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February 20 - 21 Winter Storm Threat


NEG NAO

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50 minutes ago, SnowGoose69 said:

This should trend further north as the SER gets resolved.  Question is does it go too far west and north of us?  Certainly possible but we have potential to thread this perfectly here because consensus at 72 hours is to our south which this year is what you’ve generally wanted 

Agree I'd much rather be rooting for a north trend than a south trend although unless im missing something isn't this storm already tracking NW it's just this would be the front end frozen part before flipping to rain

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7 minutes ago, SnowFreak2000 said:

12k looks even better and comes in around 1pm. Wall of heavy snow! Looking good but nam is not that good this far

A6D26671-A4A8-4BD0-A1A6-465020696F74.png

looks like this has real potential and is now within 3 days on modeling - thing I have been noticing is the frozen precip has been starting further south and it now starts as some form of frozen all the way to the VA/NC border....namconus_ref_frzn_us_43.png

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Just now, SnowGoose69 said:

The corridor that gets the WAA precip is gonna be narrow.  Maybe 100 miles.  North and south of that won’t see much of anything.  We won’t know for a good 48 hours where that sets up 

Yea and unfortunately that may be even narrower near the coast where the temps will rise the quickest. I could see PA/Western MD/Western Virginia doing really well with this setup, but for the coast it will either miss to the south or be too warm except for a very narrow region   

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10 minutes ago, SnowFreak2000 said:

Too much confluence leading to shredding of the precipitation 

Not gonna happen in this setup with that sort of SE ridge and where we are located.  If you’re up in New England maybe.  The best axis of heavy snow with this will be somewhere between 50 miles north of NYC and BWI.  It’s unlikely to end much outside of that area.   The shortwave will ride the ridge up from the TN valley and inevitably make a turn east at some point across WV or PA.  Where it meets resistance and makes the turn, areas that are dead center in that corridor will get hit hardest  

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AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ  
333 PM EST SUN FEB 17 2019  

   
SYNOPSIS
  

FOR WEDNESDAY

PTYPE ISSUES WILL BE ABUNDANT WITH THIS SYSTEM. PRECIP STARTS  
OUT AS ACCUMULATING SNOW LATE TUESDAY NIGHT THROUGH WEDNESDAY  
MORNING. AS THE AFTERNOON PROGRESSES, THE HIGH MOVES TOWARDS  
CAPE COD, ALLOWING WINDS TO SHIFT TO MORE OF AN EASTERLY FLOW,  
THEN MORE OF A SOUTHEAST FLOW. ALTHOUGH THERE SHOULD BE GOOD CAD  
INITIALLY, THE POSITION OF THIS HIGH ALLOWS FOR SOME WARMER AIR  
AT BOTH THE SURFACE AND IN THE MIDLEVELS TO LIFT IN FROM THE  
SOUTH. SNOW BECOMES A WINTRY MIX FOR SOUTHERN NEW JERSEY, THE  
DELAWARE VALLEY, INCLUDING PHILLY, AND DELMARVA EARLY WEDNESDAY  
AFTERNOON, BUT SNOW CONTINUES FOR NORTHERN NJ, THE LEHIGH  
VALLEY, AND THE SOUTHERN POCONOS THROUGH AT LEAST THE DAYTIME  
HOURS WEDNESDAY. GOING THROUGH WEDNESDAY EVENING, PRECIP CHANGES  
TO PLAIN RAIN FOR DELMARVA, WHILE PRECIP BECOMES RAIN AND SLEET  
FOR MUCH OF SOUTHERN NJ AND SOUTHEAST PA, EVENTUALLY BECOMING  
PLAIN RAIN. FOR THE NORTHERN HALF OF THE FORECAST AREA, AS WELL  
AS FAR WESTERN ZONES, EXPECTING A PROLONGED PERIOD OF SLEET AND  
FREEZING RAIN THAT WILL RESULT IN ACCUMULATING ICE WEDNESDAY  
NIGHT. WILL CONTINUE TO MONITOR POTENTIAL FOR AT LEAST WINTER  
WEATHER ADVISORIES WITH THIS SYSTEM.  
 
BY THURSDAY MORNING, PRECIP EVENTUALLY BECOMES ALL RAIN BEFORE  
TAPERING OFF BEHIND THE DEPARTING LOW.   
  

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49 minutes ago, NEG NAO said:

Hopefully we will have cold enough air at all levels for this event at the beginning to prevent what is happening like tonight' where many are reporting just rain and even further north sleet ……….

You would think we are in business with this but by the time it gets up here it’s too late.  We need the ridge to pump more and push the wave of WAA snow further north

 

 

C08FEBDC-07E0-466B-B768-0584E60A969B.png

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1 hour ago, NEG NAO said:

Hopefully we will have cold enough air at all levels for this event at the beginning to prevent what is happening like tonight' where many are reporting just rain and even further north sleet ……….

Its definitely plenty cold for snow at the start with this unfortunately the models halt any real precip until it warms up, hope that changes but given this winter.....

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26 minutes ago, HVSnowLover said:

Its definitely plenty cold for snow at the start with this unfortunately the models halt any real precip until it warms up, hope that changes but given this winter.....

0Z GFS does not  look good for much if any advisory level snow with this event for the immediate NYC metro at least...…HP is in the wrong spot too

gfs_mslp_pcpn_frzn_us_11.png

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3 minutes ago, NEG NAO said:

0Z GFS does not  look good for much if any advisory level snow with this event for the immediate NYC metro at least...…HP is in the wrong spot too

gfs_mslp_pcpn_frzn_us_11.png

We want the precip to come up faster before the cold air goes away.

The high is in the wrong spot on every model. Thats not the issue. This is a snow to rain event.

 

Cmc looks good for CNJ

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3 minutes ago, Snow88 said:

We want the precip to come up faster before the cold air goes away.

The high is in the wrong spot on every model. Thats not the issue. This is a snow to rain event.

 

Cmc looks good for CNJ

When thicknesses are colder in Phoenix than NYC, there's your issue. 

A low over northern Missouri isn't usually favorable here. We've seen so many of these tracks west of us this season.

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6 minutes ago, Snow88 said:

We want the precip to come up faster before the cold air goes away.

The high is in the wrong spot on every model. Thats not the issue. This is a snow to rain event.

 

Cmc looks good for CNJ

The high position isn’t really the issue at all.  It’s that the models wash out the disturbance that triggers the overrunning. I fully believe they are doing that too fast.  In addition going with the seasonal trend this will prbosbly bump north in the final 48 hours due to the SER.  I would want to be in CNJ or E-C PA right now 

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8 minutes ago, SnowGoose69 said:

The high position isn’t really the issue at all.  It’s that the models wash out the disturbance that triggers the overrunning. I fully believe they are doing that too fast.  In addition going with the seasonal trend this will prbosbly bump north in the final 48 hours due to the SER.  I would want to be in CNJ or E-C PA right now 

Cmc is nice with the onset precip for CNJ.

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