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December 14/15 winter storm threat


Typhoon Tip

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Not sure if the surface temps are as cold as they were showing earlier.  But, I'm thinking it might stay in the teens today (actually, I was at 21 at midnight, damn it).  Just went out to get wood for the stoves--man it's chilly and breezy.  Getting some snow in when it's like this would be pretty fun.

 

18.5/0

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Chance is negligible. I'd put it at under 5% right now for CT. Maybe somewhere up on the seacoast of NH or something could get some enhancement and have a slightly higher shot.

 

Hard to do it with a thump of warm advection snows. I never really forecast double digits unless you're looking at a solid mid level low and can crank some frontogenesis/deformation in the comma head. 

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The NAM and GFS soundings support a lot of freezing drizzle in NCT after the main thump, that I think might be a bigger problem than currently talked about.

 

Models tend to overdo that though on NW winds as the low winds up. It's really tough to get FZDZ in here on NW winds... generally dry out enough to prevent it from becoming an issue. 

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Need more posts like this. Features that determine what ultimately verifies. To some maybe already learned and reinforced.

John (Tip) sniffin this out a week before hand. Kudo's  

Curious as to what John is thinking now? Might be already covered but I'll say this again and again. We are probably one of the best regions to be covered by so many knowledgeable Mets and amateurs.    

 

 

The signal for this system did mute some over the last 4 days.  The PNA's rise evolved a little less obvious.  The PNA domain is huge, though.  Small changes therein ...probably mean less to details in the flow.  However, in this case, seeing somewhat less meridian flow, and flatter faster less phased stream interaction, became supported. That all said, there is still a signal there; it's just not as obvious.  A light to moderate event (by local standards for sensible impact) is acceptable. 

 

But there is another aspect here.  The S/W that becomes the southern stream impulse is between the GOA and the west-coast.  People like to argue that data-assimilation is no longer a modeling concern for the input grids, but ... until NCEP completely signs off on that, I am willing to give a nod to systems having some uncertainty when passing through some known regions of the Pacific.  NCEP has not signed off on that, and routinely they mention assimilation/sparesness concerns.  That said, it should be moving into a denser sounding domain over the next 24 hours; it probably won't matter, but we have seen systems beef back up, or down, when that relay off the Pac takes place.   

 

I will say, there is a kind of annoyance about pulling systems out of the ether some days ahead in that the hurry-up-and-wait affect kicks in, and it becomes a thumb twiddle. Then for those that get emotively invested, the time-track that leads up to the event becomes a roller-coaster ride as each successive model run ups this or downs that.  I try to stay clear of that.  I would be a liar if I said I did not care weather there were snow for Christmas, because I was raised in a northern latitude and it is endemic to my upbringing (enough so to have a foundation in sentiment).  But I won't allow it to affect my mood, just the same.

 

I digress... I do think it is odd that a weaker system is placed farther NW.  The NAM is likely biased on that 00z POS run... But then the UKMET comes in NW, huh... weird.  One would think that a flatter progressive system with a antecedent slab of molasses air setting into the region would make those NW solution full of crap.  We'll see.  Plus, though the S-stream is hard to identify, what's left of the v-max still goes over or a hair SE of SNE, so I don't see putting a 700mb circulation NW of that track.  

 

Now watch ... some narrow band get S++ thundersnow

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