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January Medium/Long Range Discussion


WinterWxLuvr
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2 minutes ago, Heisy said:

Even though there was no event this run it was closer than people realize. It didn't dig the shortwave as far into the southwest this run so the spacing was off.  Looooooooong way to go

Yeah it was...I mean you can even see it phase and turn north off shore. Same kind of direction --could that indicate some kind of a trough in the east?

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11 minutes ago, psuhoffman said:

It handles the NS remarkably similar just has no stj wave there to phase with this run. 

Yeah the 12z run had that stj energy farther southwest initially which allowed the northern stream to phase. Wouldn't have taken much change this run, still like the time period for potential.

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28 minutes ago, Jersey Andrew said:

It’s supposedly the largest documented storm to hit DC and Virginia. George Washington and Thomas Jefferson claimed in their diaries that snow reached a depth of 3 feet region wide. Hard to verify this though.

I read about that somewhere and remember a quote like "...36 inches deep on a level."  To have a snow depth of 36" the snowfall amounts by today's measuring must have been in the 45" range!

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17 minutes ago, BlizzardNole said:

I read about that somewhere and remember a quote like "...36 inches deep on a level."  To have a snow depth of 36" the snowfall amounts by today's measuring must have been in the 45" range!

Parts of the western suburbs got close to that total in both 2010 and 2016, so it's really not that far-fetched.  Maybe for the coastal plain, but west of the fall line that is not an outrageous total.

 

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2 minutes ago, mattskiva said:

Parts of the western suburbs got close to that total in both 2010 and 2016, so it's really not that far-fetched.  Maybe for the coastal plain, but west of the fall line that is not an outrageous total.

 

True - but keep in mind I believe these obs were taken pretty close-in - like at Mount Vernon perhaps. 

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1 minute ago, Kmlwx said:

True - but keep in mind I believe these obs were taken pretty close-in - like at Mount Vernon perhaps. 

Yeah, that's a little more surprising.

Dulles got 32" in 2010 and 29" in 2016, both of which are close to three feet.  But I think the numbers were quite a bit lower at National.

 

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30 minutes ago, Heisy said:

Yeah the 12z run had that stj energy farther southwest initially which allowed the northern stream to phase. Wouldn't have taken much change this run, still like the time period for potential.

Yeah, was seeing that as well just didn’t realize the difference it would make downstream. Now we see. Ha. Need more energy helD back there. Need to keep an eye on that feature as we move forward.

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1 hour ago, Jersey Andrew said:

It’s supposedly the largest documented storm to hit DC and Virginia. George Washington and Thomas Jefferson claimed in their diaries that snow reached a depth of 3 feet region wide. Hard to verify this though.

They measured snow in perches back then, not feet.  Must be a forgery.

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26 minutes ago, psuhoffman said:

This is 24 hr precip. This is as big a signal as you will ever see at that range due to timing differences and outlier members that far out. 
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So, something interesting of note on the 18z euro. Yea it only goes out to 90 hours and this probably means very little at this range,  but there's a significant change that could impact things down the line. If you follow the 12z gfs through its run the stj energy that ends up phasing with the northern stream enters the CONUS around 90 hours out. The 12z gfs dug this energy pretty far SW which then gave more room for the northern stream to catch up to it. 18z gfs didn't dig it as far and it sped up the wave, thus the missed phase etc etc...

Well, check out the differences on the 18z euro in Southwest Canada. The new 18z euro has a much better trajectory to send a wave into the southwest...im extremely bored and desperate, but here goes...

 

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26 minutes ago, WxUSAF said:

^precip pattern looks Miller B-ish?

Earlier panels have precip in the gulf coast. It’s a hybrid signal. There is a NS wave diving in and an STJ wave in the Gulf Coast. Members get to a big storm multiple ways. Some phase the two late off the mid Atlantic. Some of those still manage to get us with a 12z Gfs type solution. Some Miss though. Some get the NS out of the way first then bring the stj wave up. Some get the stj ahead and phase the NS in behind and some of those go nuts and cut like the storm last weekend. The non storm minority cluster have the NS dive in on top and crush everything. 

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19 minutes ago, losetoa6 said:

HH Eps with a positive shift for  the day 5/6 threat . NS further east out ahead and more emphasis on the stj sw energy in the gulf . Both the 18z Euro and control are stronger with the sw ejecting out of the sw at hour 90.

The trend so far this January has been for the NS to be modeled as faster when closing in range.. reel this one in!

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