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Widespread Snow Potential January 16th to January 18th


sferic
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Looking at the 6z Euro, the 2 pieces (blue circles) that dive in and phase in the southern plains to form the storm are on or near the coastline today and fully onshore by 0z tonight. The northern stream (blue x) that comes into the Great Lakes near game time is still well out into the Pacific and does not come onshore until about 21z Saturday.

Screenshot_20220113-083618_Gallery.thumb.jpg.5f46f6f7534ae66fb9560eaff4c5b8dd.jpg

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17 minutes ago, tim123 said:

Today I believe all the players will be sampled fully

From BUF:

The upper level system that will force this system was still over
the Pacific Ocean for the 00Z guidance suite, but will move onshore
today in the Pacific Northwest and will be better sampled by the
radiosonde network and aircraft soundings from this point forward,
which should continue to promote converging model solutions and
increasing forecast confidence over the next day or two.
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Here is the full disco

WIDESPREAD Heavy Snowfall Possible Sunday Night and Monday...

High pressure will move off the New England coast Sunday, with a
ridge extending back into the eastern Great Lakes. This will bring a
dry day, with temperatures trending milder after a cold start.

Our attention then turns to a potential significant synoptic system.
The 00Z GFS/GEM/ECMWF are in very good agreement overall with the
longwave pattern evolution and synoptic scale details. Despite the
agreement in deterministic models, ensembles still show some typical
spread. The 00Z GEM ensemble mean is much closer to the
deterministic runs, while the 00Z GEFS is still farther east and
weaker.

The deterministic runs continue to show a low track that is farther
west than climatology. East coast systems typically track along the
coast and close to the coastal front, but in THIS case the strong
synoptic scale dynamics may overcome that trend and force the low
track farther west and well inland across the Mid Atlantic and PA.
One big reason for this can be blamed on a large sfc high that will
precede the storm...with the high moving off the New England coast
and blocking a more typical storm track up the coast. Nor`easters
usually run up the coast ahead of the Canadian high...but the timing
is such that the sfc high will force the storm system inland and up
the coastal plain. Storms of this nature have a history of
generating widespread snow throughout all of western and north
central New York. Similar sfc patterns occurred with the following
storms: 2/13/93, 12/29/97, 1/12/96, 2/23/98, 12/11/92 and 2/12/85.

The upper level system that will force this system was still over
the Pacific Ocean for the 00Z guidance suite, but will move onshore
today in the Pacific Northwest and will be better sampled by the
radiosonde network and aircraft soundings from this point forward,
which should continue to promote converging model solutions and
increasing forecast confidence over the next day or two.

Increased the POPS to likely for later Sunday night through Monday
given the agreement in deterministic runs. If the deterministic and
ensemble models continue to support this solution, there may be a
widespread, impactful snow event late Sunday night through Monday.

Following this system, expect some wrap around snow showers and at
least some limited lake effect east/southeast of the lakes Monday
night into Tuesday. A clipper system will then cross the Great Lakes
Tuesday night and Wednesday with a chance of more snow.
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8 hours ago, DeltaT13 said:

What does this mean? 

Ok, I was a bit heavy there on the hyperbole.  Should have said I'm skeptical of models showing WNY in the bullseye.  BUF has a great write-up this morning.  Have to check those dates to see how the snow was distributed across upstate.  

The deterministic runs continue to show a low track that is farther
west than climatology. East coast systems typically track along the
coast and close to the coastal front, but in THIS case the strong
synoptic scale dynamics may overcome that trend and force the low
track farther west and well inland across the Mid Atlantic and PA.
One big reason for this can be blamed on a large sfc high that will
precede the storm...with the high moving off the New England coast
and blocking a more typical storm track up the coast. Nor`easters
usually run up the coast ahead of the Canadian high...but the timing
is such that the sfc high will force the storm system inland and up
the coastal plain. Storms of this nature have a history of
generating widespread snow throughout all of western and north
central New York. Similar sfc patterns occurred with the following
storms: 2/13/93, 12/29/97, 1/12/96, 2/23/98, 12/11/92 and 2/12/85.
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1 hour ago, Buffalo Bumble said:

From BUF:

The upper level system that will force this system was still over
the Pacific Ocean for the 00Z guidance suite, but will move onshore
today in the Pacific Northwest and will be better sampled by the
radiosonde network and aircraft soundings from this point forward,
which should continue to promote converging model solutions and
increasing forecast confidence over the next day or two.

If we are going to get significant op model shifts as systems over the PAC move onshore and become better sampled, I look for that to occur in the next 2/3 major model cycles (0/12z).  So by Sat 0Z we should have good confidence in solution. 

06Z GEFS still looks bizarre with about 1/3rd of its members out near Bermuda. It's mean may end up being correct but perhaps for the wrong reasons. Or those outlier ens members end up being savants...

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Another thing while we wait for 12Z...regarding Miller A vs B.  March 1993 is regarded as a classic Miller A but even it had "center jumps" in the SE US (at least on modeling) as I recall. That doesn't make it a Miller B or even much of a hybrid. Some NWP runs with this system seem to be hinting at same occurring but I suspect it's more an artifact of the model trying to locate the slp over time.  It wouldn't be unreasonable to see that happen though IRL as the system makes the turn in the SE US.

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6 minutes ago, Syrmax said:

Another thing while we wait for 12Z...regarding Miller A vs B.  March 1993 is regarded as a classic Miller A but even it had "center jumps" in the SE US (at least on modeling) as I recall. That doesn't make it a Miller B or even much of a hybrid. Some NWP runs with this system seem to be hinting at same occurring but I suspect it's more an artifact of the model trying to locate the slp over time.  It wouldn't be unreasonable to see that happen though IRL as the system makes the turn in the SE US.

Yeah this is a classic Miller A in my book

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