Arizona may say hello to Hurricane Dolly this weekend to the tune of 4 inches of rain.

As Dolly continues to pummel south Texas and northern Mexico, Accuweather.com hurricane center meteorologists say Dolly will bring extreme rain into Arizona and New Mexico this weekend.

SLIDESHOW: View photos from July 21 microburst in Mesa

SLIDESHOW: View photos from July 13 monsoon flooding

By the weekend, the rain from Dolly will be absorbed by the monsoon flow into the desert Southwest, according to Accuweather senior meteorologist Jim Andrews.

National Weather Service meteorologist Valerie Meyers in Phoenix said she believes there will be precipitation in the Valley, but isn't sure it will be 4 inches. "Moisture is extremely finicky," Meyers said. "We think moisture will come in likely starting Friday night and pick up into Saturday. We could see all kinds of clouds and go 'when is it going to rain?' and it could be a dud. We really can't be sure and say how much we will get."

Meyers' colleague, storm-warning coordinator Ken Waters, said the forecast for the Valley as of Thursday afternoon is a 15 percent chance of rain today and 30 percent Saturday and Sunday. That could be up to 50 percent Saturday in higher elevations.

"The southeast part of the state will likely see rain first and get hit the hardest," Waters said. "We're not making any claims about a lot of rain yet, but we're keeping a close eye on Hurricane Dolly."

Salt River Project spokesman Scott Harelson said the utility's meteorologists agree that the potential for a heavy downpour this weekend is there, especially Saturday night.

"There are a lot of factors that could change the forecast quickly," Harelson said. "It's not like the winter when our meteorologists can forecast something a week out. In monsoon season, they say that tomorrow's forecast depends on what happens today. So we may know more about Saturday on Friday."

Harelson said that SRP is prepared with strategically positioned crews it can dispatch quickly to areas affected by heavy rain. He said he hasn't heard any concern expressed about saturated ground sites.

The Arizona Department of Transportation is also preparing for possible heavy rain, especially after a recent downpour. On July 14, the pump system for U.S. 60 was overtaxed when water rapidly began to collect in the Kyrene Road underpass. The three pumps did as much as they could before an impassible lake formed, halting dozens of vehicles for two hours.

"Anytime there's 3 or more inches of rain in a 30-minute period like we saw recently in Tempe, there's likely going to be issues on the roadways," said ADOT spokesman Tim Tait. "We try to make sure the drainage system is ready for a downpour."

Tait said ADOT workers recently performed scheduled maintenance, including using heavy vacuums, on catch basins from Mill Avenue to Interstate 10 on U.S. 60. He said the machines pulled out a large amount of debris from the catch basin on the Kyrene underpass, material likely lost at some point by a truck. Tait said pumps along the route received service and are expected to work to capacity.

Arizona Division of Emergency Management officials are also closely monitoring the track of Dolly, according to spokeswoman Judy Kioski.

"We're not first responders, so there is no real preparedness for us, just alerting agencies of what might be coming," Kioski said. "We're a few layers up. Local, then county responders are first."