Arizona
How Arizona's monsoon is changing
PHOENIX — Each summer, thunderstorms tower in our otherwise sunny Arizona sky. Winds shift out of the south and southeast, bringing moisture in all the way from the Gulf of Mexico. That moisture rises and forms thunderstorms in the heat of the day. This is our monsoon.
Much of Arizona typically receives 30 to 50 percent of its annual rainfall during the monsoon months of June, July, August, and September, which helps replenish our dry land and diminish wildfire threats.
UA
But, the monsoon as we know it is changing. As our atmosphere gets hotter with climate change, it’s able to essentially hold more water vapor and that’s altering how our monsoon behaves.
“We don’t get as many storms, but when they do come, they’re tending to produce higher rainfall amounts, more intense rainfall, and more intense winds,” says Dr. Christopher Castro with the Hydrology and Atmospheric Sciences Department at the University of Arizona.
That’s exactly what we saw play out here in Phoenix last summer. It was our hottest and driest monsoon on record. Sky Harbor only received 0.15 inches of rain. That’s more than 2 inches below normal.
But, what is considered a “normal” amount of monsoon rain has changed a lot in the past 50 years.
Every 10 years, new normals are calculated based on a rolling 30-year average. Our latest update came in 2021, giving us a new average that is based on rainfall data from 1991 to 2020.
This new normal showed an average rainfall in Phoenix for the monsoon season of 2.43 inches of rain. That’s more than a quarter of an inch drier than the previous average, which is a big difference here in the desert!
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Castro and his team at the University of Arizona are leading the way when it comes to research on how climate change is impacting our monsoon. Although not yet published in scientific peer-reviewed journals, they have run experiments simulating how storms move down into the Valley.
They have discovered that a greater number of green spaces, like parks, golf courses, and green landscaping, are leading to fewer storms making it down into the city.
“The presence of all these watered areas is suppressing the amount of instability in the atmosphere. So, it’s harder to initiate storms from the outflow boundaries,” he says.
So, as storms try to move down off of the Mogollon Rim, they are now often getting diverted around the periphery of the Phoenix metro instead of rolling right through it like they used to.
Scientists like Castro have also seen a broadening of our monsoon ridge, which is impacting our monsoon, too.
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It’s the ridge of high pressure, which sets up near the Four Corners during the summer, that allows monsoon moisture to flow in.
“What we’ve observed in the last 20 years or so, is that the monsoon ridge is growing more intense and more spatially expansive. The bigger and more expansive that ridge is, the more propensity there is for the air to sink from the upper atmosphere. So. it suppresses the atmospheric instability and it makes storms harder to form,” Castro says.
That’s exactly what happened last year. As that ridge of high pressure sat over Arizona, it suppressed storm formation and made it much hotter. Our 2023 monsoon season was the hottest and driest on record in Phoenix.
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2020 was also a so-called “non-soon” with only 2 days of measurable rain in Phoenix. That year, we received 90% of our monsoon rain (0.90 inches) in just 2 hours with one particularly bad storm the night of August 20, 2020.
Castro says that’s the fingerprint of climate change in the desert.
“It’s really about the extremes. The monsoon is, generally all the way around, getting more extreme. So, when we get our heat waves now those are more intense than they used to be and when it rains, it may not rain as frequently as it used to, but it tends to be more intense,” Castro says.
That intensity makes it harder for us to adapt.
When it’s extreme heat, we see more heat-related deaths. We had 987 heat-related deaths across Arizona last year. 645 of those happened in Maricopa County, mostly during the hottest and driest monsoon on record.
When it’s extreme rainfall, we see more flash flooding and complete destruction near wildfire burn scars since the charred ground can no longer absorb water.
“From the water supply perspective, it’s bad news for recharge of the groundwater table. If you’re drying out the soils and then realizing your precipitation with only a few intense events, more of that precipitation is likely to run off. There’s also a greater danger for wildfires to happen and that totally changes the characteristics of the permeability of the soil. Then, when it rains, that water will immediately wash off very similar to a landslide,” Castro says.
A bigger, broader monsoon ridge also deflects atmospheric disturbances, known as inverted troughs, from tracking through Arizona.
Those disturbances often serve as triggers to get widespread rain and thunderstorm activity going during the monsoon.
“The expanded monsoon ridge is suppressing the path of those inverted troughs more to the south, so the number of inverted troughs is decreasing. So, the frequency of big precipitation events is decreasing. But when they do occur, they’re occurring in a more moist environment that is favorable for heavier amounts of precipitation,” says Castro.
We’re seeing similar impacts across the country as the number of heavy downpours increases in this warming world.
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While downpours are increasing, periods of drought are increasing too.
Climate Central
So we are increasing both of these extremes as our climate changes.
Castro says, “We’re going into a world where we have these more dramatic swings in climate variability, whether it’s winter or summer. There’s been this term coined climate whiplash, you go from one extreme to another, either between seasons or within a season. This is devastating from the standpoint of climate and our resiliency to the natural climate because if we’re exceeding the ranges of which our natural and human systems can cope with these whiplash swings, you’re going to go from one year where a dam nearly fails because it’s flooded to a year of devastating wildfires and the ecosystem cannot recover.”
Arizona
AP men’s basketball Top 25: Arizona remains No. 1, Nebraska earns highest ranking since 1991
Arizona maintained its position as the No. 1 team in the Associated Press men’s basketball Top 25 on Monday, earning 42 of 61 first-place votes after a week that included a 96-75 win over No. 16 Alabama.
The Wildcats (9-0), one of seven undefeated teams remaining in Division I, already own five wins over high-major opponents.
There was little movement in the top 10 after a week with few upsets. Michigan (10-0), Duke (10-0), Iowa State (11-0) and UConn (10-1) remained Nos. 2-5, respectively. The only team to move up in the top 10 was No. 7 Gonzaga (10-1), which swapped places with No. 8 Houston (10-1) after adding another top-tier win over UCLA on Saturday.
The greater movement occurred between Nos. 10-25.
Nebraska (11-0) was the biggest riser, jumping eight spots to No. 15 after Saturday’s 83-80, buzzer-beating win over No. 18 Illinois. The Huskers, the lone power-conference team to never win an NCAA Tournament game, achieved their highest ranking since 1990-91, when they finished the season No. 11.
Illinois (8-3) and No. 23 Florida (6-4) were the biggest fallers, dropping five spots apiece.
Georgia (9-1) was the lone newcomer to the poll at No. 25, while UCLA (7-3) dropped out.
Here’s the full poll, along with my ballot:
|
Rank
|
Team
|
Record
|
Prev
|
CJ’s vote
|
|---|---|---|---|---|
|
1 |
9-0 |
1 |
2 |
|
|
2 |
10-0 |
2 |
1 |
|
|
3 |
10-0 |
3 |
5 |
|
|
4 |
11-0 |
4 |
3 |
|
|
5 |
10-1 |
5 |
4 |
|
|
6 |
10-1 |
6 |
6 |
|
|
7 |
10-1 |
8 |
7 |
|
|
8 |
10-1 |
7 |
10 |
|
|
9 |
9-1 |
9 |
9 |
|
|
10 |
9-1 |
10 |
8 |
|
|
11 |
9-1 |
11 |
11 |
|
|
12 |
9-1 |
14 |
15 |
|
|
13 |
10-0 |
15 |
12 |
|
|
14 |
8-2 |
17 |
14 |
|
|
15 |
11-0 |
23 |
13 |
|
|
16 |
7-3 |
12 |
17 |
|
|
17 |
8-3 |
19 |
16 |
|
|
18 |
8-3 |
13 |
18 |
|
|
19 |
7-3 |
16 |
21 |
|
|
20 |
7-3 |
20 |
20 |
|
|
21 |
8-3 |
21 |
NR |
|
|
22 |
6-3 |
22 |
24 |
|
|
23 |
6-4 |
18 |
19 |
|
|
24 |
9-1 |
24 |
22 |
|
|
25 |
9-1 |
NR |
25 |
|
|
NR |
9-2 |
NR |
23 |
Others receiving votes: USC 68, Iowa 47, Seton Hall 46, LSU 19, Kentucky 19, UCLA 16, Clemson 14, California 13, Saint Mary’s 12, Arizona State 5, Villanova 5, Notre Dame 4, Indiana 4, Miami (Ohio) 4, Miami (Fla.) 4, Utah State 2, Saint Louis 1, Wisconsin 1.
How good is Nebraska?
I caught Nebraska in person earlier this season when it beat New Mexico and Kansas State in Kansas City, Mo., and I’ve been a believer since. It’s a classic Fred Hoiberg team with a playmaking big, tons of shooting and awesome offensive execution. But what also stood out was how hard the Huskers played, and the defense is better than many of his best teams of the past at Iowa State.
The numbers are starting to back that up. The Huskers are up to 28th in adjusted defensive efficiency, the highest ranking ever for a Hoiberg defense. All this team was missing was signature wins, and it got two this past week, crushing Wisconsin 90-60 and then winning on the road at No. 18 Illinois on a last-second shot.
HE HIT IT‼️
Jamarques Lawrence’s 3-pointer right before the buzzer sends No. 23 @HuskerMBB to a dramatic win at No. 13 Illinois. pic.twitter.com/PhSr8kmnQn
— Big Ten Network (@BigTenNetwork) December 13, 2025
Arkansas could keep climbing
Arkansas fell out of my rankings for a few weeks early in the season because its computer numbers were bad after a few close calls against mid-majors. It was obvious the talent was there, but the Razorbacks just weren’t sharp early. They’re starting to play up to their talent, and I moved them up to 14th this week, which is one spot below where I had them in the preseason.
John Calipari’s best teams always have an NBA-level point guard, and he has one in Darius Acuff, who is averaging 17.7 points and 5.7 assists. Calipari also has three big wings who could develop into pros — Meleek Thomas, Karter Knox and Billy Richmond III — and as I wrote about in my weekly rankings, Trevon Brazile is playing the best ball of his career. This team is deeper and more talented than last year’s group, which got hot late and made the Sweet 16. Might still be a little low on this group.
Best team not ranked: Iowa
Iowa has yet to make the AP Top 25, but I’ve ranked the Hawkeyes the last three weeks and would argue their case was made even stronger last week in a loss. Iowa led Iowa State by 13 in the first half last Thursday at Hilton Coliseum and ended up taking a 4-point loss, which actually moved it up in the computer models. The Hawkeyes now rank 20th at KenPom and Bart Torvik, 19th in the NET and 21st at Evan Miya.
As the Hawkeyes proved against Iowa State, they are a tough out. Similar to Drake last year, Ben McCollum’s second Division I team gives nothing in transition, is hard to score against in the half court and is exhaustingly patient offensively waiting for a great shot to develop.
I can understand why my fellow voters aren’t there yet. With Ole Miss being a disappointment, you could argue Iowa is missing a signature win. The first opportunity is Jan. 3 when Iowa hosts UCLA.
Arizona
Arizona baseball pitching coach John DeRouin taking position with Mets, per report
Pitching was a big reason why Arizona made it back to the College World Series last season. The return of many key arms for 2026 makes it likely the Wildcats will again have a stellar staff.
Who guides those pitchers, however, is uncertain.
Michael Lev of the Arizona Daily Star is reporting that pitching coach John DeRouin is leaving the program for a position within the New York Mets organization. DeRouin had been elevated to pitching coach over the summer after Kevin Vance was hired as head coach at San Diego State.
DeRouin, who was a pitching strategist under Vance the previous two seasons, was integral in developing Arizona’s arms, particularly starters Owen Kramkowski and Smith Bailey and reliever Tony Pluta. That trio are among several key pitchers returning from the CWS team, with DeRouin’s promotion factoring in their decisions to stay in Tucson.
“John is like the pitching whisperer,” head coach Chip Hale said last month.
Hale could promote from within again, elevating Owen Cuffe. Whoever he hires will technically be his fourth pitching coach in five seasons. Dave Lawn handled the role in 2022-23, retained from Jay Johnson’s staff, before Vance was hired in 2024.
DeRouin is the latest in a string of college baseball coaches leaving for pro jobs. The most notable is Tennessee head coach, hired last month as manager of the San Francisco Giants
Arizona begins preseason practice in January ahead of the 2026 opener Feb. 13 against former Pac-12 rival Stanford at a tournament in Surprise.
Arizona
Report: Michigan search includes Arizona State’s Kenny Dillingham, Missouri’s Eli Drinkwitz
ANN ARBOR, Mich. — The firm hired by Michigan to search for a football coach to replace Sherrone Moore has contacted representatives for Arizona State’s Kenny Dillingham and Missouri’s Eli Drinkwitz, according to a person familiar with the situation.
The person spoke to The Associated Press on condition of anonymity Saturday because they were not authorized to share details of the search.
Moore was fired on Wednesday, when the school said an investigation uncovered his inappropriate relationship with a staffer. Two days later, Moore was charged with three crimes after prosecutors said he “barged his way” into the apartment of a woman he’d been having an affair with and threatened to kill himself.
College football’s winning program suddenly needs a coach.
After the 35-year-old Dillingham was linked to numerous open jobs last month, he said he was not leaving his alma mater.
Two weeks ago, Drinkwitz agreed to a six-year contract that increases his average compensation to $10.75 million annually.
Michigan is hoping to hire a coach this month, helping its chances of retaining recruits and keeping key players out of the transfer portal in January.
Dillingham, who is from Scottsdale, Arizona, graduated from Arizona State in 2013 and started his coaching career as an assistant for the Sun Devils. After coaching at Memphis, he was the offensive coordinator for Auburn, Florida State and Oregon before returning to Arizona State.
Dillingham orchestrated a quick turnaround, leading the Sun Devils to the Big 12 championship and the College Football Playoff for the first time last year.
Arizona State was 8-4 this season, improving Dillingham’s record to 22-16 over three seasons.
The 42-year-old Drinkwitz is 46-28 in six seasons at Missouri after going 12-1 in a year at Appalachian State. He has built the Tigers into a steady Southeastern Conference program, earning five straight bowl bids.
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