December 2020 Forecasts and Discussions

[Vancouver]

A week out and lots can change, Ive said it every year since we launched in 2008, if the long range is boring we have better odds generally.

[wetcoast91]

10-15cm E Van Island above 100m.
5cm above 100m in the Victoria area
20cm E Cascade foothills
1-3cm PSCZ

[AbbyJr]

Not much precip either with a north or south track due to the orientation of the trough. Just looks like cold light rain if that in the LM.
This will either an Island or Puget Sound event.

Not according to the RGEM, which shows close to 80 mm of rain Monday.

[wetcoast91]

Not according to the RGEM, which shows close to 80 mm of rain Monday.

The RGEM always over does precip amounts.

[Monty]

We are now getting into range on the 0,6,12, and 18Z HRRR. More info for people to agonize over. 12z had a good looking track for the east island

[AbbyJr]

The RGEM always over does precip amounts.

It often does but I have seen it close to if not spot on.

Regardless, split 80 mm in half and it's still a very wet day.

[AbbyJr]

https://twitter.com/SimonLeeWx/status/1 ... 72289?s=19

Mid-late January arctic blast?

[hawk2]

Maybe EC really knows best?
Or is John's predict "surfacing" at exactly the right time?

[wetcoast91]

https://twitter.com/SimonLeeWx/status/1 ... 72289?s=19

Mid-late January arctic blast?

Massive Greenland block in place spells historic arctic blast for Eastern NA if this SSW occurs.

If we see a ridge build off the GOA then watch out....

[Roberts Creeker]

Meh. Cold rain for metro Vancouver.

Oh goodie, more rain!

[PortKells]

Massive Greenland block in place spells historic arctic blast for Eastern NA if this SSW occurs.

If we see a ridge build off the GOA then watch out....

That would be a real kick in the dick. But that seems way too far out to call.

[Storm]

What Euro??? President HRRR has spoken.

hrrr_ref_frzn_nwus_46.png

[Slytyguy]

Oh goodie, more rain!

Looks pretty close, exact track still undecided. Hopefully get something. Not a whole lot of cold air in the interior which doesn't help.

[East Chilliwack]

10-15cm E Van Island above 100m.
5cm above 100m in the Victoria area
20cm E Cascade foothills
1-3cm PSCZ

Is East Chilliwack 880’ east cascade foothills? Or is that 20cm more for the foothills down south?

[PortKells]

On the topic of Sudden Strat warming events...haven't these been in the models since about December 1st? Not to say its not going to happen but until there's unanimous agreement we probably shouldn't be pinning our hopes on something on Jan 3rd on the GFS. Just trying to be realistic here.