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While it was posted that the substance is likely ash is from Volcano Shiveluch, they are a number of volcanoes that are currently active. The source of the material has not been scientifically confirmed. According to a story posted by The Spokesman Review: "One meteorologist speculated that the dirt was volcanic ash that got into the atmosphere from Mexico." We have received reports of 'white stuff' on vehicles. The ash is more than likely from Volcano Shiveluch in Kamchatka Krai, Russia, which spewed an ash plume to about the 22,000-foot level in late January. It has been deposited in a wide spread area, including Washington and Oregon.
While it was posted that the substance is likely ash is from Volcano Shiveluch, they are a number of volcanoes that are currently active. The source of the material has not been scientifically confirmed. According to a story posted by The Spokesman Review: "One meteorologist speculated that the dirt was volcanic ash that got into the atmosphere from Mexico." We have received reports of 'white stuff' on vehicles. The ash is more than likely from Volcano Shiveluch in Kamchatka Krai, Russia, which spewed an ash plume to about the 22,000-foot level in late January. It has been deposited in a wide spread area, including Washington and Oregon.

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    Weather mystery in Washington state

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Weather mystery in Washington state

CNN's Derek Van Dam reports on what is causing a gray, milky substance on vehicles in Spokane, Washington.

Weather mystery in Washington state

CNN's Derek Van Dam reports on what is causing a gray, milky substance on vehicles in Spokane, Washington.