"Haboob"

When:

Lookups spiked on July 6, 2011.

Why:

On July 5, a massive dust storm rolled through Phoenix, AZ.

In describing the mile-high billowing wave, many media reports (and viral videos like this) referred to the storm as a "haboob."

The word comes from the Arabic habūb, which means "violent storm".

Photo: Titoxd / flickr