NASA satellite image of a 5,000-mile-long moisture plume stretching from China to B.C. image: NASA, October 15th, 2017

“I have been watching the weather in the PNW and around the west for 48 years and that has to be the longest atmospheric river I have ever seen on satellite photos.” ~ NWS Seattle Spotter Pierce 3, today

A 5,000-mile-long plume of moisture (atmospheric river) stretching from China to British Columbia is about to drop somewhere around 28-80″ of snow on the Coast Range of British Columbia including Whistler Blackcomb ski resort, according to forecasts from the GEM, GFS, Snow-Forecast.com, & Whistler Blackcomb’s website.

“A composite NASA image [above] earlier today showing a solid swath of moisture stretching from coastal China to western British Columbia.”- NOAA Seattle, WA today

Somewhere around 18″ of liquid precipitation is forecast for B.C.’s Coast Range in the next 7 days. image: noaa, today

Snow-Forecast.com is forecasting 80″ (204cms) of snow at Whistler’s upper elevations in the next 6 days.
Whistler Blackcomb’s weather forecast page is forecasting 61″ (157cms) of snow at Whistler’s upper elevations in the next 8 days along with some rain.
The GEM weather model is forecasting 68″ of snow for the Coast Range of B.C. in the next 7 days (168 hrs).
The GFS weather model is forecasting 28″ of snow for the Coast Range of B.C. in the next 7 days.

Below are the 4 images supporting the forecasts listed above for Whistler, B.C.