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November 2013 obs and discussion


usedtobe

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Euro does throw a little precip out with the s/w actually.  Similar to earlier GFS runs and a couple of the 12z GEFS members.  WxBell Euro weenie snow maps even show some over our area :snowman:  GAME ON.  

Mtns do decent. Which I think is pretty much the only realistic thought around here for now. 

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Mtns do decent. Which I think is pretty much the only realistic thought around here for now. 

With more of a clipper idea, would certainly think the Mountains could do well with upslope enhancement and the obviously colder temps.  

 

I find it a bit interesting that the advertised torch keeps getting delayed and delayed.  Looked like it would hit right at the beginning of the month as of mid-late October.  Now we're talking after the 15th.  First half of the month might very well end up a few degrees below normal.  Even with a ++AO/-PNA/+NAO.  I'm not sure if that means the torch will eventually get here (certainly you'd think it would given the state of the indices) or if the torch won't and we'll somehow skate through this should-be-warm-but-its-not period and get a pattern to develop that's more classically wintry for us.  

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18z GFS starts out a little more Euro-ish with a weaker vort than 12z, but catches up and ends up with a pretty solid solution for us.  Vortmax looks to go south of us...near RIC, which is pretty ideal for us.  Low jumps to the coast.  Precip falls in darkness.  Jackpot.  

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18z GFS starts out a little more Euro-ish with a weaker vort than 12z, but catches up and ends up with a pretty solid solution for us.  Vortmax looks to go south of us...near RIC, which is pretty ideal for us.  Low jumps to the coast.  Precip falls in darkness.  Jackpot.  

 

1-3" or whatever this time a year would be bonus. I'd take the euro/gfs compromise in a heartbeat. 

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how often does this 500 map give us a snowstorm in january let alone nov? 

 

 

I actually like November better for cutoffs than January. There's a weaker further north jet in November that is more likely to drop something behind over us.

 

Of course with no blocking the cutoff will have to occur in the right place at the right time for this to happen.

 

However the models do agree there will be a cold enough surface high in the right spot should h5 cooperate.

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The 0z Euro gets very amplified after the weekend with our possible snow event and then another big cutoff low in the central Plains that likely turns into a cutter (and big Plains snowstorm) on the Day 11-13 panels that I can't see. That's why the PNA goes high at the end.  

 

I still think we're in a general -PNA period for the foreseeable future.  Given the dogged persistence of the Aleutian ridging/-EPO, the only way the -PNA goes away is for that ridging to retrograde just enough to get the mean trough OFF of the west coast over the Pacific, which might be able to put a ridge into the Rockies.  In fact, this is what appears to be happening transiently for our possible snow event.  But in general, we're dealing with a -PNA for at least the next 2 weeks I think.  

 

What's pretty amazing to me is that the torch, that by all rights should be coming, just isn't coming.  With a -PNA and a ridiculously +AO (reaching +3-4SD), we're still looking at below normal temps next week, snow or no snow.

 

In fact, I suspect Wes will be mentioning this in his afternoon column on the snow chances.  DC's big snow events are strongly correlated with a -AO and we're looking at a +AO of probably at least 3 standard deviations at the time of this storm.  Vet's Day '87 had a -AO.  So, this storm will have to seriously buck some history and trends (nevermind the fact it's mid-November).  But, of course, even if everyone around DC gets 6", DCA will probably only report <1", so Wes's stats will still be intact and most of us will be happy.  :whistle:

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