Arizona Watcher
Two consecutive Category 5 haboobs swept the Phoenix metropolitan area this week, marking only the fifth and sixth Category 5 events in regional records that extend back to 2010.
The storms produced towering walls of dust, reducing visibility to roughly a half mile (0.8 km) and generating sustained winds near 50 mph, though officials reported no major structural damage.
Meteorologists said both events occurred late at night, which limited impacts on travelers and reduced the risk of traffic collisions during peak commuting hours.
Arizona State University researchers described the back‑to‑back Category 5 events as unprecedented in their records; the PHX‑DUST severity scale used to classify the storms was published in early 2026.
Drier surface conditions across the valley increased available loose soils to be lofted, and scientists noted broader climatic influences — including human‑caused climate change — could raise the probability of similar extremes.
Photographs from the storms show a vast dust front approaching a Scottsdale airport as grounded aircraft sat at gates and neighborhoods were quickly enveloped in thick haze.
The Arizona Department of Environmental Quality issued High Pollution Advisories after PM10 peaked at 5,841 µg/m³ in West Chandler; elevated dust affected 18 of 20 monitoring stations for about three hours.
The two haboobs struck in the early morning hours of Aug. 3 and Aug. 6, 2026. Officials and researchers will continue analyzing data to improve forecasts and warnings for future dust storms.
Two consecutive Category 5 dust storms swept across the Phoenix region this week, producing blinding walls of dust, 50 mph winds and sharply reduced visibility but causing no major reported damage. Meteorologists say the timing — both events occurring later at night — limited…