A significant snowstorm impacted the lowlands of Washington beginning during the evening hours of February 12 and continuing through the morning of February 13. Strong Fraser outflow was responsible for the advection of much colder air west of the Cascade Crest. As this cold air entrenched the Western Washington lowlands, a strong storm system was approaching from off the Pacific, bringing with it sufficient moisture towards the area. The low made landfall near the mouth of the Columbia River during the early morning hours of the 13th, which was the prime location to allow for significant snowfall over Western Washington. Heavy snowfall accumulated quickly overnight and continued through the morning of the 13th before tapering during the afternoon and evening.

Winter Storm in WESTERN WHATCOM COUNTY, WASHINGTON
From 13-FEB-21 00:00:00 to 13-FEB-21 08:00:00 (PST-8)
Reported by: CoCoRaHS

Snow began to spread across Western Whatcom County during the late overnight period of February 12 into February 13th. Local CocoRaHs observations by daybreak on the 13th showed generally 3-5 inches of new snow across the western portion of the county. Snow would then taper through the afternoon, with generally minimal additional accumulation.

Winter Storm in SAN JUAN, WASHINGTON
From 13-FEB-21 00:00:00 to 13-FEB-21 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A significant winter storm brought heavy snowfall to the San Juan Islands late in the evening and into the overnight period from February 12 to February 13. Local CoCoRaHs reports around daybreak on February 13 ranged from generally 5-10 inches of snow through that short time period.

Winter Storm in WESTERN SKAGIT COUNTY, WASHINGTON
From 12-FEB-21 22:00:00 to 13-FEB-21 08:00:00 (PST-8)
Reported by: CoCoRaHS

A significant winter storm impacted Western Skagit County late in the evening hours on February 12 and continued through the overnight and morning period of February 13. Some areas within the County recorded around 8-9 inches of new snow in a 12 hour period.

Winter Storm in ADMIRALTY INLET AREA, WASHINGTON
From 12-FEB-21 22:00:00 to 13-FEB-21 08:00:00 (PST-8)
Reported by: CoCoRaHS

A significant winter storm impacted the Admiralty Inlet area beginning during the late evening hours of February 12 and into the morning hours of February 13. Most locations received less than 4 inches in a 12 hour period (generally 1-3 inches area-wide), however, a few locations on Camano Island received 4 inches, mainly on the northern side of the island.

Winter Storm in BELLEVUE AND VICINITY, WASHINGTON
From 12-FEB-21 19:00:00 to 13-FEB-21 10:00:00 (PST-8)
Reported by: CoCoRaHS

A major winter storm impacted the Bellevue area beginning during the late evening hours of February 12 and continuing through the morning hours of February 13. Within a 12 hours period, many CoCoRaHs reports ranged from 5-9 inches. Snow then slowly tapered through the afternoon and evening hours with little additional accumulation.

Winter Storm in BREMERTON AND VICINITY, WASHINGTON
From 12-FEB-21 19:00:00 to 13-FEB-21 10:00:00 (PST-8)
Reported by: CoCoRaHS

A major winter storm impacted the Bremerton area beginning during the late evening hours on February 12 and continuing through the morning hours of February 13. Within a 12 hour window, many local CoCoRaHs stations reported new snowfall totals in the 6-10 inch range. Light snow would continue through the afternoon and gradually taper into the evening, with little additional accumulation.

Winter Storm in EVERETT AND VICINITY, WASHINGTON
From 12-FEB-21 19:00:00 to 13-FEB-21 10:00:00 (PST-8)
Reported by: CoCoRaHS

A major winter storm impacted the Everett area/western Snohomish County during the late evening hours of February 12 through the morning hours of February 13. In roughly a 12 hour window, many local CoCoRaHs stations reported new snow accumulations of between 4-7 inches. Snow continued through into the afternoon hours and gradually tapered, with little additional accumulation.

Winter Storm in HOOD CANAL AREA, WASHINGTON
From 12-FEB-21 18:00:00 to 13-FEB-21 10:00:00 (PST-8)
Reported by: CoCoRaHS

A significant winter storm impacted the Hood Canal area beginning during the evening hours of February 12 and continuing through the morning hours of February 13. Local CoCoRaHs observations around sunrise on February 13 suggested new snowfall totals ranging from 4-12 inches along the Canal vicinity. Snow would continue into the afternoon while gradually tapering. Little additional snow accumulation was reported.

Winter Storm in LOWER CHEHALIS VALLEY AREA, WASHINGTON
From 12-FEB-21 16:00:00 to 13-FEB-21 08:00:00 (PST-8)
Reported by: CoCoRaHS

Significant snowfall impacted the Lower Chehalis Valley beginning during the late afternoon and early evening hours of February 12 and continuing through the overnight period into February 13. Snowfall amounts during this general timeframe ranged from between 5-9 inches. Snow gradually tapered into the afternoon hours on February 13, with little additional snowfall accumulation thereafter.

Winter Storm in SEATTLE AND VICINITY, WASHINGTON
From 12-FEB-21 19:00:00 to 13-FEB-21 10:00:00 (PST-8)
Reported by: CoCoRaHS

A major winter storm impacted the Seattle area beginning during the late evening hours on February 12 and continuing through the morning hours on February 13. Local CoCoRaHs observations indicated new snowfall totals in the 4-10 inch range. Snow continued through the afternoon hours while gradually tapering. Little additional snowfall accumulation was reported.

Winter Storm in SOUTHWEST INTERIOR, WASHINGTON
From 12-FEB-21 17:00:00 to 13-FEB-21 10:00:00 (PST-8)
Reported by: CoCoRaHS

After receiving several inches of light snow on February 11, a much more significant winter storm affected the Southwest Interior, beginning during the late afternoon and early evening hours on February 12 and continuing through the morning hours of February 13. Local CoCoRaHs observations indicated new snowfall totals from the 12th into the 13th of generally 8-11 inches.

Winter Storm in TACOMA AREA, WASHINGTON
From 12-FEB-21 18:00:00 to 13-FEB-21 10:00:00 (PST-8)
Reported by: CoCoRaHS

A major winter storm affected the Tacoma area beginning during the evening hours of February 12 and continuing through the morning hours of February 13. Local CoCoRaHs observations indicated new snowfall amounts of between 6-8 inches. Snow continued through the morning hours before gradually tapering. Little additional snowfall was reported.