Hurricane Priscilla Triggers Flood Threat in Southwest

PIMA COUNTY, Ariz. (AP) — A significant flood threat looms for the Southwest as the remnants of Hurricane Priscilla interact with another storm system this week. More than a month’s worth of rain could hit some of the driest regions in the United States.

Forecasters expect this moisture to create a long-lasting rainfall event, with some areas seeing over an average October’s rain by the end of the week. Rainfall amounts could peak late Friday into Saturday, with another tropical system predicted to follow early next week.

Priscilla, now downgraded to a tropical storm, will dissipate near Baja California, Mexico. However, its abundant moisture is forecasted to merge with a weather system moving down the West Coast, a pattern that historically brings Eastern Pacific hurricane remnants into the Southwest.

The National Weather Service warns that rainfall could begin as early as Thursday, especially across Arizona and southeastern California, with the heaviest downpours expected on Friday and Saturday.

Areas prone to flooding, such as low-lying regions and slot canyons, are particularly at risk. Rainfall totals may exceed what is typically seen in October. For instance, Phoenix could surpass its average of half an inch in just days.

“Two inches of rain fell in just 30 minutes during a storm last month, causing severe flash floods,” said meteorologists. “With rainfall rates expected to be similar this week, residents should prepare for possible flooding and hazardous conditions.”

Pima County is taking precautions by opening several sandbag stations ahead of the forecasted storm. Residents can collect up to 20 sandbags each to fortify their properties. Locations include the East Parking Lot of Hi Corbett Field in Tucson.

Residents are advised to sign up for emergency weather alerts and monitor conditions closely as the storm approaches. Meteorologists emphasize that while rain is welcomed, many areas remain under severe drought, making the ground unprepared for rapid runoff.