An upper level trough Gulf Low continued off the west coast that brought a series of atmospheric rivers resulting in flooding across parts of western Washington. This second atmospheric river episode of the month was a set of three atmospheric rivers back-to-back-to-back. Water vapor transport into Western Washington averaged 160 - 200% of normal during the period of 11 November - 16 November. Heavy rainfall spread across the region on the night of the 11th through November 12, with the heaviest rain starting across Southwest Washington and slowly shifting to the north through the day. Rainfall totals ranged from 5 to 10 inches in spots leading to areal and river flooding, including major flooding.
Heavy, persistent rainfall associated with the Atmospheric River shifted northward across Western Washington on November 13 before stalling over northwest Washington November 14 through 16. Another 5 to 10 inches of rainfall fell across the northern half of western Washington. The snow level rose to 8000 to 10,000 feet, resulting in some snow melt contributing to runoff.  Widespread minor or greater flooding occurred. Major flooding occurred on the Bogachiel, the three forecast points on the Nooksack, Skagit, and Cowlitz Rivers. Moderate flooding occurred on the Elwha, Skokomish, Skykomish, Snohomish, Snoqualmie, Puyallup, Nisqually, Newaukum Rivers and South Prairie Creek. Preliminary record flows occurred on Nooksack, Bogachiel, Calawah Rivers and Olsen Creek. Hundreds of water rescues and two fatalities took place during this time period. The heavy rainfall also triggered numerous landslides due to loading on the already-saturated soils.
Much of the reported damage amounts were for both episodes in November and some of the amounts for this episode were an estimated proportion for the month.

Heavy Rain in WHATCOM, WASHINGTON
From 15-NOV-21 17:00:00 to 15-NOV-21 17:00:00 (PST-8)
Location: ALGER
Property damage: 75.00K
Crop damage: 0.00K
Reported by: State Official

Heavy rain on already saturated soil cause several landslide over I-5 blocking lanes, striking vehicles, and causing collisions. Road damage occurred as well. Damages estimated for vehicles and debris removal. One injury reported.

Flood in SAN JUAN, WASHINGTON
From 15-NOV-21 08:00:00 to 15-NOV-21 20:00:00 (PST-8)
Location: DEER HARBOR
Flood cause: Heavy Rain
Property damage: 475.00K
Crop damage: 0.00K
Reported by: State Official

Heavy rain cause urban and small stream flooding, washing out some roads.

Flood in LEWIS, WASHINGTON
From 12-NOV-21 04:30:00 to 15-NOV-21 05:30:00 (PST-8)
Location: SILVER BROOK
Flood cause: Heavy Rain
Property damage: 526.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Heavy rain drove a several rivers and streams above flood stage. Major flooding occurred on the Cowlitz River and moderate flooding on the Newaukum River.

Flood in SNOHOMISH, WASHINGTON
From 12-NOV-21 09:00:00 to 16-NOV-21 17:30:00 (PST-8)
Location: CEDARHOME
Flood cause: Heavy Rain / Snow Melt
Property damage: 2.42M
Crop damage: 0.00K
Reported by: River/Stream Gage

Heavy rain and snow melt pushed a number of rivers above flood stage. Moderate flooding occurred on the Snohomish and Skykomish Rivers, with minor flooding on the Stillaguamish. Several pulses of heavy rain from the 3 atmospheric rivers sent the rivers above flood levels multiple times during the episode. Urban and small stream flooding also occurred.

Heavy Rain in CLALLAM, WASHINGTON
From 15-NOV-21 12:00:00 to 15-NOV-21 12:00:00 (PST-8)
Location: NEAH BAY
Property damage: 150.00K
Crop damage: 0.00K
Reported by: State Official

Heavy rain on already saturated soils caused several landslides along SR 112, including a large landslide near Sekiu that cutoff the water main to the town. One section of the highway dropped 2 1/2 feet, and other locations were buried in rock, mud, and trees.

Flood in SKAGIT, WASHINGTON
From 12-NOV-21 05:00:00 to 19-NOV-21 12:30:00 (PST-8)
Location: MARBLEMOUNT
Flood cause: Heavy Rain / Snow Melt
Property damage: 12.00M
Crop damage: 0.00K
Reported by: River/Stream Gage

Heavy rain and some snow melt caused flooding throughout much of Skagit County, especially on the Skagit and Samish Rivers. Flooding on the Skagit started on the 12th, then temporarily dropped below flood stage, before rising to major flood on the night of the 14th. 2 fatalities occurred during this time with many road, highways, and bridges  closed due to water over roadway, washouts, sloughing, and debris. Town inundated including Rockport, Hamilton, Lyman, Sedro Woolley, and Mount Vernon.  There was urban and small stream flooding as well on the 15th.The heavy rain also triggered a number of landslides throughout the area. Damages are reported and estimated; not all damages have been identified. Crop damages are unknown.

Flood in CLALLAM, WASHINGTON
From 14-NOV-21 09:15:00 to 16-NOV-21 00:00:00 (PST-8)
Location: MT PLEASANT
Flood cause: Heavy Rain / Snow Melt
Property damage: 5.50M
Crop damage: 0.00K
Reported by: River/Stream Gage

Heavy rain and some snow melt caused flooding throughout much of Clallam County, especially on the Bogachiel and Elwha Rivers. Flooding reached major severity and preliminarily a record stage. Many road, highways, and bridges  closed due to water over roadway, washouts, sloughing, and debris. There was urban and small stream flooding as well on the 14th - 15th. The heavy rain also triggered a number of landslides throughout the area. Damages are reported and estimated; not all damages have been identified. Crop damages are unknown.

Flood in WHATCOM, WASHINGTON
From 14-NOV-21 12:00:00 to 17-NOV-21 11:00:00 (PST-8)
Location: WICKERSHAM
Flood cause: Heavy Rain / Snow Melt
Property damage: 34.00M
Crop damage: 0.00K
Reported by: River/Stream Gage

Heavy rain and some snow melt caused flooding that exceeded major severity on the South Fork Nooksack River and mainstem Nooksack River at North Cedarville and Ferndale. There was urban and small stream flooding as well, hitting Bellingham especially hard. The heavy rain also triggered a dozen landslides throughout the area. Significant flooding on the Nooksack River also overflowed at the City of Everson to the degree that flood waters flowed north along an old Nooksack floodway and Johnson Creek where it flooded the cities of Everson and Nooksack, WA, then combined with flooding from the Sumas River and flooded the City of Sumas, WA where over 85% of homes sustained water damage. Damages are reported and estimated; not all damages have been identified. Crop damages are unknown.