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The Ledge Storm 19-20 Feb


Solution Man
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There is a good chance that it is a rug pull. However, how many times have we ignored it when it shows something unfair unfavorable because we said oh it’s the long range nam and it ends up being correct

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16 minutes ago, stormtracker said:

But also, and I'm being serious and also hopecasting:

Aren't the mesoscale models. better and picking up changes better in the short range?  Or is that just something we say to each to cope?

Absolutely.  The problem is that the mesoscale models really weren’t designed for beyond the day 2 period.  That doesn’t mean that they’re useless; you just have to use extreme caution. 

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Just now, Ji said:

There is a good chance that it is a rug pull. However, how many times have we ignored it when it shows something unfair unfavorable because we said oh it’s the long range nam and it ends up being correct

Honestly? Not that many noteworthy occasions lol. The storms it did are usually shit storms where we were expecting a middling level storm 

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NAM12km aside, NAM Nest was pretty solid by the end of its run. Keep an eye to the northeast over the North Atlantic. That right there is going to be a huge player in latitudinal push for moisture transport, and it may open the door for better synoptic scale dynamics along the east coast. Everything is about spacing and the flow becoming more meridional upstream and all the different features play a role in it. At hr 60, you can see the differences at 5H and the handling of the trailing jet energy off New England. Also, take a look at the 5H ULL over the Upper Midwest. There’s feedback from what is going on downstream to how that will evolve. I don’t think we are over with interesting runs yet. Someone is going to blink. The NAM is most likely to blink when assessing historical trends, but it has led the way on occasion, so don’t put it past it just yet, especially the Nest version. 
 

IMG_8740.gif.848af6b4fa7da13f32fc730e896abf65.gif

 

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If everyone recalls, the January 20 event that screwed the metros were originally showing the storm to form on the first front and not the trailing Arctic front. JB insisted it would form on the Arctic front and it did, which caused it to be warm in areas to the Metros and burbs south and east. If this follows suit, we could have a winner with the Nams. In that case it was only the Canadians that showed it on the Arctic front for days before. They then started to give in but not to the extent of other modeling.

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Nice disco here from LWX-

By the middle of the week, attention will turn to a potential winter storm approaching from the south and west. Recent trends have been for more separation between a southern stream disturbance (currently located off the Pacific Northwest Coast), and a northern stream disturbance (primarily composed of a shortwave currently moving from east to west along the northern periphery of an upper low currently centered over Manitoba and Saskatchewan). Greater spacing between these features would likely result in less interaction, and later phasing between these two disturbances, leading to a more southern storm track. This trend toward a more suppressed, southern track system started yesterday, continued with the 00z runs last night, and is even more prevalent within incoming 12z guidance. This trend toward a more southern track is leading to a trend down in snowfall totals across much of the area. While it still appears likely that most of the area will see at least some snowfall, a scenario where the northern half of the forecast area sees very little snowfall (nearly all in association with the northern stream system) is a distinct possibility now. That isn`t to say that the threat for a larger storm has gone away, it`s just that probabilities for that occurring have decreased greatly. At the moment, it appears as though southern Maryland currently stands the greatest chance for higher snowfall totals, as they`d be located closer to the southern storm track and eventual deepening coastal low. While the trend has been downward with snowfall totals, that doesn`t mean that there can`t be further shifts in either direction as we move closer to the event. The pattern across North America, as well as the North Pacific and North Atlantic is very complex at the moment, with numerous interactions between different disturbances yet to occur. This lends itself to some lingering uncertainty. Systems with lots of convection in the southern stream (as this one will) also commonly trend northward at short lead times. The upper level pattern to our northeast at the time of the system will likely be very blocked, so that potential for a northward shift back is somewhat limited, but still exists. So while the clear trend at the moment is very much toward a more southern track and lower snow totals, there is still time for things to change.

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