The Winter Buzz ! (Factors, Winter 101)
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18z NAM Continues Trend

For starters the model is now seeing the signs in the E PAC with pumping up the northern stream ridge. This allows more amplification and a stronger deeper trough that forces a low to develop closer to the coast.  Still not where we want it but it is the trends...

 

Screen shot 2013-01-23 at 3.39.53 PM

 

The ridge is weaker in northern stream and does not show much precip make it north of NC/S VA. This was the 12z run today of the NAM.

 

Screen shot 2013-01-23 at 3.41.58 PM

 

NEW NAM does something we have been waiting to see from this model and that is a stronger ridge.  This leads to a stronger and deeper trough with significant precip making its way northward.

 

Screen shot 2013-01-23 at 3.44.03 PM

 

The coastal develops much sooner and throws back some nice qpf for DE into VA but still too late for others to benefit.  The key here is the west shift compared to the 12z run that is below for the same time frame:

Screen shot 2013-01-23 at 3.44.16 PM

 

In the frame above the Jersey shore went from nothing to a trace to 2" in a model that changed that much in 6hrs.  With data still coming in from the PAC for tonight's runs it seems reasonable to expect this trend to continue.

 

GFS

 

The 18z GFS ends the trend by missing the northern stream apmlification, other than that it still hits the area with a light snow event.  But if it amps up in tonights runs we will see a better result.  

 

Blog started by Mike DeFino , on 119 days ago
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Charles
Can we please start talking about the next significant snow storm chance???
119 days ago
 
Jaryd More
I wouldnt give up entirely on this system. Let's see what 00z Nam says first tonight. I know the frustration though considering this was being modeled as a significant snowstorm a couple days ago
119 days ago
 
John Manetta
By the way, calling people dumb or other name's is very immature.
119 days ago
 
Jaryd More
Right now it seems like a 1-2'' event for Philly Metro. But another shift north with precip and were talking 2-4". Which by the way would be many people's biggest snow of the year
119 days ago
 
Jaryd More
GFS ensemble looks good for about .25 qpf
119 days ago
 
John Manetta
Reggie, you mentioned that the low is forecast to be very close but just out of reach for the Delaware Valley to see significant snow; bear in mind that this low was forecast to be far, far away not too long ago. Keep the faith, the 00Z will be important.
119 days ago
 
John Manetta
As most of us know, the 18Z is an off run. It is likely that the current forecast for southeast PA is lower then what we'll see. Looking at the northern system, the water vapor and the southern stream, along with the trend continuing for higher qpf with ratios of 20 to 30 to 1should make snow lovers happy.
119 days ago
 
Rudy R.
The 6Z/18Z is notorious for showing solutions that are biased to the SE. I expect the 00Z suite to shift about 75-100 miles to the NW with potentially significant snows along and east of 295 and the NJ turnpike. Philly will probably be in the 2- 3" range while people along and east of the demarcation boundary mentioned should see 3-4" with some shore folks picking up 5".
119 days ago
 
Joe
From Tri-State Weather

‎18z GFS is in and it continues the trend of the 12z run and pushes the storm further North. That is one part of the equation. Now all we need is for it to develop faster, and we will be in a moderate snowstorm. ! Can we make it happen? Tonight's full 0z model guidance will be interesting
119 days ago
 
Reggie Smith
the way I look at it is yes the trends are slowly coming back in our favor but BIG DEAL, the trends are not significant enough to give us a major winter storm. So now it looks like we will get an inch of snow instead of flurries. -__- Who the heck cares. The low will develop tantelizingly close to the coast but not ENOUGH to give us snow. The clipper tonight, ruins the friday storm. Sry folks, but enjoy your inch.
119 days ago
 
Heat Island 718
That clipper ruins everything in regards to friday . Daaaaam
119 days ago
 
nkay
will boston be seeing any major noreaster this winter?
119 days ago
 
nkay
wat happened to the major friday snowstorm?
119 days ago
 
Snowfall100
18z is just recycled data if u guys were smart you would know they are ****
119 days ago
 
Heat Island 718
Ahhh this means 3 inches max for me in nyc
119 days ago
 
Heat Island 718
Ha was looking at the clipper duiuuuugh. Feeling like an idiot right now. Thanks timmy for pointing that out. Exept for the extra stuff
119 days ago
 
snowlover30
I hope Winter forecasts are for warm and dry next year so we have a chance for snow.
119 days ago
 
tim riggins
That bomb that showed on the GFS for Jan 31st - Feb 2nd looks like its non existent. This is not our year for snow people. Stock up next year I guess.
119 days ago
 
tim riggins
BTW Bobby, even Mike just said the 18z gfs just ended the trends. How do you feel :}
119 days ago
 
snowlover30
This will all be a distant memory by Wednesday next week when temps. will be near 50. All this cold air is just going to waste.
119 days ago
 


weatherrush


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