By 1pm, snow reported in the east Whatcom County areas had made its way to the Custer area.
Slick roads would be the likely cause of several vehicles off the road on I-5 around the Grandview Road interchange and one vehicle that ended up halfway submerged in an overflowing ditch alongside Portal Way, south of Grandview.
A snowplow could be seen clearing I-5 in both the southbound and northbound lanes north of the Grandview interchange.

By 2pm, northbound I-5 was backed up from Portal Way to past the Custer Rest Area due to lane closures as workers retrieved multiple vehicles from the side of the road and the median.

Update 4:30pm
If you have been working inside or been in Bellingham most of the day, you may be surprised at what you may encounter during your evening commute.
Slater Road has been impacted by surface water flooding and, while still open, the speed just east of the Nooksack River bridge has been reduced to 5mph.
Other roads currently with water and debris over the roadway include (all remain open to traffic):
- Chief Martin south of Scott Road and between Scott and Cagey
- Douglas Road east of Elder
- Ferndale Road north of Marine Drive and north of Slater Road
- Imhof Road north and south of Ulrich Road
- Barr Road north of Mountain View Road
- Hovander Road north of W Smith Road
- Lake Terrell Road north of Mountain View Road
- Lampman Road west of Haxton Way
- Marine Drive west of Ferndale Road
- N Star Road north of Mountain View Road and north of Aldergrove Road
- Nielsen Road near the entrance to Hovander Homestead Park
- Ulrich Road between South Church and Imhof Road
- W Smith Road east of Northwest Road and west of LaBounty Drive
- Portal Way south of Grandview Road
I-5 has cleared up after multiple crashes this afternoon.
Approaching an inch in Pacific Highlands.