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12/19 - 12/20 Storm Discussion Thread

hammer

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Now trends from NWS are going towards a non-event... :sad:
.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
-- Changed Discussion --
OVERALL...MAINLY DRY WEATHER WITH ANOMALOUSLY COLD TEMPERATURES ARE
EXPECTED THROUGHOUT THE FORECAST PERIOD. MOS TEMPERATURES ARE
PROBABLY TOO WARM...ESPECIALLY DURING THE DAYLIGHT HOURS...AT LEAST
AT THE BEGINNING OF THE LONG TERM PERIOD DUE TO CLIMO BIAS.
THEREFORE...HAVE LOWERED DAYTIME HIGHS. BLUSTERY CONDITIONS WITH
COLD WIND CHILL VALUES ARE ALSO EXPECTED...ESPECIALLY THURSDAY NIGHT
AND FRIDAY...AND THEN AGAIN EARLY NEXT WEEK. IT/S LIKELY THAT OUR
FORECAST HIGH TEMPERATURES FOR EARLY NEXT WEEK WILL NEED TO BE
LOWERED IN SUBSEQUENT FORECAST PACKAGES.

AS FAR AS THE POTENTIAL FOR ANY WEEKEND COASTAL STORM GOES...IT LOOKS
AS THOUGH PROBABILITIES ARE QUITE LOW AT THIS TIME. THE ONLY PIECE OF
GUIDANCE THAT DOESN/T TAKE THE SYSTEM WELL OUT TO SEA IS THE 00Z
GGEM...WHICH IN FACT DELIVERS SNE A HISTORIC SNOWSTORM LATE SAT INTO
SUNDAY. THE GGEM ACCOMPLISHES THIS BY RETROGRADING THE POLAR VORTEX
OVER JAMES BAY BY EARLY SATURDAY...AND THIS ALLOWS THE SOUTHERN
STREAM SHORT WAVE TROUGH TO AMPLIFY QUITE RAPIDLY...ALLOWING FOR
RAPID CYCLOGENESIS OFF THE NEW ENGLAND COAST. THE REST OF THE 00Z
MODEL SUITE IS NOT NEARLY ROBUST...AND THE GGEM IS A SIGNIFICANT
OUTLIER. WHILE WE ARE NOT FORECASTING A SNOW EVENT FOR SOUTHERN NEW
ENGLAND AT THIS TIME...WE ARE STILL AROUND 96 HOURS OUT SO WE WILL
HAVE TO KEEP THE DOOR CRACKED OPEN A BIT FOR A MORE AMPLIFIED
SOLUTION...AND THEREFORE A CHANCE THAT THE COASTAL STORM COULD COME
FURTHER WEST AND DELIVER A SNOW EVENT SATURDAY NIGHT INTO SUNDAY.
REGARDLESS...WITH CYCLONIC FLOW PRESENT THROUGHOUT THE COLUMN WE CAN
EXPECT PERIODS OF MOSTLY CLOUDY CONDITIONS WITH PERHAPS A FEW SNOW
SHOWERS.-- End Changed Discussion --
 

4aprice

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Now the Weather Channel mentioned this as well. Well now its not going to snow!

PS: Hope my statement is wrong!

Seems like we're missing a bunch of good opportunies. Most mets envisioned this period of time as a good set up for storms but the forecasts I'm seeing now are calling for cold and dry. Thank god for man made snow. This early season 2009/2010 has been a test of patience.

Alex

Lake Hopatcong, NJ
 

billski

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scott had some interesting comments on skivtl

I do see some similarities but this event will be no where near the
size/scope of that one. The March 4, 2006 event dropped 10" in downtown
Burlington, 14" at KBTV, 18" at Williston, and 30-40" of fluff on
Mansfield... most, if not all of it, falling overnight.

In all my Mansfield/Stowe ski days, that one is still without a doubt #1.
It is the upslope event that all upslope events are measured in my mind...
the forecast was for a dusting in the Champlain Valley and light/moderate
snows in the mountains. Then all the sudden 1-2"/hr snows broke out in the
eastern Champlain Valley with 2-4"/hr snows over the mountains...and it
continued all night. The NWS attributed it to the warm air advection from
the north (which is a very rare pattern) coupled with strong upslope flow
 

WinnChill

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Alex,

Yeah, it certainly is one of those pattern reconfigurations that have potential to deliver the goods! But it's the ol "if a tree falls in the forest, does it make a sound"? We can have a monster storm pass by just offshore and it would go unnoticed--but have it take a slight jog west and we get blasted. Did we see the potential...yes--did it produce a storm...yes-but it snuck by just far enough to where it only effected the fishes. Heck, this could happen all season with massive storms bypassing us by the smallest margin but it's not to say that it wasn't an active/stormy pattern. It's a fine line--that's why the forecasts have been highly changeable. I have to mention Accuweather's Joe Bastardi about the recent Houston snowfall where he mentioned you can forecast snow for Houston, but it stops just 20 miles north and everyone thinks you got it ALL wrong.

But, hey, it goes with the territory--the "nature" of the biz I suppose. And I'm not being defensive or trying to make excuses--just offering a little perspective, that's all. I'll keep checking the latest model trends and keep you posted.

Cheers!
 

Greg

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Seems like we're missing a bunch of good opportunies.

Actually, the two December events we got over-performed. Nothing major, but more snow and a slower changeover than forecast. I think the bigger one last week was forecast initially to go out to sea too and then the models brought it back as we got closer to the event. Hoping the same holds true here. Better than predicting something big and then the track goes out to sea, or worse up the Apps.
 

drjeff

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It appears more and more like this big, strong artic high pressure system that's moving in now, is just going to be a bit too strong to let the low coming up out of the gulf force it's way far enough West to make this a good storm for the East :( (Nantucket and Maybe Martha's Vineyard excluded ;) )

The good thing is that the computer models seem to be mainly in agreeance that this cold air is going to be inplace for atleast the rest of 2009, and that overall the storminess of the US, while not an epic, major levels right now seems to want to be active over that time, and with the cold air in place and the Atlantic still being relatively warm, any low that moves its way in our direction the next few weeks will have potential to be a snow producer if the storm track and storm speed are good! :)
 

WJenness

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Sorry guys, but I'm pulling for this one to not be a coast hugger...

Driving down (Myrtle Beach, SC) to see mom for Christmas, and leaving early Sat. morning...

-w
 

Madroch

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Models trending better for the weekend-- who knows, maybe another overperformer. Would love a few inches for Sun. Just so long as we don't over-correct the track and end up wet here in the flatlands.
 

hammer

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Sorry guys, but I'm pulling for this one to not be a coast hugger...

Driving down (Myrtle Beach, SC) to see mom for Christmas, and leaving early Sat. morning...

-w
Understand...I'll be driving to NJ the weekend after Christmas and I'd like it to be dry then.
 

4aprice

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Alex,

I have to mention Accuweather's Joe Bastardi about the recent Houston snowfall where he mentioned you can forecast snow for Houston, but it stops just 20 miles north and everyone thinks you got it ALL wrong.

Joe Bastardi just picked up my spirits. Video on the regular Accuweather site today. Recommended viewing.

Greg: I would agree that the two prior events over performed but the scuttlebutt I heard was that this period was going to be the Jackpot we want and to see the forecast this morning was a little disheartening. Hey at least the cold has come and the snowgun offensive can resume. I'm still on board the good winter train, its just testing my patience.

Alex

Lake Hopatcong, NJ
 

mikestaple

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It appears more and more like this big, strong artic high pressure system that's moving in now, is just going to be a bit too strong to let the low coming up out of the gulf force it's way far enough West to make this a good storm for the East :( (Nantucket and Maybe Martha's Vineyard excluded ;) )

The good thing is that the computer models seem to be mainly in agreeance that this cold air is going to be inplace for atleast the rest of 2009, and that overall the storminess of the US, while not an epic, major levels right now seems to want to be active over that time, and with the cold air in place and the Atlantic still being relatively warm, any low that moves its way in our direction the next few weeks will have potential to be a snow producer if the storm track and storm speed are good! :)

It will line up eventually - but this one looks like, at best, to be my ultimate nightmare. Nothing in the mountains and a foot in my "near the Cape" driveway. Bleeeh.
 

Glenn

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Still looks to be staying east...but it is only Wednesday....we've been in this position before.
 

polski

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The prediction I'm pulling out of my butt: This will be a Yawgoo Valley Mauler.

Meanwhile, dayside at NWS-Burlington doesn't seem as hepped up on Greens upslope snow potential this weekend as last night's crew was, but it seems you really never know with those things pretty much until the flakes start falling - and even then the jackpot locations & intensities can be quite unpredictable. Makes it tough for those of us 3 hrs drive from the typically "favored locations" but I pay attention nonetheless ...
 

polski

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btw Greens and Berks are getting a little upslope/lake-effect right now, per everyone's favorite radar. NWS zone forecasts say only a dusting to 2". Watch 1) some place get a foot of blower and 2) me kick myself for not being there tomorrow.

via Twitter as of half an hour ago:
@BoltonValley @UpslopeSnow: snow event so far: started around lunchtime, gaining momentum now and bringing bigger flakes. Accumulation: a little under 1".
 

drjeff

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Some upslope snow started at Mount Snow a bit after 1PM - Been watching a cat due some pushing around of snow after phase one of the snowmaking assault on the 1/2 pipe in one of their cams

http://www.mountsnow.com/livecamshot.php

Just ignore their base area cam right now as it's been frozen on the same shot for a couple of days. The summit cam and the 1/2 pipe cam are refreshing every 30 seconds currently.

The way this high pressure system is moving has the currently winds more from a Northerly direction than the West/Northwest direction that tends to bring on a substantial upslope event. Probably see a better chance of some "good" upslope winds in a few days as the core of the cold air move a bit further South and East
 

drjeff

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The prediction I'm pulling out of my butt: This will be a Yawgoo Valley Mauler.

...

I'm thinking that it will just be a "Rhode Island" sized mauling of Yawgoo ;) This artic high is a big strong one, and it seems to keep wanting to move a bit further East than many models have thought, which will likely act to keep the big modeled low that will likely be forming /moving out of the Gulf of Mexico in the next 36 or so hours too far to the East. Plus, this atmosphere is DRY and lots of virga (cloud level precipitation but not ground level precipitation) will happen before any flakes that may try and fall over land will reach the ground
 
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