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Potential Clipper System 1/21


TauntonBlizzard2013

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Norlun troughs are notoriously difficult to pin down.  One thing I have noticed is that they tend to rotate south, cyclonically, across successive runs.  Ex: if at 84 hours there is a precipitating column amid inverted troughing up in Maine, the 72 hour run slips it south, 60 to Cape Ann...48 along LI, then a no show.  

 

Yet they do happen from time to time.  What that means really is that whatever physical properties cause them to happen they are less discretely understood -- otherwise the models would process them with more accuracy.  

 

One of the best Norlun stories I ever heard was a virtual blind result of nearly 20" in Portland Maine.  Imagine going to bed and waking up with your car tented, with no idea it was coming ?

 

There are some classics buried in our archives up here.

 

"Slow clearing Down East" > "A dusting of snow possible" > "1 to 3 inches" > "2 to 4 inches" and so on until the forecasts settle around 15".

 

But the old rule of thumb is you don't pull the trigger on an inverted trough until you see the whites of its eyes. Trying to nail down an accurate snowfall forecast well in advance of one is virtually impossible. It could just as easily drop a foot at PSM as it could be all out to sea and bury the Isle of Shoals instead.

 

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