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Models Advertising Late Month Storm And Cold Front


bluewave

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Well we saw some good snows fall and we even got a light dusting a couple years ago in late October, first time I ever witnessed October snow in NJ, and last year I saw a few wet flakes and sleet as well. Almost seems like it's easier to see frozen precip in October than late March, early April.

Late March,early April have had some major snowstorms,even on the coast..October has had none

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The DGEX has been pretty useful to me over the past several years in picking out trends among medium term guidance. The model is deemed completely useless by a moderately large portion of the weather community, which in itself is a mistake. It is prone to wild swings in it's solutions, but you have to know how to understand what it's trying to tell you. Such is the case with all forecast models, really, but the DGEX especially.

It's certainly not my model of choice, nor do I blend it into my forecasts very often, but I will tell you this much. I have seen it pick out a storm threat, a thunderstorm event, and a huge heat ridge over a week in advance. With the heat ridge specifically..it was within 2-4 degrees of the observed temperature at over 120 hours out. Pretty impressive if you ask me. I've also seen it go absolute bat-sh** crazy with non-sensical solutions.

If you don't believe me, ask any of the people who have been posting on this board for three-four years. I post the DGEX when it shows something awesome--and there are witnesses here who have seen it verify.

So take it for what it's worth.

Been following it for couple years. I think it's about as useful at the GGEM. It develops almost everything. So it's likely to verify every about 1 out of 10 times.

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Been following it for couple years. I think it's about as useful at the GGEM. It develops almost everything. So it's likely to verify every about 1 out of 10 times.

The 6z Dgex lost everything.

1st storm looks like GFS. Cold front.

2nd storm is way offshore, like the GFS.

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This post gave me goosebumps lol. It read like we were just discussing a storm and this was December.

this is a nice warmup, gets everyone into tracking mode. If we avoid IMBY posts and silly predictions, we can have good disco and the newbies can learn about 850 temps, 925 temps, surface temps, patterns, etc.

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H5 is still digging at 84 hours on the NAM.

To an extent, but the window for getting frozen precipitation to the immediate suburbs is quickly passing by 84 hours on the 12z run. Notice the area of feedback directly over NYC associated with the passage of the best positive vorticity advection. The base of the upper level shortwave is already poised to pass the area in the next 6 hours after the last frame of the NAM. Although the H85 low is closed off, it's literally a little too late and a hair too far north. By the time the cold conveyor belt develops (if it can) the mid levels would support it's development over Southern New England at 90-96 hours...with the possibility of the feature extending south-westward towards Northern NJ and NYC.

There's two sides to each argument, though, and to your defense the NAM VV's and RH maps are impressive at the 84 hour mark--which would suggest the south-west extension option that I mentioned above could have a possibility of coming to fruition should this upper air setup verify as modeled.

post-6-0-10260200-1319470012.png

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To an extent, but the window for getting frozen precipitation to the immediate suburbs is quickly passing by 84 hours on the 12z run. Notice the area of feedback directly over NYC associated with the passage of the best positive vorticity advection. The base of the upper level shortwave is already poised to pass the area in the next 6 hours after the last frame of the NAM. Although the H85 low is closed off, it's literally a little too late and a hair too far north. By the time the cold conveyor belt develops (if it can) the mid levels would support it's development over Southern New England at 90-96 hours...with the possibility of the feature extending south-westward towards Northern NJ and NYC.

There's two sides to each argument, though, and to your defense the NAM VV's and RH maps are impressive at the 84 hour mark--which would suggest the south-west extension option that I mentioned above could have a possibility of coming to fruition should this upper air setup verify as modeled.

post-6-0-10260200-1319470012.png

the surface reflection is still developing and tightening, check out the 925 low and how its beginning to contract quickly, and while the window is VERY short, it won't take much to see some flakes at the coast and a slushy accumulation north and west.

Now what happens later in the period is up in the air.

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Agreed..especially over Central New York with the 20's. I think 30's are definitely possible throughout the Northeast...but the moderately large spread of 20's F temps is a little ridiculous.

Well I think it may be picking up the 2500'+ spots which might be ok. My thing was that it has 100-850mb critical thickness line over BOS until 00z Friday when it collapses se. That seemed a little too cold for me, but maybe it's right.

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