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More than two thirds of the Colorado River begins as snow in Colorado, but warm temperatures and dry soil are steadily reducing the amount of snowmelt that makes its way into the river, which supplies water to 40 million people across the Southwest.

The West has been slammed by wet weather this winter: Good news for the Colorado River, where all that moisture hints at a possible springtime boost for the reservoirs that have been crippled by drought - but many more years of heavy snow are needed to make a serious dent. Read more»

After a half-inch of snow fell on Mt. Lemmon on Wednesday evening, hundreds of visitors and residents in Tucson headed up General Hitchcock Highway to throw snowballs, build icy snowmen, and try their hand at sledding.

After a half-inch of snow fell on Mt. Lemmon on Wednesday evening, hundreds of visitors and residents in Tucson headed up General Hitchcock Highway to throw snowballs, build icy snowmen, and try their hand at sledding. Read more»

A plane sits on the tarmac. These pressurized twin-engine airplanes carry both hygroscopic and glaciogenic flares to use for cloud seeding.

The Salt River Project, which delivers water and electricity to central Arizona, has formed a partnership with the White Mountain Apache Tribe to research the feasibility of ground-based cloud seeding in the White Mountains in eastern Arizona. Read more»

The snowy terrain of Olympic Valley, California.

The U.S. will need to make some serious changes to its water supply strategies as Earth’s climate continues to warm and snowpack in the country's western mountains becomes much harder to come by in the coming decades, according to a new study. Read more»

The Bighorn Fire in 2020 was visible from townhouses near Ventana Canyon as the fire burned downslope.

Agriculture Secretary Tom Vilsack told reporters that federal fire officials had warned to prepare for an extremely active fire year with several types of drought converging in the West this year, and "wildland fires now extend throughout the entire year, burning hotter and growing more catastrophic in drier conditions due to climate change." Read more»

The Santa Catalina Mountains were covered with snow after a winter storm swung through Tucson Monday night.

Tucson will see temperatures rise and fall through February, but this winter will stay warmer and drier than normal as the last quarter of a La Niña winter continues — the two feet of fresh snow atop Mt. Lemmon aside. Read more»

A saguaro arm is covered with a thin blanket of snow as a winter storm swung through Tucson on Monday night.

A winter squall brought rain and a little bit of snow to the Tucson valley Monday evening and Tuesday morning, and a hard freeze warning will be in effect for the metro area through 9 a.m. Wednesday. Read more»

Colorado water managers and ski resorts use remote cloud seeding generators like this one to boost a storm’s snowfall. This year Vail Resorts cut its $300,000 program, leaving some water managers worried it could result in decreased snowpack and streamflows

Money problems have forced Vail Resorts to pull this winter’s funding for its cloud seeding program — the longest-running in the state at 44 years — potentially reducing the amount of water flowing down the Colorado River this spring. Read more»

Arizona Snowbowl north of Flagstaff plans to replace a lift built in the 1960s with one it says will be among the largest in North America.

Arizona Snowbowl will replace an aging chairlift in need of repair with a much faster one, opening next season as part of a multimillion dollar, multiyear expansion, resort officials said Thursday. Read more»

A woman carrying a University of Arizona umbrella heads to class as snow falls around the UA campus on February 22, 2019.

Another cold and wet week is setting up across Arizona, which, unfortunately, will affect the Thanksgiving holiday. The approaching storm looks to be the biggest to take aim at the state so far this winter season, making for messy holiday travel. Read more»

As much as 2 feet of snow fell on parts of the Navajo Nation in the storm that hit northern Arizona in February, leaving many parts of the reservation inaccessible and leading to this week’s declaration of a disaster there.

President Donald Trump this week approved a disaster declaration for the Navajo Nation in the wake of a February storm that dumped snow on the reservation, isolating some communities and leading to flooding. Read more»

With winter weather in the forecast starting Thursday, motorists should be ready to make smart decisions when it comes to high-country roads that can become slick with snow and ice. That includes being ready to put off travel while snow is falling so plows can clear highways. Read more»

The Santa Catalina Mountains were shrouded in clouds and snow Thursday. Read more»

The winter weather continued Monday with an expected 4 to 10 inches of snow accumulation in some areas, according to the National Weather Service in Flagstaff.

The winter storm in Flagstaff on Monday may have closed public schools and forced offices to work with skeleton staffs, but it’s a welcome treat for many Flagstaff businesses. The northern Arizona city relies on its winter economy, officials said. And so far, the season has been mostly dry. Read more»

While much of Southern Arizona will be cold and rainy as the calendar flips to 2015, the National Weather Service has issued a winter storm warning covering areas above 5,000 feet, including the Catalina and Rincon mountains. Read more»

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