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The Pineapple Express is headed to the US

February 21, 2021. Summarized by summa-bot.

Compression ratio: 49.1%. 2 min read.

An atmospheric river event known as the "Pineapple Express" is forecast to bring a prolonged period of wet weather to Washington and Oregon beginning Sunday.

(CNN)An atmospheric river event known as the "Pineapple Express" is forecast to bring a prolonged period of wet weather to Washington and Oregon beginning Sunday.

With the ground already saturated from previous storms, flooding is possible even from a few inches of rain the storm is forecast to produce.

"This will mark the beginning of a wet period across Western Washington, as the southern periphery of the Atmospheric River will affect the region before it shifts southward over the area Monday," the National Weather Service office in Seattle warned Saturday.

This could be another notable weather event for parts of Washington and Oregon, with localized urban and river flooding along with gusty winds which could lead to power outages across both states.

This particular atmospheric river event is special in terms of where its moisture comes from — Hawaii.

Pineapple Express is the name given to an atmospheric river that originates near Hawaii and travels across the Pacific Ocean to the western coast of North America.

"When it reaches the West Coast, the Pineapple Express can dump as much as five inches of rain on California in one day," according to the National Oceanic and Atmospheric Administration.

An atmospheric river event in January dumped between 5 and 10 inches of rain across the Olympic Peninsula and extreme northwestern Oregon.

The heavy rainfall produced widespread flooding and landslides while high winds caused significant tree damage and power outages in western Washington and northwestern Oregon.

High winds, high tides, and high potential for river flooding will all be factors from this next storm.

Flooding will be a concern not only because of the amount of rain that is expected to fall, but also due to the fact that the ground is already at near-saturated levels in many locations, and there will be some snowpack melt as well.

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