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Weather and Climate

Lake Mead outside Las Vegas, Nevada, serves as the Colorado River's largest reservoir and a key water source for Arizona, California, Nevada and Mexico.

High Snowpack Could Temporarily Stave Off Colorado River Water Shortage

Mar 19, 2019 But federal officials are quick to remind that one wet winter won’t solve the Southwest’s structural water problems.
Looking west as a dust storm forms near Interstate 10 in Pinal County, July 10, 2018.

Advanced Dust Storm Detection Coming for I-10 Drivers

Mar 19, 2019 ADOT's radar-based system rolls out later this year.

Monitor: Pima County is Drought-Free, for Now

Mar 15, 2019 The spell will not last long as the temperatures rise.
A firefighter sets a back burn to contain the Poomacha Fire in San Diego County, California, 2007.

Tree-Ring Research Reveals Broken Connection Between Weather and Wildfires

Mar 8, 2019 UA professor Valerie Trouet co-authored a study showing jet stream moisture no longer predicts California wildfire severity.
Northern Arizona University in Flagstaff.

Recent Storm Costs NAU at Least $100K In Snow Removal Alone

Mar 5, 2019 Although exact costs aren't finalized, officials said clearing the pathways around campus was a costly endeavor.
Students and staff enjoy the snowfall on the University of Arizona mall. From February 22, 2019.

An Unusual Tucson Sight: Snow in the City

Feb 22, 2019 While multiple feet blanketed the mountains, flakes were falling on the city Friday morning.
The southern slope of Sentinel Peak, also known as "A Mountain," covered in buffelgrass.

Flowers and Fire: Rain a Double-Edged Sword in the Desert

Feb 22, 2019 While moisture can mean impressive wildflower blooms, recent rains are fueling invasive species that feed wildfires.
A plow refuels in the Flagstaff area, Feb. 21, 2019.

Snow Storm Closes Arizona Schools, Clinics

Feb 21, 2019 A record-breaking storm hit north-central Arizona on Thursday.
Tucson woke up to snow on the Catalina Mountains. Feb. 19, 2019

Tucson's Wet Winter Continues

Feb 20, 2019 The city of Tucson expects more rain in town and snow on the mountains.
Raindrops fall in pooling water on a Tucson street.

Climatologist: Nothing Too Unusual About Arizona's Recent Weather

Feb 18, 2019 Residents of the state shouldn't be surprised about the precipitation, as it's basically where it should be.
Lake Powell on the Utah-Arizona border continues to drop as snowpack declines throughout the southwestern U.S. The narrow passageway shown here in September 2018 has been rendered unusable as water levels drop.

Experts: Southwestern US Sees Some Drought Relief

Feb 15, 2019 Though climate scientists warn recent moisture isn't enough to relieve worries over the long-term water supply.
The fate of Lake Powell on the Utah-Arizona state line is one consideration in crafting drought contingency plans for the Colorado River.

What is Happening With the Colorado River Drought Plans?

Feb 7, 2019 Five states are done, but California and Arizona failed to meet a federal government deadline to wrap up negotiations and sign a final agreement.
Boulder Basin at Lake Mead.

Stakeholders Reflect On Deadline Passage of Arizona Drought Plan

Jan 31, 2019 Lawmakers adopted a plan that stakeholders have been negotiating since last summer.
Floating sensors help scientists measure ocean temperatures for clues to causes of climate change.

Public Not Hearing 'Cathedral' of Science Behind Climate Change, Researcher Says

Jan 29, 2019 Joellen Russell is an oceanographer collecting data impacting how scientists measure an forecast climate change.
A wildfire last summer left even fewer numbers of the endangered red squirrel on Mount Graham.

Climate Change Endangering Arizona's Natural Resources, Prof Says

Jan 14, 2019 Stuart Marsh wants policymakers to understand links between natural resources and the environment
Drivers on Arizona State Route 77 had a view of desert covered in snow, Jan. 1, 2019.

Hard-Freeze Warning Issued for Tucson Metro Area

Jan 2, 2019 Counties southeast of Tucson can expect even harsher temperatures.

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