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Global average carbon dioxide concentrations as seen by NASA’s Orbiting Carbon Observatory-2 mission, June 1-15, 2015.

NASA: Spike In Atmospheric CO2 Related To El Nino

A vicious cycle might await if future climates reflect similar conditions of heat and drought.

The Art of Paying Attention: Alligators

Author and wildlife illustrator Beth Surdut shares her adventures paddling with the Myakka River's most famous inhabitants.
Hurriane Maria in the Caribbean approaching Puerto Rico, September 2017.

Raytheon Drones Fly Into Hurricanes to Collect Data

'Coyotes' were used recently in Hurricane Maria to aid in continuous monitoring.
Cars drive through flooded streets during a monsoon storm. From July 2017.

Dry End Bringing a Close to Above-Average Monsoon

Months that proceeded a record-breaking July have brought below-average rain.

'Mini-Spike' in AZ Gas Prices After Hurricane Harvey Expected to Pass Quickly

An industry analyst says a significant rise isn't expected, and prices should return to normal by the end of the month.
A man rests in the shade on a hot day in Tucson.

Dry, Hot August Follows Record-Setting July Rain

Weather Service meteorologist says storms become less frequent in September, unless a large Pacific storm hits.
A fire tower burned by the Frye Fire in 2017.

Looking Back on Fire Season in Arizona, and Places Touched by the Flames

Wildfire activity rose statewide, and Southern Arizona was home to some of the state's largest fires.
The five-day outlook shows a strong chance that a cyclone will form of the Baja Peninsula by the end of the week, possibly bringing storms to Southern Arizona.

Large Pacific Storm Could Bring Heavy Rain to Southern Arizona

Storm forming south of the Baja Peninsula has strong chance of becoming a cyclone.
DeAnna Bublitz finds plenty of cicadas on the University of Arizona's mesquite trees.

Summer's Insects Draw Scientists to Southern Arizona

Hot and humid weather is optimal for exploring the outdoors.
The Flandrau Science Center and Planetarium (left) and the Kuiper Space Sciences Building (right) on the University of Arizona campus.

UA Opens Science Classes to the Community

The school is offering reduced tuition to attend lectures in many subjects.
A lightning strike over east Tucson.

Tucson Sets July Rainfall Record, 2nd-Highest Monthly Total

July's rain total was higher than average rainfall for an entire summer rain season.
Lightning from a monsoon storm silhouettes palm trees against a dark sky. From July 2017.

Study Shows More Intense Monsoon Storms on the Horizon

Storms are predicted to be less frequent, though more intense in the area south and west of the Mogollon Rim.
A saguaro cactus in front of a dark monsoon sky.

Fire Restrictions Lifted in Coronado National Forest

Monsoon rains dampened the likelihood of blazes.

Understanding How Microbursts Are Formed

The high-velocity downbursts collapse roofs and uproot trees.
A lightning strike over east Tucson.

Monsoon Brings Danger of Flash Flooding to Arizona

Meteorologist: Deadly event near Payson is an example of flash-flood dangers.
Strong winds from an afternoon storm affect some palm trees in midtown Tucson.

Monsoon Starts Late, Starts Strong

Tucson and southeast Arizona see the first significant, widespread rain in 'good start' to the season.

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