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2/15 Snow threat


SnowGoose69

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Slightly concerning to me is that each consecutive run of the rap (I know I know, but it is useful for watching trends as we get closer) is that it is now largely caving to the NAM's depiction of mid level features. Does not develop a closed 700mb low thru 18 hours, and it matches perfectly with the NAM at 850mb

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sounds similar to last February where LI, CT, and coastal NJ jackpot. not saying about the 30" plus amounts but saying its a tightly wound system with a tight QPF gradient and accum. drop offs

The upper lows seem to be trending better which means we should at least get some moderate snow for a while. The CCB on the NAM is insanely compact though, like 75-100 miles across. Probably overdone on that but there's probably a tight gradient somewhere.

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850's fine, but SFC temps struggle at the start a bit on the 21zSREF

That's my fear here. Whoever gets in the heavy banding will be fine though. I really think there will be some big surprises as someone gets se insane 3" hour rates. Lets just hope it happens as far west as possible and we don't see a mtk special like in the late 90s

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The upper lows seem to be trending better which means we should at least get some moderate snow for a while. The CCB on the NAM is insanely compact though, like 75-100 miles across. Probably overdone on that but there's probably a tight gradient somewhere.

 

The RAP is slowly caving towards the NAM depiction with each run. No closed 700mb anymore and abroad diffuse 850mb low over the area by 18. I know its the rap at the end of its run but I am slightly concerned. It seems with the 500mb, that everything is going to be quite broad until it reaches SNE. Im sticking with my call of a general 2-4 across NJ into NENJ (NWNJ could get slightly more as the initial band becomes enhanced), then NE of NYC gets into the 3-6+ range. The cutoff for the heavier stuff literally appears to be NYC.

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Jetspens87 "RAP is leaning towards the NAM not as organized"-"the NAM HI-RES looks.....nice to say the least". Well looks like some good ol' model tug of war tonight. Only 24 hours before we did the same thing lol

 

LOL seriously, The rap has been trending towards the NAM depiction of the mid level features. The thing is on the HIRES....well ive got nothing actually hah. Ill go with "It's the NAM" to cover my bases hah.

 

Actually, the totals map looks pretty similar to OP

 

http://www.meteo.psu.edu/~fxg1/NAMSFC4_0z/ptot31.html

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Its entirely possible the RAP may be similar to the NAM on the upper air features but the NAM sure looked like it went alot closer to the RGEM/GFS on its precip depiction at 00Z.

 

Sure did, and even the upper air features the NAM has are not terrible by any stretch, just not conducive for anyone hoping for more than the 2-4" variety unless NE of NYC

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Tonight's RGEM has a deformation band over NYC. Gives us a decent hit. This storm keeps getting more interesting by the moment. I am thinking of upping the amounts, let's see what the GFS and GEM have to say.

 

Its evolution from 15-18Z is just crazy, it destroys the inland area of snow and next thing you know there it is over NYC.

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Tonight's RGEM has a deformation band over NYC. Gives us a decent hit. This storm keeps getting more interesting by the moment. I am thinking of upping the amounts, let's see what the GFS and GEM have to say.

 I hear ya, Im sticking 2-4" for NJ and 3-6+ as you get NE of NYC, I think NYC itself is the major cutoff. I just cant up my amounts based on a deformation band right now, too mesoscale right now for my liking , almost got burnt last night so ill stick with the general 2-4.

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Since The ARW Member run off of the GFS, One could assume that the GFS will show something more amplified and similar to its 18z run. On The 18z, it closed off to the south at 700mb(then opened up on the next frame) Which ultimately enhanced lift and threw back some good precip into the NYC metro area. Anyways, whether we get a small, moderate, or big hit; this could have been much more. If we had something to slow this down or if this baby went negative a little faster than this would have crushed us. Looks like a 6 hours too late type event. The low pressure system undergoes EXTREME bombgenesis right as it's passing to the southeast of Long Island and into the Cape eventually landing into the Gulf Of Maine as a potentially Sub 970 System. This will be a beauty on satellite. I'm just hoping the NyC doesn't get shafted with the re developing coastal low as the primary is dying out. The GFS had good Frontigenesis extending across Long Island and into NYC while The NAM does not and only had Frontolysis with barely any lift.

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