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Winter 2011-2012 Kickoff Thread | December 2011


earthlight

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Trials,

Maybe this is the one you were talking about for the time frame of the 25-28th, just delayed a couple of days. Half kidding here, but desperately looking for something to talk about, the Euro control run that goes out to 360 hrs shows a developing low over northeastern North Carolina at 360 hrs that is coming right up the coast, possibly just off the coast. There is a weak 1026 mb high centered in the right spot over southwestern Quebec, north of Lake Ontario but weak as I stated, and the low is defintiely coming up the coast, having traveled from central South Carolina to northeastern North Carolina, just south of Virgina Beach. The 850's are about -4 at NYC and the 850 line is near Atlantic City. .25 precip has already fallen in NYC by 360 hrs with MUCH more to come. It is difficult to tell whether we would thread the needle on this one, but anyway, there is the play by play on a storm at 360 hrs on the control run of a model. How desperate is that for something to talk about? Anyway, yes 360 hrs is New Year's Eve at 7pm.

While generally I think these types of posts are better kept to a banter thread because they are so far out, its good to keep the serious threads a foot. I really like what I have seen the past few days being modeled in the long range on the other side of the globe as we are seeing heights rising which is helping push the PV south and east which is helping us cool down over the east Also, looks like we see some real ridging out west, not off the coast. I am excited about the 25-28th time frame. Here it is on the euro ensembles

Also notE the ridging over the top of greenland, its by no means a -NAO, but it may help to keep the cold air anchored in and slow down the pattern just a little

12zECMWFENS500mbHeightAnomalyNH216.gif

12zECMWFENS500mbHeightAnomalyNH240.gif

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Difference in departures from the last 4 days shows that almost the entire central and eastern US warmed up - with no significant below average temps sticking out in the long range as shown in the post above this one, there doesn't seem to be much to prevent December from ending up as a complete torch compared to average with widespread 6+ degree departures in the Northeast.

post-1753-0-64588100-1324132758.gif

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1st run all winter where a model has shown well below normal temps for an extended period in the medium range.

Gfs has significantly cooled in the medium range of days 5-10 and the cold also extends into fantasy range as well.

Let's hope it's a start of a pattern change and not just 1 false run of the Gfs.

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1st run all winter where a model has shown well below normal temps for an extended period in the medium range.

Gfs has significantly cooled in the medium range of days 5-10 and the cold also extends into fantasy range as well.

Let's hope it's a start of a pattern change and not just 1 false run of the Gfs.

It also shows 2 opportunites for a storm near Christmas.

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The GFS, starting at 0z last night, has been more agressive with driving up higher heights over the arctic. Although we dont have a perfect block over greenland, it is enough to dislodge portions of that death vortex thats been sitting and spinning over the DS.

This is why we see more cold oubreaks in the middle-longer range, the arctic is finally freeing up some of its bounty.

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The GFS only gets our temperatures down to normal for Christmas weekend. The Arctic air stays up closer to SE Canada.

It has NYC making a low of 30 degrees off the raw data.

I'd caution against putting too much into 168 hr GFS 2m temps....

The overall pattern does support colder than average temps looking at the trough orientation, etc.

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I'd caution against putting too much into 168 hr GFS 2m temps....

The overall pattern does support colder than average temps looking at the trough orientation, etc.

Well the GFS had low to mid 20's for the low on the 11th from a week out and NYC only made 29 degrees.

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