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Upstate/Eastern New York


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Kbuf

 

 
A very untrustworthy weather system is then set to impact the region
Thursday into Friday. Why untrustworthy? It has nothing to do with
the chance of precipitation, which is near 100%, nor the QPF amounts
which are generally around inch centered over the western Southern
Tier, tapering off to around a quarter inch in the North Country. It
all comes down to thermodynamic profiles and how much cold air is
available to cause a transition to snow on Friday. This event has
been mainly billed as a rain event that is expected to change over
to and end with some minor or nuisance snow on Friday. But not so
fast...

Let`s have a closer look at the details. This low pressure system is
forecast to develop as a northern stream wave tracks from Montana to
the Great Lakes, while a southern stream wave ejects from the Four
Corners region and phases with the northern stream wave near the Ohio
Valley. The result will be a strengthening surface low tracking
either just over the Southern Tier or just south of the forecast
area over northern PA. Dynamics with this deepening low and phasing
upper level wave look fairly impressive, all while interacting with
a deep easterly flow of Atlantic moisture back across western NY.
This will undoubtably result in widespread rain overspreading the
region from SW to NE Thursday afternoon and evening.

Here`s where the forecast gets interesting and the uncertainty
grows. Synoptic dynamics Thursday night into Friday morning look
outstanding as upper level diffluence maximizes over the forecast as
the mid-level wave strengthens and becomes a closed low. Moderate to
heavy precipitation will likely fill in north of the surface low
along a deformation zone and possible TROWAL with a fetch of rich
Atlantic moisture. Where exactly this heavier precipitation sets up
will depend on the exact track of the surface low. The 00Z GFS
remains the farthest north with the low, taking over the western
Southern Tier, while the 00Z EC and its ensembles track the low the
northern tier of PA. Perhaps even more importantly, this track will
determine the thermodynamic profile over the forecast area, with a
slightly farther south track more favorable for pulling in colder
air across the region sooner. The 00Z ECMWF suite seems to favor
this overall cooler solution, which would favor much quicker
transition to snow Thursday night and possibly significant snow
totals. However, even with a colder solution like the EC, have to be
dubious of the possibility of an above freezing TROWAL wrapping in
off the Atlantic that could force precipitation to linger longer
than expected as rain or a wintry mix. Also, now that we are getting
into March, the sun angle is getting higher and daytime snow
accumulations are getting more difficult, especially on paved
surfaces. However, if this storm system maximizes in the early
morning hours Friday as currently advertised, this effect may be
mitigated.

So where does this leave us? Have adjusted the forecast to
incorporate more of the colder air solutions favored by several
global models including the EC and its ensembles. This adjustment is
also out of respect to the climatologically favorable setup for snow
as a low tracks south of the forecast area, which is also reflected
in decent snow totals still reflected in the CIPS analogs based off
the warmer GFS. Will also add note of the possible snowfall in the
HWO, although the range of possible outcomes remains quite large at
this point with respect to snow amounts.
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Tim! Welcome back. I need backup in here. Been fighting off these negative Nancy’s all week. 

Euro does have some enhancement. I’m not gonna jump on those totals (my god!) but it’ll be thrown into the mix. 

Same idea as before, NAO crashes, phased event, climatologically we get nailed in early March, tons of energy, it’s South of us, energy hangs back as a HUGE storm develops over the shipping zones= somebody here gets shellacked. Still thinking elevation helps but it’s not necessary. NWS mentions diurnal effects which don’t concern me, it’s early March NOT mid April. 

Love to see a euro snowfall totals map. I wanna visit Clown Town before it gets closed down. 

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13 minutes ago, rochesterdave said:

Ripped from the other forum.

DBF6AE76-AA67-4CCF-9AF1-C6386BF216D4.jpeg

Don't let Freak see this.  ;)

But not to worry, behind curtain #2 we have the GFS...and even on the further north GFS, the 12z sounding is brutal for KSYR in the boundary layer for virtually the whole duration.  

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