What is A Haboob, And How Can They Can Be Dangerous?

Monsoon season is getting ready to drop in, and alongside it is the risk of serious dust storms called haboobs. You may have seen a haboob before, building on the horizon like a wall of dust. When a Haboob hits, visibility drops, dust fills the air, and traveling can become a hazard.

These storms form through well-understood desert weather dynamics, but their sheer size and speed can throw people off. In Arizona, these dirt storms are most likely to hit during the late summer months when rain is more common. What causes these storms to form, and are they dangerous?

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What causes a Haboob?

A haboob forms when powerful downdrafts from collapsing thunderstorms push large amounts of dust into the air. As these surges of wind hit Arizona's dry, sandy ground, it lifts massive amounts of loose dirt into the air, creating a dense wall that can stretch on for dozens of miles.

The leading edge of this outflow boundary creates the towering dust wall people recognize. Even thunderstorms that produce little to no rain can generate enough wind to trigger a haboob, especially during rainy months when heat, loose soil and sand, and moisture work together to fuel these dramatic dust events.

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Are they dangerous?

Haboobs create hazardous conditions before the dust wall even arrives. The leading winds can exceed 60 miles per hour, knocking down power lines, trees, and unsecured structures. According to the National Weather Service, in August 2025, a dust storm hit Phoenix, Arizona, and hundreds of people were left without power, traffic came to a stop, and planes from Sky Harbor were forced to stay on the ground.

Once the dust wall hits, visibility becomes extremely limited, with most people only being able to see 3-4 feet in front of them. When these conditions start, driving becomes extremely dangerous. On top of the limited visibility, the airborne dust can cause breathing issues, especially for people with asthma and other respiratory conditions. Even after the main front passes, lingering dust can reduce air quality for hours. In Arizona, the safest response to a haboob is to pull over, make sure your windows are closed, and wait it out. 

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Time of year and size

In Arizona, haboobs are most common in June- September when thunderstorms arive to the state and bring strong winds with them. These storms often begin to collapse in the late afternoon or early evening, sending a powerful outflow wind across the desert floor. That's when the massive dust wall forms and begins its rapid advance.

Haboobs move at an average speed of 60 miles an hour, fast enough to overtake cars on a highway. Some haboobs can grow to be over a mile tall and 60 miles long. Every year, Arizona experiences several major haboobs, as well as dozens of smaller dust storms across the state.

If you ever see a haboob, make sure to close your windows and stay inside. If you are driving, pull over and turn on your hazard lights. The limited visibility caused by a dust storm can lead to multiple-vehicle crashes and other dangerous situations. Stay safe this summer, and keep an eye out for this unique desert storm!

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