I’ve never seen this for Port Alberni.
It has been issued for our section of the Island only, the Snowfall warning remains for other sections.
Bolded below is the likely reason for the warning.
When 25 cm of snow or more is expected to fall within 24 hours,
Two or more winter weather warning elements (as listed above) are expected to approach or exceed the criteria. For instance, if 10-15 cm of snow is expected to be accompanied by 2 or more hours of freezing rain.