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Mysterious "Milky" Rain Falls In The Northwest And No One Knows Why

The dirty rain was reported Friday in Oregon, Washington, and Idaho, leaving meteorologists baffled. "It's a mystery at this point."

Last updated on February 6, 2015, at 11:00 p.m. ET

Posted on February 6, 2015, at 9:49 p.m. ET

Residents of the Pacific Northwest are used to dealing with rain, but on Friday, a mysterious "milky" version fell from the skies, baffling locals and meteorologists alike.

National Weather Service, Spokane

Rainwater collected Friday from a gauge in Spokane is shown.

Reports of the bizarre rain, which many described as having a "dirty" appearance and left cars covered in a white residue, began pouring in from across the region Friday morning.

Mark Turner, a meteorologist at the National Weather Service in Spokane told BuzzFeed News the milky rain was reported in Oregon, Washington, and Idaho — but the cause is a mystery.

NWS Spokane

A map shows the locations where the "milky" rain was reported Friday.

"We have heard a few theories thus far including; volcanic ash from Mexico or Russia, dust picked up from last night's strong winds, or perhaps ash from last year's wildfires over SE Oregon/SW Idaho," the weather service said on Facebook. "We still don't have a definitive answer."

National Weather Service, Spokane

The emergency management office in Walla Walla County, Washington, also suspected a volcanic eruption could be the cause of the dirty rain.

"We have received reports of 'white stuff' on vehicles," it said in a Facebook post. "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."

Here's a closeup of the "dirty" rain at our office. #wawx

NWS Spokane@NWSSpokaneFollow

Here's a closeup of the "dirty" rain at our office. #wawx

11:51 AM - 06 Feb 15ReplyRetweetFavorite

But that explanation was just one of many theories, and by no means confirmed as the cause.

"Oregon has had strong winds," Turner said. "It could just be that an area has been dry and strong winds kicked up some dust."

While the phenomenon certainly is strange, it isn't unprecedented for the area.

"In some summer dry spells we'll get big dust storms and then if it rains we can see a similar thing," Turner said. "But the timing of this is odd."

The 'dirty rain' near @NWSSpokane might be from Japan's Sakurajima eruptions lately #wawx

James Hyde@wxmeddlerFollow

The 'dirty rain' near @NWSSpokane might be from Japan's Sakurajima eruptions lately #wawx

4:29 PM - 06 Feb 15ReplyRetweetFavorite

Whatever the reason for the occurrence, meteorologists are planning to get to the bottom of it.

"We're looking at satellites and running computer models backwards" in hopes of finding the source, Turner said. The weather service in Spokane has also reached out to other agencies that may have collected samples for testing.

"We don't really know," Turner said. "It's a mystery at this point."

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