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Models Have Us On Northern Edge Of Snow 3/4/16


bluewave

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SREFS , GFS and it's ensembles are .5 at KNYC.

Cold 850s and this system will deepen rapidly so if it gets close enough there should be good lift right through the slot so you could go 12 to 1 .

The question is , is it .2 or .5 , we will know at 12z

It's pretty much an I95 event. The EPS agrees.

It's 2 to 4 with the potential for more in CNJ and LI.

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They are run off the prior NAM

Actually you are correct and incorrect at the same time. After doing some research into this, the sref uses the next nam op run data so it can actually give a clue as to where the next nam run might head. However, the sref is also ingested with the prior wrf data which is another product ran off of the nam.
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Actually you are correct and incorrect at the same time. After doing some research into this, the sref uses the next nam op run data so it can actually give a clue as to where the next nam run might head. However, the sref is also ingested with the last wrf data which is another product ran off of the nam.

So 21z takes the 0z initialization data and goes backwards 3 hours and forecasts out 3 hours to 0z which may or may not match the actual initialization conditions? Yikes.

I do know the prior NAM is one of the members.

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Upton



 



 



00Z MODEL RUNS CONTINUE TO HAVE SOME DISCREPANCIES WITH TRACK AND INTENSITY OF THIS LOW PRESSURE SYSTEM. THE MODELS ARE IN AGREEMENT THAT THE LOW PASSES FAR ENOUGH SOUTH THAT THE CWA WILL BE ON THE NORTHERN FRINGE OF THIS STORM. THE GFS IS THE MOST AGGRESSIVE WITH A WIDESPREAD 2-4 INCH SNOWFALL. THE ECMWF AND NAM KEEP QPF AMOUNTS BELOW THAN 2 INCHES. FOR NOW...WITH STICK CLOSE TO CURRENT FORECAST. EXPECTING AROUND 1-2 INCHES ACROSS MUCH OF THE FORECAST AREA..EXCEPT ACROSS THE EASTERN HALF OF LONG ISLAND AND EASTERN CT...WHERE 2-3 INCHES WILL BE POSSIBLE. IF SUBSEQUENT MODEL RUNS BRING THE LOW CLOSER TO THE COAST...EXPECT SNOWFALL AMOUNTS TO INCREASE.


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Stronger system makes the over running weaker. Unless we see further NW trends, we may witness the ultimate shaft job.

 

 

Look how the coastal robs the overrunning dry.

 

NAM-HIRES_Radar_ne_f42.png?v=1456928999

 

NAM-HIRES_Radar_ne_f48.png?v=1456929266

this was my concern yesterday-as the old system dies in OH and jumps to the coastal, we end up in the screw zone...looks to be unfolding that way on modeling the last 12-24 hrs

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