it isn’t, but if we get that -NAO it changes things. not sure if that’s real yet… would like to see more consistency there
unfortunately, i don’t think we’ll see any consistency there
HP is in a good spot... this is why having the NW flow from the -EPO ridge is important. it's not the same as a typical Nina -PNA. LP over the 50/50 region too
what does this have anything to do with the beginning of the month? that's for late January
I agree that we may see -PNA periods mid to late month as the jet retracts, but i wouldn't say that it's favored for the whole month
a trough undercutting a -EPO is not the same pattern as a traditional -PNA. they're two different patterns. early Jan looks more like active split flow with AN heights in northern Canada... that isn't really a -PNA
February 2023 is more of a typical -PNA
i mean, you want AK and Arctic ridging to displace air, and if there is ridging in those areas, it is going to be above normal
hell, if I could have it my way, I would want the North Pole +30 degrees to get all that colder air out and into the US
also, for like the millionth time, northern Canada can be +10 and it won't really matter for us since their normals are so much lower. it's always warm in Canada during Ninos, even in prolific periods
the 500mb pattern trumps things like snow cover. it's more of an enhancer of cold air that's getting funneled in. this year, the cold air that's moving in won't be as cold as it usually is. however, when the 500mb pattern is good like the one coming up, it's not that big of a deal
like the snow cover over Canada won't matter if you're getting flow out of the Arctic. it's just not that much of a pattern driver
same with the -PDO. the PDO is more of a constructive or destructive interferer. it won't have a massive impact on an ongoing pattern