As A Strong Atmospheric River Drenches: T20 Northwest With More Than Eight Inches of Rain


As A Strong Atmospheric River Drenches: T20 Northwest With More Than Eight Inches of Rain

A powerful atmospheric river pounded the Pacific Northwest on Tuesday night, putting about 16 million people under flood alerts. This week, at least one person was discovered dead in the region after being swept away by floodwaters.

On Monday, a man was washed away by a flooded creek in Portland, Oregon, and rescue efforts by emergency personnel proved futile. According to a Multnomah County sheriff’s deputy who spoke with CNN later on Monday afternoon, the man’s body was found in Johnson Creek.

Strong Atmospheric River Drenches
Strong Atmospheric River Drenches


How the man got into the swift-moving water is still a mystery to investigators.

The majority of western Washington state and Oregon, including Seattle and Portland, were at risk of flooding. The majority of flood alerts while many of Oregon’s alerts are anticipated to remain in effect through Wednesday evening, those in Washington were scheduled to expire by 4 a.m. PT on Wednesday.

Preliminary rainfall totals from the Weather Prediction Center show that from mid-morning on Monday to early Tuesday evening, over 8 inches of rain fell in parts of the Pacific Northwest.

And there’s more to come: Wednesday could see an extra 2 to 4 inches of rain. River levels have been increasing and some are expected to reach significant flood levels on Tuesday and Wednesday.

The Skagit and Snoqualmie rivers in Washington state are especially dangerous. By late Tuesday morning, portions of both rivers had risen to major flood stage, and it is anticipated that these areas would inundate roads, farms, and even some homes.

Tuesday morning, the Grays River in southern Washington erupted to major flood stage, while parts of the Skokomish River in western Washington rose to moderate flood stage.

As per the initial data provided by the National Weather Service, the Stillaguamish River, situated north of Seattle, attained an unprecedented height on Tuesday afternoon. The river’s record, which stood from December 2010 to 21.34 feet, was surpassed. Nineteen feet is the major flood stage.


As A Strong Atmospheric River Drenches: T20 Northwest With More Than Eight Inches of Rain

Strong Atmospheric River Drenches
Strong Atmospheric River Drenches


On Tuesday, dozens of Washington roads had to close due to flooding. On a Snohomish County road, a driver drove their vehicle into floodwaters and was at least partially saved.
Amtrak service between Portland, Oregon, and Seattle was abruptly stopped on Tuesday due to a landslide that occurred during a period of heavy rainfall. Service exchanged between the two Amtrak says hubs is closed until Thursday morning.

In certain areas of southern Washington, far northwest California, and the Oregon Cascade mountains, more intense rainfall through Wednesday will only exacerbate the situation. The Weather Prediction Center states that there was a marginal risk of excessive rainfall on Wednesday, or Level 1 of 4, and a slight risk of excessive rainfall on Tuesday, or Level 2 of 4.

From Monday morning through Tuesday evening, 9.85 inches of rain fell in Granite Falls, Washington, and 8.67 inches in Olympic National Park. During that period, Lees Camp received 8.20 inches of rain, while the Nehalem River near Foos received 9.15 inches.

On Tuesday, flood warnings extended into northern Idaho and northeastern Washington from the coasts of Oregon and Washington.

The Olympic Mountains in Washington might getthe Cascades could see five to nine inches of rain, and the weather service predicted more than a foot. Residents should anticipate 3 to 5 inches along the coast and 1 to 3 inches in the interior lowlands.

Where This Week’s Rain is Predicted

Forecasted total amount of precipitation, including rain and other sources, for the next seven days.
The weather service advises residents experiencing flood conditions to stay inside or, in the event that shelter is not available, to seek higher ground the weekend that starts early.

On Wednesday, when this week’s atmospheric river ends, more information should become available regarding the precise magnitude and overall effects of this possible event.


Soaked Soils Increase The Risk of Flooding

The series of consecutive atmospheric rivers, referred to as an AR family, started on Saturday and did not give much of a respite before the system that developed Monday night. One of the main contributing factors to the higher risk of flooding is this lack of recovery time.

Monday’s snowfall brought the total amount of snowfall from the atmospheric river events to several feet in some locations, including 50 inches in Collins, Utah, and 49 inches in Rabbit Ears Pass, Colorado. Snowfall fell on parts of Utah and Colorado as well.

As A Strong Atmospheric River Drenches: T20 Northwest With More Than Eight Inches of Rain

Strong Atmospheric River Drenches
Strong Atmospheric River Drenches


An atmospheric river event with a level 4 out of 5 forecast to occur roughly thither whole Oregon coast this week. In the extreme northwest of the state, the atmospheric river’s severity peaked on Monday night and persisted into early Tuesday morning, scoring a Level 5 out of 5.

However, this most recent round of rain also brought with it warmer temps. Portland’s high of 65 degrees tied the city’s record high for the month of December, which was last set in 1993.

The Pacific Northwest has seen an increase in snowmelt due to the warm weather, which could result in excessive runoff and rising creeks and streams.


As A Strong Atmospheric River Drenches: T20 Northwest With More Than Eight Inches of Rain

Strong Atmospheric River Drenches
Strong Atmospheric River Drenches


Atmospheric river events are not always negative. Actually, AR event levels 1 and 2 are largely regarded as beneficial rains that are crucial for raising water supply levels in the western United States. However, AR because of the increased risk of flooding and travel hazards, event levels 4 and 5 are more dangerous than helpful.

Correction: Based on preliminary data, an earlier version of this article incorrectly stated the date the Stillaguamish River reached a record high. Tuesday was the day.

Storm activity is expected to decrease over most of the Northwest by late Thursday and Friday, although showers and some snow at higher elevations are still possible.

However, the respite from the rainy weather might not last long. There’s growing optimism about another atmospheric river that might arrive in the area by



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