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Upstate/Eastern New York


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Weak ridging aloft across the Lower Great Lakes will give way to an
impending upstream shortwave that is in the process of diving
southeast from Lake Superior. Ahead of this system...winds will back
to a WSW`erly flow which will nudge lake snows back out over the
open waters of Lake Ontario and then direct lake effect snows into
Oswego county overnight. As the shortwave and corresponding surface
reflection nears the region lake effect snows will then become
reinvigorated as synoptic moisture ramps up and equilibrium levels
climb over 12K feet. This will be the much need juice to provide an
additional 3-6" inches across Oswego County overnight. This feature
will also produce some light snow showers with some minor
accumulations expected across the region overnight.

As the surface low crosses the lakes during the wee hours Thursday
morning a wind shift will occur to NW`erly in its wake. This will
send all remain lake snows southeast of Lake Ontario. Expect
additional accumulation of 1-3" in the most persistent snows
southeast of lake Ontario Thursday. All remaining synoptic snows
will quickly diminish with its departure by mid morning. Behind this
system high pressure will begin to take hold across the lower lake
and synoptic moisture will get stripping away. Additionally,
equilibrium levels will lower and lake snows will continue to weaken
and then diminish. Otherwise, outside of the lake snows it will
continue to be cold with highs expected in the upper teens to lower
20s areawide which is well below normal. Where should we be for this
time of year, upper 30s near 40F.
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3 hours ago, TugHillMatt said:

I would love to see the band hit during the day. Seriously, every one of our heavier events has hit at night. They started usually with Sw flow during the afternoons, then shift West in the evenings, then NW overnight.

I actually meant to ask if this is a common set up with different variables, or just coincidence.

 

1 hour ago, Phillifan22 said:

What you’ve noted is not a coincidence. Studies have shown lake effect tends to weaken during the day (especially in late fall and early spring when daylight is longer and the sun angle is higher). This weakening is caused by a decrease in the temperature contrast as the air above and around the lake (as well as the land) warm. It goes back to the fundamental of lake effect, cold air over a warm lake.

 

While Phillifan is right... I think what Matt is referring too has just been luck or a lack-thereof. One thing that may also contribute is the land-breeze fronts (e.g. Steenburgh and Campbell) that could be contributing, especially overnight where lake vs. land temperature differences are maximized. But I think for Matt's question, the answer is pretty much down to luck. I remember a few years back when phillifan and I did forecasts for the DOT there seemed to always be heavy lake-effect during the day due east of the lake, so it's probably just random chance. 

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17 minutes ago, wolfie09 said:

This band is all over the place lol 

I keep going in and out of heavy snow, being fringed just to the north at the moment.

Looks good for you matt!

3 hours of HEAVY snow now and continuing. Haven't measured, but friends are reporting 3 inches per hour.

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6 inches in 4.5 hours and still snowing. Had a few periods with 2 to 3" per hour rates...but seems like 1" per hour was the average.
Walked around and took some measurements. 20 to 24 inch snow depth in my yard which gets southern sun...so no doubt we have 2 to 3 feet snow depth in many areas not exposed to sun and wind. Snow retention is key here.

 

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Southern area's have run into some bad luck..

We keep getting WNW flow during the day and west-wsw over night lol..

Today for example GFS has WNW flow starting around 10am and then backs flow west again around 7pm..Not sure how much band would be left by then though. 

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