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December Medium/Long Range Discussion


yoda
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8 minutes ago, PhineasC said:

Getting near the time where we drop the charade and have to acknowledge the hard reality that this will not be a region-wide crowd pleaser and there will be a screwzone. Snow is a brutal sport. If you live on a barge in the Potomac in SE DC, you are getting a lot of rain. 

That’s the perfect way to put it. Charade is the right word. Some keeping acting like they don’t know how this plays out 15 out of 16 times. 
 

95 crew and even a bit west with this one are probably capped at 6”. Thinking more like 2-4 zone but maybe it pops. 
 

Everyone should just head to Leesburg that day. Get some food. Relax. If you’re able

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21 minutes ago, Buddy1987 said:

Anyone willing to answer. Does a stronger low mean more flooding of the mid levels with warmer air above the surface or will this storm just be strictly dependent on the placement of the low and its eventual track?

It depends on low placement / track. Typically speaking... a strong SLP doesn’t bode as well for the coast as it does for the interior. Warm air intrusion can be a big concern. As is my concern with this storm along and east of 95. Stronger typically means a closer track to the coast. 
 

There’s likely going to be a pretty big snow gradient unless this thing begins trending SE a bit. Snow to Rain E of BAL / DC... a few sloppy inches downtown...3-6” just outside the beltway, and 6-12+“ north of 70 and west of 270. Classic December setup. We get that 1040 HP to anchor in the right location however, and coasties get their boom.
 

Currently, the QPF jackpot is in northern MD / southern PA (1.5 - 2” of qpf looking at deterministic models) - along with the best lift. Need a decent jog SE for I-95 to get in on warning level snowfall unless you live in NJ and points N. 

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1 hour ago, Eskimo Joe said:

:o

 

 

If Ellinwood is bullish out here it is on. I am even expecting some mixing out here at this point. The problem is the HP location. The models are wanting to take it a little too far east. Either way I am not gonna complain. Those of us out west look to be in the perfect spot for this one. 

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1 hour ago, 40westwx said:

you see that coma shaped area of below 0 to the south and west of DC.. I think the model picking up on the dynamics of the system.. it looks like thats where wind shifts around to the north and banding sets up.. 

I was thinking the same thing. I'm in FFX county just west of FFX City inside that comma zone.  We almost always do very well in these kinds of coastals.  The maps usually underestimate the frontogenesis dynamics.  

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4 hours ago, CAPE said:

Those surface maps are not accurate, for the umteenth time.

The 6z GFS is a classic NW of fall line snowstorm, with some mixing on the SE edge. For DC to BWI points east, the surface gets toasty for a good part of Wed, and 925 mb temps are also problematic. 850s actually look ok this run. I-95 and east will need some serious dynamical cooling during the day Wed to overcome the warming lower levels, and then hope the backside delivers at night as the low pulls away from the coast.

And as for the CAD? Will that help any?

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37 minutes ago, Maestrobjwa said:

And as for the CAD? Will that help any?

It will, but for the lowlands it will get scoured out if that low track is tucked in for a time as advertised. At that point its a matter of how much time elapses before the colder air gets back in. A lot of elements in play there depending on one's exact location and developing dynamics. Baltimore will probably warm above freezing but it may be fairly brief compared to areas further SE. Are you in the northern part of the city?

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2 minutes ago, CAPE said:

It will, but for the lowlands it will get scoured out if that low track is tucked in for a time as advertised. At that point its a matter of how much time elapses before the colder air gets back in. A lot of elements in play there depending on one's exact location and developing dynamics. Baltimore will probably warm above freezing but it may be fairly brief compared to areas further SE. Are you in the northern part of the city?

Yeah, the northeast Baltimore part

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8 hours ago, poolz1 said:

Cherrypicked....

This pattern doesnt look to go anywhere soon...and maybe improve to include some real cold to work with. -EPO joins the party.

Stable looking pattern.

 Al91SxE.png

 

Great trends on keeping the AO negative during December.

Love having that indice in our favor moving forward. 

 

1634915175_ao.sprd2(10).thumb.gif.97760eb2b990054a16ac136ebf31dc35.gif

 

 

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