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On Thursday a trough will dig across the eastern Great Lakes
which will encourage a cold front to drop across the region.
Latest model guidance is in better agreement, with the GFS
trending toward GGEM/ECMWF guidance which have consistently
tracked a wave of low pressure from the lower Mississippi Valley
to southern New England. The surface low will remain well to our
south, but it will provide some synoptic moisture which will
enhance the frontal passage, and then lake effect snow showers
behind the front. There are minor timing differences with the
front, but consensus suggests 850 mb temperatures will drop to
around -10C behind the front Thursday evening, and down to -13C
by Friday morning. This is plenty cold enough to support snow at
all areas, and will bring the first real taste of winter to many
locations.

As is usually the case for our region, the bulk of the snow will
be lake effect (or enhanced). A northerly component post-
frontal flow will not support banding but will provide a general
snow shower regime which will develop Thursday and last
Thursday night and Friday. It`s difficult to pin down amounts in
this flow but advisory amounts of 4+ inches in 12 hours are
definitely in play. The greatest risk for these is across the
western Southern Tier where upsloping and upstream lake
connections will provide enhancement. Regardless of snow
amounts, there is high confidence in much below normal
temperatures with the forecast generally a few degrees cooler
than model consensus blends
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Another even colder air mass will approach Saturday night, with
an almost arctic frontal boundary likely to drop southward
across the region in the Sunday timeframe. 850mb temperatures
will drop to around -15C by Monday with excellent model
agreement for this timeframe providing good forecast confidence.
Temperatures will be well below normal by Sunday night with
highs on Monday struggling to reach freezing. This also will
support another round of lake effect snow. Much of this will
again be behind the front in a northerly component flow which
would provide a general snow shower regime rather than localized
banding. However with temperatures aloft this cold and initial
moisture from the trough there could be a good fluff factor and
cold enough surface temperatures to support some significant
accumulations.
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5 minutes ago, Syrmax said:

But but but the NWS month ahead forecast promised us a balmy November. How can this be?  Their CO2 algorithms must have blown a fuse.

Damn it they have as much of a clue as we do!!! They no longer perform true forecasting...thesw models are incredibly fickle and change at any little change...that said im truly starting to get excited as its possible by next Tuesday it will look an awful lot like winter around mist of upstate NY

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1 hour ago, Buffalo Bumble said:

Most wintry early November period incoming since the Little Ice Age...:huh:

Actually just last year we had an abnormally wintry November too!  It snowed 20 out of 30 days which is really quite a startling statistic.  Rochester had 17 inches for the Month.  December then went on to have above average temps and minimal snow, so these fast starts appear to come with risks.  

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1 hour ago, DeltaT13 said:

Actually just last year we had an abnormally wintry November too!  It snowed 20 out of 30 days which is really quite a startling statistic.  Rochester had 17 inches for the Month.  December then went on to have above average temps and minimal snow, so these fast starts appear to come with risks.  

It's an interesting pattern we've had over a few years.

When I think of deer hunting season I think of being out in winter conditions.....we always seem to have some snow and at least a period of bitter cold where we struggle to get up to freezing for a high.

Then I think of Christmas week, a month later.....and it tends toward the balmy side, often with no snow around.

 

 

 

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26 minutes ago, cny rider said:

It's an interesting pattern we've had over a few years.

When I think of deer hunting season I think of being out in winter conditions.....we always seem to have some snow and at least a period of bitter cold where we struggle to get up to freezing for a high.

Then I think of Christmas week, a month later.....and it tends toward the balmy side, often with no snow around.

 

 

 

I checked my records the other day...in 2016 and 2018 we had 20" mixed synoptic and lake enhanced/effect events around Syracuse prior to Thanksgiving (around 15th-20th each time).  And I agree, the Christmas week to New Years period has been mild more often than not over the past several years.  For the record KSYR averages about 9" snow for November. For many years we were below normal but 2016&2018 made up for some of that.

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5 hours ago, Buffalo Bumble said:

Most wintry early November period incoming since the Little Ice Age...:huh:

November 9,1995 I closed on my house. I drove up the thruway in a snowstorm from Canastota west. KSYR got 7.9 inches that day. November 1995 is the snowiest November at Syracuse with 34.2 inches. 

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