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Snowathon Obs/ Nowcast 02/07-02/09


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The title of this thread should contain "Now cast," as well ... 

 

Currently, although HPC's most recent surface analysis (about an hour and a half ago...) depicts the arctic boundary as having become stationary east-west through eastern PA/NJ out some 60 or so miles S of LI, there seems to be a secondary push of colder air currently aligning from west of ALB to between the Rt 2 corridor and the Mass Pike.  

 

Above this secondary virtual boundary ... temperature have plummeted into the mid teens.  Meanwhile, along the South Coast of SNE, temperatures are in the low to mid 30s.  Also, radar shows a narrow band of precipiation intensifying along/N of this same llv gradient, west of ALB into southern VT.  

 

Mentioned this yesterday and the day before on a couple of different posts that one way this event could over-perform, relative to the weak looking jet mechanics through the deeper layers, is by having low-mlv anomalously tilted frontal sloping to direct any UVM less slantwise and more upright. That would make snow growth from condensates more efficient relative to what's available.  I would hunch this east-west extending band is perhaps systemic from that being the case... 

 

We'll see how it evolves...

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N shore CF is now pinned up near shoreline. Only Marblehead, Nahant and Winthrop Are east of it. Thompson Island SE of bos just went to 24. Mentioning it with the idea that HI RES models had this area tick upward around 5-6pm after S shore moderate next 2 hours.

 

Meanwhile From Taunton on Southward mid 30's. So there seems to be a more subtle  W-E boundary of sorts and we will have the CF taking shape this eve.  

 

Weenie OES should move over Boston next hour.

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