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Rainfall relief in sight as stormy pattern continues to cause flooding concerns across Northwest

AccuWeather logo AccuWeather 11/28/2021 Jessica Storm

Relief is in sight for the rain-weary Pacific Northwest come December, but residents need to make it through at least one more gusty, rainy storm that could bring rain totals to record levels.

"To say it has been an active month in the Northwest is an understatement," said AccuWeather Meteorologist Joseph Bauer, explaining that the observation site at the Seattle-Tacoma International Airport has received 10.05 inches of rain to date in November, which makes it the fifth wettest November on record for that site.

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After a summer of devastating drought, this region is now overflowing with rain. In some places, this excess of rainfall has even been dangerous. Earlier in the month, an atmospheric river caused major flooding and landslides, washing roads and railroad tracks away near Vancouver.

Already known as Rain City or "Raincouver" to some, Vancouver has reported over 8 inches of rain so far this month, which is near twice the amount the city receives in November on average. The forecast isn't looking much better for the West Coast, as another potent storm is expected to arrive this week.

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"More precipitation is on the way early this week, which will add up to an additional inch to Seattle's total before month's end," warned Bauer. The heaviest rain is forecast to fall from Tuesday to Wednesday, primarily in western Washington state and coastal British Columbia, Canada.

Though an inch or two of rain may not seem like enough for flooding, due to the recent non-stop rainfall, the ground is already saturated and many bridges and roads have only recently been repaired after the last several storms. The storm could cause flooding of rivers and streams, landslides, road closures and even snow mixing in with the rain at higher elevations. Motorists should also be aware of changing visibilities, and residents should prepare for power outages as gusty winds could down trees easily due to saturated soil.

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This graphic shows the observed river levels (thick blue line) and the NWS Skagit River level forecast (thin dotted line) for the coming week. (NWS)

The National Weather Service (NWS) was forecasting the Skagit River near Mt. Vernon to peak at over 30 feet this week, which would be designated as a major flood stage. As of Sunday morning, the Skokomish River near Potlatch was already in a minor flood stage and forecast to move into moderate this week.

This storm could even push many rainfall totals close to record level.

"The record amount of precipitation in November for Seattle-Tacoma is 15.63 inches set back in 2006, so this month will likely not beat that record, but will definitely place its mark within the top 5," added Bauer.

Vancouver is likely to receive about 2-4 inches of rain, with 4-8 inches falling just to the north. This higher-end amount of rain accompanied by more widespread flooding is also expected across the Olympic Peninsula and much of Vancouver Island by Wednesday evening. Fortunately, relief is now in sight for residents of the waterlogged region.

"The weather pattern is changing heading into early December with a large area of high pressure moving into the northern Pacific," said Bauer, adding that this will act to decrease the potential for additional atmospheric river events in the Northwest, lowering the frequency of precipitation.

Early December is anticipated to bring a much-needed break from continuous rainfall and allow rivers and creeks to recede a bit.

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