A growing, sheared-over dust plume rose and arched over the highway from its roots a minute earlier as a “Desert Dust Bomb.” Its particles reddened both by internal iron oxide and the filtered sunset light, the dust cloud presented a striking and peculiar sight to motorists on this stretch of highway. It was but the frontal lobe of an extensive haboob that had dusted Tucson and vicinity densely, and that would blow onward well into the evening hours before settling out as far est as the lower Colorado River Valley. Lights down the road emanated from vehicles at a Border Patrol checkpoint barn erected over the road.
4 WSW Three Points AZ (10 Jul 21) Looking ENE
32.0626, -111.3852