson area due to the threat of heavy rainfall.
Updated on Oct. 20, 2026 in Forecasts
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The National Weather Service has issued a Flash Flood Watch for the Tucson area effective throughout Wednesday and Thursday. Severe thunderstorms are expected to create localized rainfall rates ranging from one to two inches per hour.
Why it matters
The watch is triggered by the risk of severe thunderstorms and potential flash flooding throughout the region. Officials are monitoring conditions that may lead to upgraded risk levels over the next 48 hours.
Localized rainfall rates are projected at one to two inches per hour during the event. Thursday's forecast currently includes an 80 percent chance of precipitation and maximum wind gusts of 23 mph.
The players
National Weather Service
The National Weather Service is a federal agency tasked with providing weather, water, and climate data, forecasts, and warnings for the protection of life and property.
Storm Prediction Center
The Storm Prediction Center is part of the National Weather Service that provides forecasts and watches for severe thunderstorms and tornadoes across the United States.
The details
Areas north and northeast of Tucson face a slight risk for severe thunderstorms and flash flooding as designated by the Storm Prediction Center and the Excessive Rainfall Outlook. While increased cloud cover may help dampen the severe thunderstorm threat on Thursday, persistent heavy rain remains a primary concern for the area.
Timeline
A Flash Flood Watch is active throughout Wednesday and Thursday.
Precipitation chances will reach 80 percent on Thursday.
Severe risk levels may be upgraded over the next 48 hours.
Seasonal Patterns
This event follows the standard designation protocols set by the National Weather Service's Excessive Rainfall Outlook thresholds to alert the public to localized flood threats. The current forecast aligns with historical patterns of severe storm frequency observed during active weather windows in this region.
Residents should remain alert for rapid changes in water levels, particularly in low-lying areas prone to flooding. Drivers are advised to avoid flooded roadways and monitor updated forecasts as severe risk levels could be upgraded over the next 48 hours.
The takeaway
Flash flooding can develop rapidly, making it essential for residents to stay informed through official channels during the watch period. Preparing emergency supplies and identifying higher ground in flood-prone areas are recommended precautions during heavy rain events.
Further reading
Find more local updates on the Tucson Forecasts page.
Source note: This article includes information reported by Kold.
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