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December 2022 Medium-Long Range Disco


WxUSAF
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No way am I sweating details this far out, especially since both the Icon and Canadian showed an actual coastal, but I'm intrigued by what the GFS just did. It's pretty cool to see a flow of moisture coming at us from the NW, up and over CAD. Instead of a flood of warm air pushing from the SW that threatens to erode our CAD, we have the mechanisms in place to reinforce the cold air and because we get some redevelopment south of us and we have flow coming from the NW we're not threatened with the mids being overwhelmed with warm air.

Whether this happens or not, it's just kind of a cool thing to see play out on a model.

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1 minute ago, SnowenOutThere said:

Incoming on GFS? 

prateptype_cat.conus.png

looks like the jet stream is more favorable for the gom to get involved with that storm.  the first is a miller miss compared to 6z, but it's still not a bad spot to be in compared to the typical redevelopment further north.

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2 minutes ago, 87storms said:

looks like the jet stream is more favorable for the gom to get involved with that storm.  the first is a miller miss compared to 6z, but it's still not a bad spot to be in compared to the typical redevelopment further north.

Old forecasting rule was 3 to 4 isobars ahead of the storm it meant the Gulf was open for business. Looks like health blocking in Canada and the Atlantic at 500mb at HR240 ahead of the storm. That's nice.

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3 hours ago, nw baltimore wx said:

Did you just make a call for a Miller A???

 

 

I'm sure @WEATHER53 has some explanations.

Models frequently show a positive outcome from a Miller B for DC area.  They are almost always  wrong as it generally develops too far northeast and maybe Baltimore gets a little, northeast MD more, Philly to NYC a lot. 

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5 minutes ago, Always in Zugzwang said:

Well, if that occurs, we will have to refer to it as the @mappy storm (look at the valid time on that map)!

Now I'm torn...If we get it on Friday it'll be the Beethoven storm (his birthday for those who don't know :lol:). AND the Avatar storm. But at the same time...mappy storm, lol

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1 hour ago, CAPE said:

Not enough spacing/too much confluence kills the chance of a coastal this run. Wave just dampens. 

 

1 hour ago, Ji said:

there are so many ways to fail...even when things look good!

 

1 hour ago, WxUSAF said:

Blocking giveth and blocking taketh away

All this... There is a path here, but its narrow because the amount of confluence needed to force a system under us starting out that far north is so extreme its also likely to shred the system if thing's don't go exactly right.  We saw this a few times back in 2021 where a system originally supposed to cut way north ended up shredded to nothing by the time it got to us.  Does not mean it can't work out...but I still think our best bet would be for the system to kinda split and get a healthy front runner wave into the CAD rather then having the energy come out more consolidated and trying to slide under the block.  Yea that has bigger upside...but more often then not either the primary mucks up the mid levels OR if there is enough confluence the system gets shredded and washes out.  

 

But I am not pessimistic overall... this first wave COULD work...but I think there are likely to be better opportunities later.  If we do get any significant snow from this first threat I consider it a bonus.  

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39 minutes ago, CAPE said:

It's December. The favorable pattern is just getting established. You'll take 2-4 with sleet and rain and be happy.

The setup leading into it is nowhere near identical (in the sense that we're dealing with a major Midwest storm as depicted on the models) but the lack of major costal development and angle of precipitation as shown on the GFS heavily reminds me of 12/16/10, another event where an episode of blocking was becoming established. To my memory that was a clean 1-3" during the daytime, and a nice early sendoff into the winter break. I have yet to look at the h500 comparisons though, but the PNA was not all that favorable for that month either.

1396780294_ezgif.com-gif-maker(3).gif.6876e9349d8b67e33dd085284a8a1819.gif

 

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