Totally agree with comments about 'local knowledge' and the lack of accuracy of the windy site when it comes to complex waterways.
Douglas Channel is the only channel or inlet cutting into the mainland (other than Howe Sound on Vancouver's doorstep) to have a weather buoy and/or forecasts on BC's whole coast that I know of, so you'd think it would be fairly accurate.
Nanakwa Shoal is 20 Kilometers (14.5 miles) south of Kitimat.
https://weather.gc.ca/marine/region_e.html?mapID=01
Douglas Channel - North Coast - Environment Canada
Maybe I'll start tracking the forecasted vs measured wind speeds at Nanakwa Shoal for the next while, just to get a sense of how much it can actually be trusted...