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January 2 - 3 Winter Storm Potential


NEG NAO

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the most significant part of the 12z cycle was having the gfs join the bigger storm party

 

 

 

Yeah it's nice to have the two major globals in fairly good agreement on the evolution, though I expect we're still going to see more slight shifts in the next couple days. Usually by D4, the general idea will be close to reality but we're not close enough to breathe a sigh of relief just yet.

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The 15z SREF's are definitely wetter than 09z but still pretty dry as compared to the rest of the latest guidance.

 

The 15z SREF's are definitely wetter than 09z but still pretty dry as compared to the rest of the latest guidance.Why do you rely them - they are almost never correct.Also if you hate winter why are you in this forum?Just curious.Rossi

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Its gonna be real close if NYC sees a sub zero reading....if we can clear out very quickly behind the system Friday evening and have a clear night under that gusty north flow we may do it, if we don't however and have to rely on the high overhead the next night it wont happen, NYC cannot go below 0 under radiational cooling....may see alot of LI though see their coldest lows since the 80s.

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Its gonna be real close if NYC sees a sub zero reading....if we can clear out very quickly behind the system Friday evening and have a clear night under that gusty north flow we may do it, if we don't however and have to rely on the high overhead the next night it wont happen, NYC cannot go below 0 under radiational cooling....may see alot of LI though see their coldest lows since the 80s.

 

i think it's been discussed before but what wind does NYC usually get its coldest temps from, the NW or purely N-erly wind?? i know people mentioned the effects of the Hudson River and also some downsloping??

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The 15z SREF's are definitely wetter than 09z but still pretty dry as compared to the rest of the latest guidance. Why do you rely them - they are almost never correct. Also if you hate winter why are you in this forum? Just curious. Rossi

The SREF's are another valuable piece of modeling if you know how to use them. And hate winter weather? Really??

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The SREF's are another valuable piece of modeling if you know how to use them. And hate winter weather? Really??

 

I can make use of the NAM/NavGEM and even CRAS... have no clue how to use the SREFs beyond 48 hours anymore, they do not tend to really bias one direction or the other they just seem consistently all over the place.

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It's generally very poor outside 36+ hours, but it still can be used to look for general trends.

 

I still don't like how its fairly flat at this range when it typically is amped, there was a storm a couple or three years ago where the NAM refused to budge and then about 72 hours out everything else went suppressed...as crazy as it is, sometimes one model going against its usual grain can mean something,

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Its gonna be real close if NYC sees a sub zero reading....if we can clear out very quickly behind the system Friday evening and have a clear night under that gusty north flow we may do it, if we don't however and have to rely on the high overhead the next night it wont happen, NYC cannot go below 0 under radiational cooling....may see alot of LI though see their coldest lows since the 80s.

 

Yeah, we need the winds to stay up to keep the cold air drainage from the north going. The GFS still has light winds

by 12z Saturday and a surface temp of -1 in NYC. Fresh snowcover and a N to NNW wind continuing until

early Saturday would really help us out. Early January 2004 was a northerly wind that stayed up without

any snowcover around the region and NYC got down to +1. But the high coming east quicker would probably

mean the spots that radiate would do much better.

 

Date: 5 day AVN valid 12Z SAT 4 JAN 14

Station: KNYCLatitude:   40.78Longitude: -73.97-------------------------------------------------------------------------------LEV PRES  HGHT  TEMP  DEWP  RH  DD   WETB DIR SPD THETA THE-V THE-W THE-E   W     mb     m     C     C    %   C     C  deg knt   K     K     K     K    g/kg-------------------------------------------------------------------------------SFC 1024    76 -18.5 -20.2  86  1.8 -18.7 326   7 253.0 253.1 253.0 255.0  0.75
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