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Weather and Climate

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.
Southern Arizonans got a taste of winter for the new year, 2019.

Photos: Storm Drops Snow on Southern Arizona

Jan 2, 2019 Forecasters issued a winter storm warning for the region until 5 p.m.
The Santa Rosa Canal ferries Central Arizona Project water to farmland within the Maricopa Stanfield Irrigation and Drainage District, Oct. 23, 2018.

Charting a New Course for Water Supply in the Southwest

Dec 28, 2018 Water managers in Colorado River Basin states spent much of 2018 working on drought contingency plans.
Sunrise over Mt. Lemmon in the Coronado National Forest.

Study: Slow Growth Ahead for the Forests of the Southwest

Dec 21, 2018 The UA report shows a decline in productivity in the 21st century as the climate warms.
Mosquitoes are historically among the worst carriers of infectious disease globally.

Researcher: Climate Change Could Worsen Mosquito-Borne Diseases

Dec 17, 2018 UA professor says globalization and increasing transportation also speed the spread of such diseases.
Low water levels at Lake Mead outside Las Vegas are prompting water leaders throughout the Western U.S. to undertake negotiations over the Colorado River's future.

Top Water Official Gives States Deadline for Colorado River Drought Deal

Dec 14, 2018 A final deal will require federal legislation and approval by the Arizona Legislature.
One of the electric vehicles in the Pima County fleet. The county plans to convert 10 percent of its fleet to EVs by 2025.

County Commits to Carbon Reduction Strategy

Dec 7, 2018 Pima County's updated sustainability plan renews its commitment to reducing carbon emissions.

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