PHOENIX (KSAZ) --The monsoon is coming to an end, but not the hurricane season.
Typically during the summer, tropical cyclones in the east Pacific move out west. But once September and October roll around, there is a change in the weather pattern.
And this is nothing new.
Tropical storm, tropical depression characteristics are moving into Arizona and bringing in heavy rain, as well as the threat of flooding.
We've seen it 16 times since 1950. And now heading into the weekend, we're tracking Hurricane Rosa currently churning in the east Pacific.
"It doesn't seem like this particular storm is going to move up the Gulf of California. It's going to take a track that's more similar to Nora or Joanne from 1972," said Larry Hopper, a meteorologist at the National Weather Service in Phoenix.
In 1972, Hurricane Joanne moved into south central Arizona, dropping more than 5 inches in some areas.
In 1977, Nora's track was further west. Yuma picked up four inches of rain in just one day. That's more than their annual average rainfall.
The Harquahala Mountains in western Arizona picked up 12 inches.
"That is obviously the highest amount of what you can expect and that was over multiple days, so a lot of times it depends on how fast the system is moving and if they have prolonged rainfall threat," Hopper said.
Of course, every hurricane is different.
"Typically from rainfall in the past, you can get anywhere from two to four inches with a lot of these systems with maximum totals widespread one to 2," Hopper said.
Early next week, Hurricane Rosa has the potential to bring significant impacts to Arizona if things don't change.
"Beyond this system, there is a chance we can have continuous rainfall even beyond Rosa moving through because we'll have another disturbance moving in from the west into the middle of the week," Hopper said.
Of course, we are four to five days out, so there is still quite a bit of uncertainty in the track.
Stay updated with Fox 10 Phoenix as we track Rosa's path into next week.