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December 2017 Discussions & Observations Thread


Rtd208

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18 hours ago, donsutherland1 said:

Mr. Noll included 1992-93. Winter 1992-93 was a neutral ENSO winter, not a La Niña winter. Of course, if one excludes this non-La Niña winter, the composite is somewhat different from what the map shows (much less of a trough in the west and somewhat less expansive ridging in the East).

Further, January 2011 featured a trough in the means in the East and a ridge in the means in the West, almost the opposite of what the posted map is showing.

You really can't reach any conclusions with his six analog list regarding snowfall, three of them featured well above normal snowfall in NYC.

 

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2 minutes ago, bluewave said:

Just that the NAO has been in the most positive extended December state on record since 2011. Notice how we set a record low and then a high within 2 years. This type of extreme behavior is something new for us.

IMG_0031.PNG.a33cf7905f55115ff860f16941d25145.PNG

 

We're also seeing extremities in Pacific blocking.  The massive ice melt could definitely be the cause of it.  Some models predicted this would happen.

 

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14 minutes ago, bluewave said:

It matches the corals study results in 2009 with the more extreme NAO behavior.

The oceans are becoming massive heat sinks for the warming (this could also result in the "Ridiculously Resilient Ridge" in the West.)  Also carbon dioxide makes water more acidic and warmer resulting in coral reef bleaching as the reefs expel their algae.  The Great Barrier Reef will likely be gone within 20 years or less, resulting in a massive imbalance to the marine ecosystem.

 

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3 minutes ago, bluewave said:

it will be interesting to see if there is a big mixed precip or ice event near the Appalachians close to Christmas. Probably not what people want to see with all the traveling going on then.

 

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If you had to guess, Chris do you think we'll see anything significant in the Dec 23-Jan 1 period or does it look like more overrunning mix to rain events for us and snow to ice events for the Poconos? If so, that's where I will be for the last 10 days of the month!

 

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4 minutes ago, bluewave said:

Before and to Christmas it looks like interior regions are favored for the best mixed or ice potential. Maybe after Christmas the boundary can slip east of us. But it's too early to tell now.

Thanks!  Frequent events or something closer to average (something like one event per week)?

 

 

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it will be interesting to see if there is a big mixed precip or ice event near the Appalachians close to Christmas. Probably not what people want to see with all the traveling going on then.

 

 

 

eps_t2m_anom_conus_252.thumb.png.d83e55a62e7f52c0278eff3fdde9897c.png

 

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Wont take much shifting for that sprawling HP in Canada to seep a little farther S and E causing CAD based on those maps. Only need a small wedge for huge problems. Glad it is a ways out there. Definitely something to watch with activity in the stj.

 

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8 minutes ago, bluewave said:

Before and to Christmas it looks like interior regions are favored for the best mixed or ice potential. Maybe after Christmas the boundary can slip east of US. But it's too early to tell now.

Going into Christmas, the -EPO is there but the PNA goes negative, AO goes neutral, NAO goes positive, and the SE ridge flexes and possibly really flexes for a time. This will favor central and northern interior New England (ice/snow/overrunning), at least through Christmas, there are signs this may relax after Christmas and the boundary drops further south, but that’s very long range

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42 minutes ago, snowman19 said:

Going into Christmas, the -EPO is there but the PNA goes negative, AO goes neutral, NAO goes positive, and the SE ridge flexes and possibly really flexes for a time. This will favor central and northern interior New England (ice/snow/overrunning), at least through Christmas, there are signs this may relax after Christmas and the boundary drops further south, but that’s very long range

Yes and these things are usually delayed, so it might be more like the first week of January when that happens.

 

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1 hour ago, snowman19 said:

Going into Christmas, the -EPO is there but the PNA goes negative, AO goes neutral, NAO goes positive, and the SE ridge flexes and possibly really flexes for a time. This will favor central and northern interior New England (ice/snow/overrunning), at least through Christmas, there are signs this may relax after Christmas and the boundary drops further south, but that’s very long range

These features are also weakening more in general over the last 24 hours on majority of the ens. Huge EPO still evident with bridge over top and a -AO. SW trof or your -PNA is fading or smoothed out. SE Ridge is there but not really bulging North.....more elongated. Also showing as slightly weaker. Climo certainly favors the areas you mention and I wont disagree with that. But with a massive sprawling HP trying to ooze out of Canada, it will depend on where the gradient sets up. I do see at LEAST 1 cutter style system next week which is the catalyst to really reload things headed towards Christmas and the week following.

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10 minutes ago, Ralph Wiggum said:

These features are also weakening more in general over the last 24 hours on majority of the ens. Huge EPO still evident with bridge over top and a -AO. SW trof or your -PNA is fading or smoothed out. SE Ridge is there but not really bulging North.....more elongated. Also showing as slightly weaker. Climo certainly favors the areas you mention and I wont disagree with that. But with a massive sprawling HP trying to ooze out of Canada, it will depend on where the gradient sets up. I do see at LEAST 1 cutter style system next week which is the catalyst to really reload things headed towards Christmas and the week following.

As depicted, any storms, if cold enough in the low levels, would be an ice storm/freezing rain setup, not a snowstorm setup, isentropic event, at least through Christmas. I hope not, ice storms are the worst

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4 hours ago, Paragon said:

Based on your analysis, Don, that means there were several winters that were more favorable for snowfall than 1995-96 was, but for some reason or other, those patterns didn't fully reach their potential like 1995-96 did?  Oh and didn't 1955-56 get 39.2" seasonal snowfall? That's what my weather almanac says (maybe they reanalyzed it)?

 

The only storms in 1995-96 that didn't reach their full potential that I can recall were the Dec 1995 storm where NYC got 8" (prediction was for 15-20") but LGA did get 14" in that one.  And the April 1996 storm where 6-12" were predicted and NYC somehow only got 0.7" while JFK got 4.5"

 

Blizzard of January 1996 was more of a case of underreporting at NYC rather than anything else, surrounding stations EWR and LGA both recorded 27-28" and NYC only 20"?!

 

I don't want to say that they were more favorable, but that a number had big potential including but not limited to 1995-96. The coefficient of determination was .62. Of course, a lot of other variables are involved (and it's encouraging to see the GFS showing a stormier pattern in the medium-range and beyond).

I used the NWC's seasonal snowfall chart, which shows 33.2". Of course, the chart has at least one typo, as winter 2015-16 had 32.8" snow, not 32.1".

Like you, I suspect Central Park underreported during the Blizzard of 1996.

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1 hour ago, snowman19 said:

As depicted, any storms, if cold enough in the low levels, would be an ice storm/freezing rain setup, not a snowstorm setup, isentropic event, at least through Christmas. I hope not, ice storms are the worst

ice storms have become rare around here in the past 10-15 yrs...seems it's either big snows or big rains.

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1 hour ago, Ralph Wiggum said:

These features are also weakening more in general over the last 24 hours on majority of the ens. Huge EPO still evident with bridge over top and a -AO. SW trof or your -PNA is fading or smoothed out. SE Ridge is there but not really bulging North.....more elongated. Also showing as slightly weaker. Climo certainly favors the areas you mention and I wont disagree with that. But with a massive sprawling HP trying to ooze out of Canada, it will depend on where the gradient sets up. I do see at LEAST 1 cutter style system next week which is the catalyst to really reload things headed towards Christmas and the week following.

Overall, I am feeling pretty optimistic after last night's runs.  As we head toward the heart of winter, I am more comfortable taking our chances with a gradient-type pattern, which can be fun at times (think 1993-94).  Some help from the Atlantic side would be a plus, but I derive some confidence from the EPO and MJO trends on recent guidance.  All in all, I would be surprised if we did not see at least some more appreciable frozen precip before the month closes.

Interestingly, if my memory serves me right, December 2013 followed a similar, step-down progression which yielded an impressive snow event just after New Years.  Anybody with a better memory/hard data on hand wish to weigh in on the similarity (I could be totally off-base...just musing here).

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2 hours ago, donsutherland1 said:

I don't want to say that they were more favorable, but that a number had big potential including but not limited to 1995-96. The coefficient of determination was .62. Of course, a lot of other variables are involved (and it's encouraging to see the GFS showing a stormier pattern in the medium-range and beyond).

I used the NWC's seasonal snowfall chart, which shows 33.2". Of course, the chart has at least one typo, as winter 2015-16 had 32.8" snow, not 32.1".

Like you, I suspect Central Park underreported during the Blizzard of 1996.

Hey Don I agree on the Blizzard of 96. The snow totals were amazingly consistent here in Fairfield county of 27 inches in Greenwich, Norwalk and Fairfield (except Bridgeport which somehow reported 15). I suspect NYC should have been 27 too given the radar echoes.

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1 hour ago, EastonSN+ said:

Hey Don I agree on the Blizzard of 96. The snow totals were amazingly consistent here in Fairfield county of 27 inches in Greenwich, Norwalk and Fairfield (except Bridgeport which somehow reported 15). I suspect NYC should have been 27 too given the radar echoes.

For a station that chronically under measures, this was the biggest joke of all.  I'm 5 miles from there and we had a good 2 feet here.  

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53 minutes ago, Brian5671 said:

For a station that chronically under measures, this was the biggest joke of all.  I'm 5 miles from there and we had a good 2 feet here.  

That's why it gets me so upset when Bridgeport is used for all CT shoreline references in historical snowfall. What's worse it has a lower snowfall average than NYC which is of course off due to said measurement shortfalls.

Fyi. Fairfield officially had 27 for the 96 blizzard

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