A dust storm warning is issued by the National Weather Service in the United States when blowing dust frequently reduces visibility to 1/4 mile (400 m) or less. This typically occurs when winds reach 25 miles per hour (40 km/h) or higher. The warning alerts the public to potentially dangerous conditions caused by reduced visibility.
As of June 19, 2018, the National Weather Service began using the new "storm-based" dust storm warnings.
On November 1, 2018, the National Weather Service started issuing dust storm warnings in a polygon- and storm-based format, similar to severe thunderstorm and tornado warnings. The zone-based dust storm warning was replaced by the new blowing dust warning. Also, a dust advisory will be issued if the criteria for a warning are not met, but travel impacts are expected.
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