Science & Nature

We’ve got a few more hours of Rosa’s rains, then … what’s that? … sunshine tomorrow? And you can say goodbye to triple digits. But first, one more Flash Flood Warning was issued by the National Weather Service this morning.

Just as predicted six days ago, it’s coming up deuces for much of the region. More than 2 inches of rain has fallen in New River, in two gauges near Anthem and at Lake Pleasant, with more than 1.5 inches in Tramonto, Norterra and elsewhere in North Phoenix. Rain and showers from Rosa’s remnants could continue into tomorrow.

A Flash Flood Watch remains in effect through Tuesday evening, with Anthem, New River and other areas north of the Carefree Highway most at risk for heavy rains and flash floods as mountains enhance rainfall potential. The heaviest downpours are expected to affect all of Phoenix Monday night into Tuesday morning.

The remains of Hurricane Rosa began raining on North Phoenix Sunday night, with 2-3 inches possible by mid-week. Flash flooding is possible across Phoenix—and particularly in Anthem, New River and other areas north of the Carefree Highway—when the heaviest rains arrive late Monday into Tuesday.

Hurricane Rosa has made the northward turn that will eventually bring the storm to Arizona. The forecast continues to call for 2-3 inches of rain in North Phoenix, and a Flash Flood Watch is in effect for Monday and Tuesday.

Whereas monsoon storms can be isolated, capricious and violent, Rosa’s remains will be more zombie-like: longer, slower, persistent. North Phoenix could get an inch or more of rain between Sunday night and Thursday.

The remnants of several hurricanes and tropical storms have struck Arizona, in a few cases catastrophically. In 1970, a tropical system killed 23 people in the state. See 9 of the most notable tropical systems that affected Phoenix.