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December Forecast Discussion


REDMK6GLI

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You can buy the Euro ensemble LR at your own risk . We are running through phase 4 this week and we DO NOT TORCH .

Next week we head into phase 5  and here`s a new trough coming through the lakes . This is the old 360 from last Monday valid 0Z Tues for the 9th .

Check out the new trough that swings through during that time and 12 hours later .

 

The model has serious problems in the LR on the EC . Do we warm sure , but how much and how long . This Torch is a mute period . As long as that PNA is positive  you are goin to see the models miss these renegade troughs coming through the lakes .

 

That trough will look deeper as we get closer .

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You can buy the Euro ensemble LR at your own risk . We are running through phase 4 this week and we DO NOT TORCH .

Next week we head into phase 5  and here`s a new trough coming through the lakes . This is the old 360 from last Monday valid 0Z Tues for the 9th .

Check out the new trough that swings through during that time and 12 hours later .

 

The model has serious problems in the LR on the EC . Do we warm sure , but how much and how long . This Torch is a mute period . As long as that PNA is positive  you are goin to see the models miss these renegade troughs coming through the lakes .

 

That trough will look deeper as we get closer .

thats all you need is perfect timing when one of those big old arctic highs are in the right position in southern Canada for a few days feeding just cold enough air down this way  and a southern stream system gets close enough and attacks it to produce a snow event around here .........

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thats all you need is perfect timing when one of those big old arctic highs are in the right position in southern Canada for a few days feeding just cold enough air down this way  and a southern stream system gets close enough and attacks it to produce a snow event around here .........

Agreed. Beats cold and dry

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Long range models converging on the classic +EPO/+PNA pattern for the 6-10 and 11-14

day forecasts. Notice how well the model forecasts agree with the composite. This is going

to be a textbook December El Nino pattern through at least midmonth.

So then how did things usually progress afterwards and are we along the same lines as say 2002.

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Agreed looks like post dec.15-20th may give us our hope for our first met winter widespread over the tristate area including the coast

My first snowfall in the winter of 2010-2011 was the boxing day storm.  Not every winter is going to arrive early. Patience is the key.

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Today I noticed the first crack (shades of blue---those reds wanted to burn a hole in my screen)  in the Stormvista CFS weeklies.   But so far we will have to wait till the last 10 days of the month/year to enjoy these benefits.   Possibly this 'blue intrusion'  can back up to mid-month since today may have been the start of a trend.  

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My first snowfall in the winter of 2010-2011 was the boxing day storm. Not every winter is going to arrive early. Patience is the key.

I actually wonder if it ends up being a 06/07 late start in February. I know that year was one of the only ones where the above normal Eurasian October snow correlation to winter didn't really work.

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Most Winters in this area we don't even consider accumulating snowfall before Christmas. Think of December the same way you do of June. You wouldn't expect excessive heat in early June, but if it happened it wouldn't be a shock. We have a long way to go. The heart of the snow season doesn't really begin for another 3-4 weeks, just look at climo if you disagree.

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I actually wonder if it ends up being a 06/07 late start in February. I know that year was one of the only ones where the above normal Eurasian October snow correlation to winter didn't really work.

2 sleet storms that winter with only 10 inches of snow for the whole winter. No thank you.

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Most Winters in this area we don't even consider accumulating snowfall before Christmas. Think of December the same way you do of June. You wouldn't expect excessive heat in early June, but if it happened it wouldn't be a shock. We have a long way to go. The heart of the snow season doesn't really begin for another 3-4 weeks, just look at climo if you disagree.

NYC averages around 5 inches for December

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Since the Winter of 1950-1951 Central Park has only recorded December monthly totals of 5.0" or more 22 times or 22 times in 64 years.

 

What the data indicates is that there is no correlation between a snowy December and seasonal snowfall totals.

 

77-78' only had 0.4" in December and the season total was 50.7".

 

On the other hand 95-96' had 11.5" in December and 75.6" on the season (#1 all time)

 

Very few seasons have had above average snowfall from bookend to bookend.

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Since the Winter of 1950-1951 Central Park has only recorded December monthly totals of 5.0" or more 22 times or 22 times in 64 years.

 

What the data indicates is that there is no correlation between a snowy December and seasonal snowfall totals.

 

77-78' only had 0.4" in December and the season total was 50.7".

 

On the other hand 95-96' had 11.5" in December and 75.6" on the season (#1 all time)

 

Very few seasons have had above average snowfall from bookend to bookend.

 

 

 

A snowless December is a very bad sign, namely, totals of < 3.0" in Central Park. Most winters were sub normal snowfall wise if December was under 3", while > 3" Decembers tended to be near or above normal. Years like 1977 and 2004 are the exception rather than the rule.

 

The last 10 days or so of December tend to be fairly decent during our good/snowy winters.

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A snowless December is a very bad sign, namely, totals of < 3.0" in Central Park. Most winters were sub normal snowfall wise if December was under 3", while > 3" Decembers tended to be near or above normal. Years like 1977 and 2004 are the exception rather than the rule.

The last 10 days or so of December tend to be fairly decent during our good/snowy winters.

IMO given the poor pattern for snow overall in the next 10-15 days it may actually reload in time for a possible rare white christmas then. December 20th period and on has given us some notable to occasional historic snowstorms in the NYC area. One thing to keep in mind and to aid in quelling the punters for winter in our area isotherm. By no means are we out snow chances in the next 10-15 days either, with frequent transient troughs all you need is a well timed one with a disturbance from the south and boom a storm on the EC like last week

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A snowless December is a very bad sign, namely, totals of < 3.0" in Central Park. Most winters were sub normal snowfall wise if December was under 3", while > 3" Decembers tended to be near or above normal. Years like 1977 and 2004 are the exception rather than the rule.

 

The last 10 days or so of December tend to be fairly decent during our good/snowy winters.

I highly doubt it's going to be a snowless December. It only takes one event to put us near average, or even above average. We may have to wait until mid-month, and maybe even a bit later. Patience is the key.

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I highly doubt it's going to be a snowless December. It only takes one event to put us near average, or even above average. We may have to wait until mid-month, and maybe even a bit later. Patience is the key.

 

 

Agree, and I'd be shocked if NYC has less than 3" this month.

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The 12z ECMWF ensemble mean keeps the Polar Vortex situated north of Hudson Bay through at least mid-month. That's a problem because it keeps lower heights over Greenland with the best ridging over the open Northern Atlantic. We need the Polar Vortex to retrograde further southwest which will allow higher heights to develop closer to Greenland. If that transpired, we would actually enter a rather favorable blocking episode.

 

As is, most of the real cold air is going to be situated in northern Canada.

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