It is cold again in Port Alberni, but if you are in the City you are only just feeling it now! There has been a surprising difference in temperature between the Valley (Airport) and City of Port Alberni most of last night and into this morning that then suddenly changed.
Here is the Airport over the past 24hrs.
Notice it has been nearly -10°C since 9PM last night and the humidity has not changed at all.
Now look at the Alberniweather station:
The temperature was just 0 as late as 6AM this morning and then dropped suddenly.
I checked the Alberni Elementary station to see if it was just something weird on my station and the same phenomenon appeared.
The graphs for my station don’t include Humidity for some reasons (will have to work on that) but the Alberni Elementary station shows that the temperature dropped at the same time as the humidity went up from around 50-60% to 90%.
What is the explanation for this switch? I am honestly not sure. Maybe I will be able to find out with others around the weather world.
Possible Snow starting Friday morning
The thing we are all watching for is what happens when this cold snap inevitably lifts and moisture comes in from the Pacific.
That looks set to happen starting Friday morning as a weak bit of moisture drifts down from the North island, reaching us between 4-7AM on Friday morning.
This is likely to be light snow at best but also the most likely to stay cold, and thus snowy. It is expected to have a threat of snow most of the day Friday and pull away from the area by Friday night.
A more significant system is expected to arrive midday Saturday.
It will spread rain or snow across the island Saturday afternoon, be most intense in the evening and night and then linger through all of Sunday.
How much falls as snow or rain will be completely dependant on local conditions, cold air pockets, elevation, etc.
At this point the Environment Canada forecast seems to be leaning more toward snow.
The UWash forecast however has a little pocket in the Alberni Valley for the 48 hours on the weekend showing very little snowfall.
No matter what, be prepared for treacherous and very changeable driving conditions if you are on the highway Friday, Saturday and Sunday.
We’ll see where this forecast goes by Friday morning!