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Mid to Long Term Discussion 2017


buckeyefan1

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45 minutes ago, FallsLake said:

Lol. Yep, need the NAM on board. I think it was the best model for the last event (within two days).

That's right. Folks can make jokes about the NAM all they want to but it can sniff out a warm nose a mile away. That and the RGEM are usually very good at close range.

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So a fairly encouraging run of the GEFS out in la la land, compared to the 6z that I posted earlier.  The 12z run features some nice improvements.  What we have here is the Cockeyed Grumpy Cat pattern.  A typical Grumpy Cat pattern features a strong GOA low, lower heights throughout the NAO region, and broad ridging across the central US, giving rise to its onomatopoeic name.  HOWEVER, the cockeyed variant clearly shows a few favorably located features, outlined in red:

First, we have a strong signal for an Aleutian low.  This feature is good for pumping up heights in the PNA and potentially NAO spaces.  The resulting downstream reflection is a trough in the east and an environment favorable for PV construction in eastern/SE Canada.  You also will notice some ridging working into Greenland.

The typical evolution of such a pattern is either:  A) The eventual decay of the western ridge, compliments of a strong and progressive Pacific jet, or B ):  A stationary element to the Aleutian low, allowing continued PV development in Eastern Canada with a potential ridge-bridge over the Pole, initiating a -AO/-NAO regime.  Given the SSTs in the Northern Pacific, the strong Pac jet to date, and the general inability of the Aleutian low to persist so far this winter, I'd favor scenario A.  But we certainly can't rule out scenario B.  Even if we get scenario A, we still may have an opportunity or two for a winter storm, if this pattern comes to fruition.

 

gfs-ens_z500_mslp_nhem_65.png

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2 minutes ago, mackerel_sky said:

JB said today the NE will be cold later, as opposed to the whole east last week! What a hack! Final grasp for last minute subscriptions! 

 

Just now, BIG FROSTY said:


I hope you get them! If he depends on me he'll go broke. emoji4.png


Sent from my iPhone using Tapatalk

Wait....so he hasn't thrown in the towel but he is backing off the "cold east" to cold in the NE?

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8 minutes ago, BIG FROSTY said:

Big dog incoming this month!!!


Sent from my iPhone using Tapatalk

JB said today the NE will be cold later, as opposed to the whole east last week! What a hack! Final grasp for last minute subscriptions! 

Yeah, it's on his Facebook today! Delayed but not denied, in the moneymaker!

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Our Friday (non)event:

With respect to precip type: With the parent surface high still over
the North Plains, far removed from the area, low-level thermal
profile is only marginally cold enough to support any freezing rain
across the northern piedmont/coastal plain with lows Thursday
night/Friday morning expected to fall into the lower/mid 30s north.
And without more than a few hundredths of liquid precip across the
far north, there is not enough evap cooling potential to keep
temperatures at or below freezing. Additionally with
moisture/saturation only extending -6C, the chance of any ice nuclei
in the clouds to support snow is almost non-existent as well.
Thus, will continue to keep the forecast in the form of plain rain,
albeit a cold rain with temperatures remaining in the upper 30s to
lower 40s throughout the day on Friday.

 

Our Sunday (probably non)event:

Modified Canadian/Arctic air mass will initially reside over central
NC Saturday. This cool dry air mass will result in sunny skies and
afternoon temperatures a bout a category below normal. A fast moving
upper disturbance will follow quickly on the heels of this rapidly
modifying air mass on Sunday. Current model guidance depicts modest
saturation in the lower half of the atmosphere by 12Z Sunday, but
little moisture present in the favored dendrite formation region
(colder than minus 10 deg C). Also, model soundings depict a fairly
dry sub cloud layer, leading to evaporative cooling. If (and this is
a big if) light precipitation starts early enough early Sunday,
precip would initially begin as light freezing rain, then transition
to rain. Due to isolated nature of the spotty light freezing rain,
this has a high probability of being a non-event, if it occurs at
all. Overcast skies and spotty light precip Sunday morning-early
afternoon may initiate a brief in-situ damming event, primarily
focused across the northern Piedmont. Model temperature guidance
still looks too warm, so will continue the trend of advertising high
temps cooler than statistical guidance.
 

 

What's next.....

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