Weather
Flagstaff, AZ Weather Alert: Flood Risk Rises Oct. 30–Nov. 1
Flagstaff, AZ — A developing series of Pacific storm systems could bring widespread rainfall, isolated thunderstorms and an increasing flooding risk across northern Arizona from Friday, Oct. 30, throu
By Mason Reid · 2026-10-28T11:16:53.840Z
Flagstaff, AZ — A developing series of Pacific storm systems could bring widespread rainfall, isolated thunderstorms and an increasing flooding risk across northern Arizona from Friday, Oct. 30, through Sunday, Nov. 1, with the most significant weather potentially arriving Sunday.
According to the National Weather Service in Flagstaff, dry conditions and seasonable temperatures will continue through Thursday before Pacific storm systems begin drawing tropical moisture into Arizona on Friday.
Widespread showers and isolated thunderstorms are expected Friday , bringing a notable change from the region's recent dry weather.
Forecast rain probabilities are elevated across much of northern Arizona, with several communities facing a greater than 50% chance of precipitation.
The National Weather Service forecast graphic indicates rain chances near 81% around Flagstaff, with elevated probabilities also extending into portions of Yavapai, Coconino, Navajo and Apache counties.
Communities including Flagstaff, Williams, Sedona, Prescott and Payson could experience periods of rainfall as moisture spreads across the region.
Flooding Risk Could Peak Sunday
Forecasters expect shower chances to decrease somewhat Saturday, Oct. 31, potentially providing a temporary break in the unsettled weather.
However, a more significant storm system could arrive Sunday, Nov. 1, bringing renewed rainfall and the possibility of stronger thunderstorms.
The National Weather Service specifically warns that flooding concerns will increase beginning Friday and could peak Sunday.
Heavy rainfall could create hazardous conditions along low water crossings, washes and flood prone roadways, particularly where runoff develops quickly.
Drivers traveling along Interstate 17, Interstate 40 and other northern Arizona highways should monitor forecasts for changing road conditions.
Residents planning Halloween activities Saturday should also prepare for unsettled weather, even as shower chances temporarily diminish.
Forecasters emphasize that the strength and impacts of Sunday's system remain subject to change.
Residents should monitor updated National Weather Service forecasts and avoid driving through flooded roadways.
For official weather information, visit weather.gov/fgz.