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Major LES Events- Feb 5-?


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First watches posted

image.png.0a430ba42ed3f94f750117f4d017c6f2.png

...WINTER STORM WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH
LATE SATURDAY NIGHT...

* WHAT...Heavy lake effect snow possible. Total snow accumulations
  of 9 inches or more in the most persistent lake snows. Winds
  during the heaviest lake effect snow Friday night into Saturday
  could gust as high as 45 mph resulting in considerable blowing
  and drifting snow.

* WHEN...From Friday afternoon through late Saturday night.

* IMPACTS...Travel could be very difficult to impossible. Areas of
  blowing snow could significantly reduce visibility. The
  hazardous conditions could impact the evening commute on Friday.

image.png.33fb8888daf6ba73338b5897f6956e0a.png

 

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Heading into Friday night, 850mb temperatures will drop into the mid
negative teens which will fully support lake induced instability
with lake equilibrium levels over 7kft. Meanwhile, ample moisture
will be added to the area through the passage of a mid-level
shortwave trough. This combination and fact that all the lake
convective layer is in the DGZ, will support a period of heavy lake
effect snows northeast of both Lake Erie and Lake Ontario Friday
night through Saturday evening. In addition to the snow, a well
mixed blyr is present as cold air advection occurs. Net result,
strong and gusty winds. Forecast soundings indicate at least
sustained 20-25 mph with gusts at least over 30 mph. In the heart of
the strongest lake convection, think these numbers end up to 30 mph
with gusts to 40 mph. That spells trouble as temps will be dropping
into the lower 20s or even upper teens and thus blowing and drifting
snow will be MUCH more of an issue than we saw with the last Metro
Buffalo lake snow event the day after Christmas. The strong winds
may hold down total snow amounts (higher winds crush the dendrites
and lower the SLRs other than what would be given the thermal
profile shown), but for now have starting point of over a foot in
many areas within the lake plumes off Lake Erie and Lake Ontario.
Bullseye at least right now would be Buffalo Metro off Lake Erie and
Watertown/Fort Drum off Lake Ontario. Winter storm watches have been
issued for this potential high impact event in terms of snow and
wind.

Lake snows will diminish on Saturday night as first leading stronger
shortwave exits east. General synoptic snow will begin to spread
into western NY after midnight, but winds will shift enough to
prohibit lake enhancement as the wave arrives.
.LONG TERM /SUNDAY THROUGH WEDNESDAY/...
The core of arctic air will drop across western portions of the
Ontario province on Sunday. As its associated trough axis dives
across the Great Lakes, a surface low will pass to our south, with
some model disagreement on its track and strength. This could bring
a light general snow on Sunday, but in its wake it definitely will
be colder heading into next week. GFS/GGEM both drop 850mb
temperatures to around -25C, with the `warmer` ECMWF down to around
-19 C. This will support highs in the teens for Monday and Tuesday,
and even that may be optimistic in some areas if the colder guidance
verifies. Bitterly cold wind chills can also be expected.

In addition to the cold, this will establish a pattern favorable for
lake effect snow. Wind direction and moisture will be key, and it
remains too far out to pin down the details. In general, a
prevailing WSW flow will place the traditional snow belts east of
the lakes at the greatest risk. Does seem at least initially early
next week, better focus for the lake effect may be just south of
where the weekend event is expected to occur. However, bands will
meander, with the potential to impact the cities of Buffalo and
Watertown at times. Overall, this WSW flow will diminish the risk
for heavy snow for counties immediately south of Lake Ontario,
including the Rochester area. Though if winds are strong enough at
least advisory level snows could reach into western portions of
Monroe county.
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Just now, BuffaloWeather said:

I like how they said starting point is a foot. The potential is sky high with this if we can get a strong band going.

Agreed. I do think you were on to something with the strong winds and they mentioned the dendrites getting shredded but I agree if this locks over the metro for 12 to 18 hours all bets are off...that’s a full length if a basically wide open lake with aligned winds and moisture...

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2 minutes ago, Thinksnow18 said:

Agreed. I do think you were on to something with the strong winds and they mentioned the dendrites getting shredded but I agree if this locks over the metro for 12 to 18 hours all bets are off...that’s a full length if a basically wide open lake with aligned winds and moisture...

Yeah I think this first event is a KBUF special. We will get hit here but not as much. I'm off all week so might set up shop at my dads house.

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Friday Night
Snow. The snow could be heavy at times. Areas of blowing snow. Low around 22. Breezy, with a southwest wind 20 to 23 mph, with gusts as high as 37 mph. Chance of precipitation is 80%.
Saturday
Snow. The snow could be heavy at times. Areas of blowing snow. High near 23. Windy. Chance of precipitation is 80%.
Saturday Night
Snow showers likely, mainly before 1am. Areas of blowing snow before 1am. Breezy.
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Just now, ayuud11 said:

I just hope those high winds don’t tear apart the bands like they did with the Jan’16 event.

Yeah sustained of 20-25 are not strong enough to do that. Gusts to 40 also won’t do that...the snowflake size will be sheared but with a uniform SW glow I’d be more concerned if there was directional shear I’d be concerned...I also just had to shake my head...Todd santos went to where the NWS is going with more than a foot and actually mentioned, on air their model is handling it poorly...so 30 minutes prior the other met said 3-6” and dry air...the other met says over a foot...

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