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Late February will be rocking. February Long range Discussion thread


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4 minutes ago, cbmclean said:

2019 was a moderate Nino wasn't it?  I remember there being debate about whether it was a modoki or not.  Either way, results were the same: SER and WAR ruled the roost.

It was some sort of Nino, but I don't recall the strength. It was weird and the atmosphere acted more like a Neutral iirc. I don't think it was a modoki though.

I brought up 2016 because of the NAO block, and it produced a big storm.

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2 hours ago, CAPE said:

As modeled, the SPV is not a happy camper by the end of the month. What impacts that will have on our sensible weather going forward remains to be seen. Looks plenty cold across Canada on the means, but the h5 response we want is for the AO and NAO to trend negative in order to get the cold further southward and the shift the boundary to our south. Seeing that idea to some degree on the GEFS, as well as some of the extended products.

1677456000-IFzgEcfsDHc.png

That modeled 10mb would correlate to -NAO tendency March 8-15. 

Last year we had a pretty strong +NAO at that time, and we have been reversing lasts years pattern more than mathematical average, so it fits. 

I would not be surprised if a +EPO/-PNA occurred at the same time as a downwelling -NAO. 

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43 minutes ago, Ralph Wiggum said:

Consistent signal still showing up after the 20thgfs_mslp_pcpn_frzn_eus_44.thumb.png.6a93a324f2170acbe601ed68d0d31f73.png

Not consistent across guidance, and only a weak signal on the GEFS to this point. That said, the advertised h5 look starts to improve around this time so not out of the question there could be something trackable towards the 25th. 

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GEFS has been incrementally moving away from improvements in the HL over the last few runs. EPS has only been slightly hinting. Without some AO/NAO help it's going to be difficult to get the actual cold air down here and shift the boundary to our south for more than 5 mins. The ens means range from slightly below to slightly above avg temps around the end of the month. If our last best chance is end of Feb into early March, we are going to need better than that. 

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57 minutes ago, Ralph Wiggum said:

Chuck says that's very warm tho :blink:

I'm with @CAPE...not a torch but not severe cold either. But if we can get that Scan ridging to extend into the NAO that could become a very cold look really quickly. 

Very weak signal for frozen on the EPS between the 20th-27th. Quite different than the GEFS.

eta- that h5 look is one that could work if we are super lucky with timing as cold is on the doorstep.. otherwise with the typical bad luck, it's probably more of the same.

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