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January Medium/Long Range Discussion


WinterWxLuvr
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1 hour ago, mattie g said:

Op GFS has a ridiculously negative AO/NAO in the period around the 20th, and the GEFS height anomalies are impressive for 300 hours out.

GEFS with a big loud DT WOOF for D10 (MLK weekend). -AO/-NAO/+PNA/-EPO and a clear Miller A signal in the MSLP and precip. 

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The ensembles did a damn good job seeing the  frontal wave potential all the way back prior to Christmas for the first 10 days January. 

They highlighted the potential 2 weeks ago.

At that point we weren't sure which side of the boundary we'd be on but the pattern was nailed.

 

 

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23 hours ago, WxUSAF said:

Great thread from @griteateron where mid and late January may lead 

 

I’ve seen some posts by even people I respect a lot implying we return to a strongly -epo because “Nina” which confuses me because that’s not actually an automatic Nina thing. I posted this on Twitter yesterday but it’s every Nina winter mean h5 since 1980. 
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Yea the pac ridge is obvious and the +TNH and I’m not saying that’s a good look for snow here but it’s not necessarily a crazy -pna either. The NAM trough axis is actually more typically more east than it was. 
 

However, pointing out a “typical” Nina doesn’t necessarily translate to the current pac base state.  Also hidden within that are actually 2 different Nina states. When there is a poleward epo ridge it NAO blocking (later in winter!) we tend to see the trough more east in North America. When the pac ridge is flat and or. +NAO we tend to see it west and a -pna and big SE ridge. 
 

I do agree the pac jet retracts and we get a retrogression off the NAM pattern. That’s not bad, that will give us a nice window during prime climo mid January!   After that though I think depends on the high latitudes.  Assuming we revert to the recent pac base state if the epo ridge dissipates and the NAO stays positive then we probably torch Feb. we don’t do slightly warm anymore. Any pattern that favors a ridge in the east means crazy warm anomalies recently. No reason to expect different. But I do think we get another period of high latitude help. Recent trends say it’s unlikely the AO stays positive the rest of winter. I also think the happenings in the pac had a lot to do with the coming +NAO.  analog based pattern progression showed the NAO ridge was likely to retrograde to the pac side. It took longer than expected with the stalled mjo but the expected pattern progression seems to be resumed now. 
 

My best guess is we have to suffer a torch period at some point late Jan or Early Feb before things start to recycle up top. But I do think we get one more chance at snow after. Whether that’s Feb or we have to wait until March I don’t know. As grit eater says it’s all an educated guess at those ranges. But I’m sure it won’t be soon enough for some who start complaining about Sun angle by groundhogs day!  

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33 minutes ago, yoda said:

I made the bad choice of looking at the 850mb temps :(

 

It’s like 2* at day 10 from a big storm. And the euro is often slightly too warm in the cold sector of storms at that range. Showed a big rainstorm day 10 in Jan 2016 also and I made a post about not worrying and that setup as depicted would trend colder assuming the major longwave pattern features were correct. I’m not saying it’s a lock just that worrying about the exact thermal profile on day 10 ops is a total waste of time. 

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Looks like a busy period ahead.  Most likely 3 events in 7 days for the MA.  Ops have plenty of chances throughout the next two weeks.  I do see the dryish look on the ens but wonder how much of that is due to a cluster of members having the entire tpv dropping down for an extended period and crushing everything....skewing things drier on the mean?

 

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2 hours ago, psuhoffman said:

The front is trending less positively tilted and it wouldn’t take much for a wave to develop to bring some snow. Not likely not a threat of a big storm but a sneaky threat worth watching. 

I’m not comparing the two directly, but from range I recall Monday’s event originally showing up as a weak anafrontal wave.

I haven’t been following this at all, but I guess I will now…

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