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12/29 - New Years Storm Threat Discussion


Dsnowx53

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Fair Warning the Euro may not show tons of QPF . So no one jump out of a window . It sometimes misses QPF close in .

The key to Euro is how much it deepens the LP and where the surface feature ends up-

The high RES should take it from there .

That's a good point. The ECMWF can definitely sometimes underdo precipitation right before an event.

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Wow, GEFS ENS mean has a 992 mb low on the BM. That's pretty impressive.

Down from 1008 only 12 hrs later -16 mb in 12 hrs , all this talk of mixing I think people

are missing that the models always warm the coastal plain and

when u send a deepening system to the BM and the 850`s are draped to your south winds are Northeast , Nothing is a layup , but i dont think its a hard call .

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Yanksfan,

How does bufkit look for KSMQ? Thanks in advance.

About the same as Morristown which I already posted. For those interested, here is KEWR

121229/1500Z 27 08004KT 30.8F SNOW 6:1| 0.1|| 0.00|| 0.00|| 0.014 6:1| 0.1|| 0.00|| 0.00|| 0.01 100| 0|

121229/1800Z 30 07005KT 33.2F RASN 0:1| 0.0|| 0.00|| 0.00|| 0.053 6:1| 0.1|| 0.00|| 0.00|| 0.07 65| 0| 35

121229/2100Z 33 02008KT 33.3F RAIN 0:1| 0.0|| 0.00|| 0.00|| 0.097 6:1| 0.1|| 0.00|| 0.00|| 0.16 9| 0| 91

121230/0000Z 36 35008KT 31.9F ZRSN 0:1| 0.0|| 0.00|| 0.00|| 0.065 6:1| 0.1|| 0.00|| 0.00|| 0.23 69| 1| 30

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that is what I thought...what a winter

Even EWR is borderline but would probably be able to stay all snow with decent enough rates... temperatures there hover just above 0C. My LGA bufkit file wouldn't load for some odd reason. Even New Brunswick briefly goes over to rain with a 1.3/0.9C surface.... it goes above freezing at 920 hPa....

I'm not saying that this will verify but I simply wanted to clear up any idea that the GFS was favorable for NYC east or central Jersey.

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I was going to say that I think at this point for folks from the city on East, and even those living in the immediate western burbs, hope that the trend of a more amped up solution continues so that the better dynamics get onshore and help cool the column. Development of the low quicker might get a CCB cranking early enough to save everyone.

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Even EWR is borderline but would probably be able to stay all snow with decent enough rates... temperatures there hover just above 0C. My LGA bufkit file wouldn't load for some odd reason. Even New Brunswick briefly goes over to rain with a 1.3/0.9C surface.... it goes above freezing at 920 hPa....

I'm not saying that this will verify but I simply wanted to clear up any idea that the GFS was favorable for NYC east or central Jersey.

With temps/dewpoints being something like 35/25 at worst when this comes in and virtually little onshore component of any magnitude I can't see how this is anything but snow unless as Snow88 said the storm literally tracks on top of us, this is probably the usual situation of the GFS not being able to resolve the evaporational cooling in the BL in marginal cases.

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The only way I can see this being a rain event for the coast is if the storm trends even further west.

there are hundreds of examples where a storm was east of us in winter and it rained. There just isnt any real cold air around...and its too weak/far east to produce its own cold air..plus there isnt going to be a CCB at this latitude.

Am I saying its DEFINITELY going to rain, NO. But its 50/50, at best, for you and I...

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Similar thing happened with the light Christmas Eve event. GFS was extremely warm, had us all rain and temps in the low to mid 40's. In reality, temps were in the mid to upper 30's with snow for about half the event. I'm not buying it. A more amped solution will help everyone, with more precip and colder air.

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I was going to say that I think at this point for folks from the city on East, and even those living in the immediate western burbs, hope that the trend of a more amped up solution continues so that the better dynamics get onshore and help cool the column. Development of the low quicker might get a CCB cranking early enough to save everyone.

i agree..a weaker more east storm does nada for us

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With temps/dewpoints being something like 35/25 at worst when this comes in and virtually little onshore component of any magnitude I can't see how this is anything but snow unless as Snow88 said the storm literally tracks on top of us, this is probably the usual situation of the GFS not being able to resolve the evaporational cooling in the BL in marginal cases.

Agreed with this. The RGEM, which is a 4DVAR short term high res model even had its snowfall algorithm as very favorable for most coastal areas. I'm really not too worried about a low res model showing a warm BL considering the factors you stated.

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Anybody have the bufkit for HPN

121229/1500Z 27 VRB02KT 29.0F SNOW 13:1| 0.1|| 0.00|| 0.00|| 0.008 13:1| 0.1|| 0.00|| 0.00|| 0.01 100| 0| 0

121229/1800Z 30 09003KT 32.4F RASN 0:1| 0.0|| 0.00|| 0.00|| 0.039 13:1| 0.1|| 0.00|| 0.00|| 0.05 84| 0| 16

121229/2100Z 33 03006KT 31.0F ZRSN 0:1| 0.0|| 0.00|| 0.00|| 0.075 13:1| 0.1|| 0.00|| 0.00|| 0.12 80| 1| 20

121230/0000Z 36 36007KT 28.8F SNOW 19:1| 1.6|| 0.00|| 0.00|| 0.085 18:1| 1.7|| 0.00|| 0.00|| 0.21 100| 0| 0

----------------------------------------------+----++-----+-------------++--------------++-------------++-----------+---+---

121230/0300Z 39 33006KT 27.2F SNOW 10:1| 0.1|| 0.00|| 0.00|| 0.013 17:1| 1.8|| 0.00|| 0.00|| 0.22 100| 0| 0

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Adding insult to injury on the 12Z GFS is that while the column could be supportive of snow at a place like JFK there is no negative omega in the snow growth region... better snow growth only starts taking place once the surface is quite warm.

It's going to be interesting as the best lift transfers to the coast with the surface low developing rapidly.

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