The Arizona monsoon technically starts June 15 each year, but every desert dweller knows that it's July when the fireworks usually get going — and we're not talking the Uncle Sam variety.
Monsoon rains, dusty haboobs and sunsets spectacularly punctuated by lightning: These are the moments that break up the monotony of months of 105-plus temperatures and send reporters dashing to the nearest intersection with puddles.
We love to watch the weather, tweet about it and share the latest photos of it, but how much do we really understand what's happening? To broaden our haboob-dotted horizons, we turned to Randy Cerveny, President's Professor in the School of Geological Sciences and Urban Planning. He's one of Arizona State University's weather experts, serving as rapporteur on extreme records for the United Nations/World Meteorological Organization, for which he researches and verifies global weather records.
Here, he walks us through four aspects of desert summers.
How do those marching armies of dust happen?
No rain downtown? Here's why
Are you using 'monsoon' correctly?
Recipe for a storm
Top image: A haboob rolls through Casa Grande, Arizona. Photo by Roxy Lopez [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], from Wikimedia Commons
More Science and technology
ASU to host 2 new 51 Pegasi b Fellows, cementing leadership in exoplanet research
Arizona State University continues its rapid rise in planetary astronomy, welcoming two new 51 Pegasi b Fellows to its exoplanet research team in fall 2025. The Heising-Simons Foundation awarded the…
ASU students win big at homeland security design challenge
By Cynthia GerberArizona State University students took home five prizes — including two first-place victories — from this year’s Designing Actionable Solutions for a Secure Homeland student design…
Swarm science: Oral bacteria move in waves to spread and survive
Swarming behaviors appear everywhere in nature — from schools of fish darting in synchrony to locusts sweeping across landscapes in coordinated waves. On winter evenings, just before dusk, hundreds…