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ACUS44 KWBC 060254

SCCNS4



Storm Summary Number 2 for Pacific Northwest Atmospheric River

NWS Weather Prediction Center College Park MD

700 PM PST Tue Dec 5 2023



...Atmospheric river to continue flowing across the Pacific

Northwest through Wednesday morning but will weaken in intensity...



Flood Watches are in effect for portions of western Washington and

western Oregon



Flood Warnings are in effect across portions of the Coastal Range

and the western slopes of the Cascades in Oregon and Washington.



For a detailed graphical depiction of the latest watches, warnings

and advisories, please see www.weather.gov



At 600 PM PST...Regional Doppler radars are indicating widespread

moderate to locally heavy rainfall streaming onshore across

southwestern Washington and northwestern Oregon in the general

vicinity of a stationary front, and lighter rainfall across

interior portions of the Pacific Northwest. Some wind gusts

upwards of 40 mph have also been observed across portions of the

Cascades in western Washington and western Oregon.



...Selected preliminary Storm Total Rainfall in inches from 700 AM

PST Mon Dec 4 through 600 PM PST Tue Dec 5...



...OREGON...

NEHALEM RIVER NEAR FOSS              8.47                    

LEES CAMP                            8.20                    

JEWELL WILDLIFE MEADOWS              5.30                    

TILLAMOOK                            4.21                    

ASTORIA                              3.33                    

LOG CREEK                            3.32                    

PORTLAND INTERNATIONAL AIRPORT       1.17                    



...WASHINGTON...

GRANITE FALLS                        9.85                    

OLYMPIC NP                           8.67                    

HOODSPORT                            7.12                    

QUINAULT 2 NE                        6.99                    

MT BAKER                             6.85                    

ABERNATHY MOUNTAIN                   6.36                    

CUSHMAN DAM                          6.30                    

OWL MT                               6.21                    

HOODSPORT 4 WNW                      5.97                    

GOLD BAR 5 S                         5.90                    

VERLOT                               5.50                    

GOLD HALL                            5.40                    

FINNEY CREEK                         5.14                    

NAVY YARD CITY 1 NW                  5.00                    

SNOQUALMIE 1 NW                      5.00                    

QUILLAYUTE                           4.72                    

BREMERTON 7 WNW                      4.43                    

OLYMPIA                              4.29                    

SEATTLE INTERNATIONAL AIRPORT        3.39                    





The ongoing atmospheric river is expected to persist through

Wednesday afternoon as the Pacific cold front slowly moves inland.

 Although the heaviest rainfall has already occurred with this

event, an additional 1 to 3 inches of rainfall is expected, with

locally higher amounts, which will maintain an excessive rainfall

threat through Wednesday morning along the Oregon coastline and

the coastal ranges, and also along the Cascades given the degree

of saturated soils in the area owing to recent heavy rainfall. For

more information regarding the latest Excessive Rainfall threat,

please visit wpc.ncep.noaa.gov.



The next Storm Summary will be issued by the Weather Prediction

Center at 700 AM PST. Please refer to your local National Weather

Service office for additional information on this event.



Hamrick

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