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January 20-21 2012 Snowstorm OBS & Disco


earthlight

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Still a fairly large spread on the positioning of the 850 0c isotherm. This will make a big difference for many locations just south of NYC's latitude. It will be important to watch the surface low track tonight -- as that seems to be the tip off as to whether or not the mid level warming will surge a little farther north. The models that are bringing the H85 warming a tick north are also bringing the surface low slightly farther north into the Ohio Valley.

That is a really awesome graphic. One of these days I need to take a tutorial in modelology - would love to know how to access, read and analyze the models better and be able to post cool (and really useful) graphics like this; I used to do some computational fluid dynamics modeling way back when in grad school (guys I work with still do it, using Dynochem) in chem eng'g, but I've lost most of those skills. Maybe after retirement, lol...

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The faster the better for the area.

The short range models are supporting a faster start to the storm. Upton has most of the snow falling after 3-4 AM, although the short range HRRR/RR models are already showing the 20+ dbz snow bands moving in by 7z (2 AM) into NYC, with the moderate snow by the morning hours falling with temperatures still in the mid 20s supporting the higher ratios. With a faster storm, it's also possible that it ends a bit earlier than expected, perhaps by 12-1 PM, although we're probably going to get enough moderate snow to end up with at least 3-5" in NYC and 4-6" for northern NJ IMO.

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That is a really awesome graphic. One of these days I need to take a tutorial in modelology - would love to know how to access, read and analyze the models better and be able to post cool (and really useful) graphics like this; I used to do some computational fluid dynamics modeling way back when in grad school (guys I work with still do it, using Dynochem) in chem eng'g, but I've lost most of those skills. Maybe after retirement, lol...

Spaghetti plots can be very useful when looking at an ensemble. The mean is taken as truth too often, when in reality looking at the individual members often offers a better look at what's really going on behind the curtain. Here, we can see that the general spread is nearer to the Euro solution but probably a tick warmer than that. Also notice the two extreme outliers to the north, and a few to the south as well.

They've also nudged north from the 09z run (not just the mean, the spaghetti plots too).

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Still a fairly large spread on the positioning of the 850 0c isotherm. This will make a big difference for many locations just south of NYC's latitude. It will be important to watch the surface low track tonight -- as that seems to be the tip off as to whether or not the mid level warming will surge a little farther north. The models that are bringing the H85 warming a tick north are also bringing the surface low slightly farther north into the Ohio Valley.

SREF_Spaghetti_H8_0__f024.gif

Because Long island actually runs north a bit from W--> E, looks like eastern sections, from this map, have more room to work with than western sections...so im actually more worried here in northwest nassau than id be out in mid island suffolk

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Because Long island actually runs north a bit from W--> E, looks like eastern sections, from this map, have more room to work with than western sections...so im actually more worried here in northwest nassau than id be out in mid island suffolk

But you say you live in central Nassau.

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But you say you live in central Nassau.

I have an identity crisis.

Im further west in nassau than east, and further north than south...if nassau were divided into 4 quadrants, id be in the northwest quadrant....but im not in great neck/port washington area, which to me is really NW nassau.

So i am in a central location in nassau county, but meteorologically im in NW nassau...

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Great lakes radar is a bit underwhelming, while regional se is better than I thought it would be.....certainly does not look like your classic swfe, hopefully things consolidate later on east of the apps.

Surface obs in the midwest have been more impressive than radar reflectivities all day. Somebody with a pay for radar might have a better read. Earlier the northern IL stations were reporting heavy snow for several hours with (NWS mosaic) DBZ values below 20. Currently many stations in MI are reporting visibilities at or below 1 mile with reflectivities between 10 and 15.

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I have an identity crisis.

Im further west in nassau than east, and further north than south...if nassau were divided into 4 quadrants, id be in the northwest quadrant....but im not in great neck/port washington area, which to me is really NW nassau.

So i am in a central location in nassau county, but meteorologically im in NW nassau...

No, you have a :weenie: crisis

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I have an identity crisis.

Im further west in nassau than east, and further north than south...if nassau were divided into 4 quadrants, id be in the northwest quadrant....but im not in great neck/port washington area, which to me is really NW nassau.

So i am in a central location in nassau county, but meteorologically im in NW nassau...

Best post I've seen in a while

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when my friend got married he was sooo delirious and out of it too its huge deal man, just hang in there and make the most of it.....or atleast try :drunk:

Yea im workin on it, might just elope.

Sorry OT and Banter. Going to get drunk.

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Should be very interesting to get a look at the 00z data. The 18z data looks pretty spot on to the newer hourly RUC runs so I doubt we are going to see many changes. But the spread on the SREF was pretty wide so I would assume we're going to draw closer to a consensus.

It's also interesting to note that the Euro was on the cooler side of that SREF mean line. But the small differences are becoming magnified in such a tight-gradient situation.

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