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Forecasters also say the rain could increase the threat of river flooding in the North Cascades, but the Nooksack River is not currently forecast to reach flood levels.
Major roads closed due to floodwaters include Slater Road between the Ferndale city limits and Ferndale Road, as well as Hannegan Road between Front Street and Polinder Road just south of Lynden.
The NWS has issued flood warnings to communities near the Nooksack River until Tuesday.
Overnight shelters are also operating across Whatcom County.
Buses will attempt to bring home passengers who got on a bus this morning.
Local schools and colleges announce closings due to dangerous road conditions.
WTA canceled services at noon Wednesday, and they are planning to restart Thursday morning on all fixed-route schedules, weather permitting.
Only a small amount of snow is expected after days of speculative forecasts predicting significant snowfall for the region.