"It was pretty impressive," Wilson said. "This is a fairly uncommon event just due to the size and lower visibility of the dust storm," she said, noting that the Hanford office's senior forecaster issued his first career dust storm warning for several counties.
"It was unusually dry for several months," Wilson said, adding that a low pressure system "picked up all that dust and carried it across the entire valley."
The weather service staff were able to see the haboob with their own eyes, a "distinct wall of dust" that "looked just like a classic Arizona dust storm," according to Wilson.
In some places, visibility was less than 100 feet, she said.
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