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3/17-3/18 Storm Threat Discussion


Zelocita Weather

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Its the stronger shortwave in New Mexico on the GFS when compared to the NAM which makes it bury the main 500mb low...So close. 

So interesting, how in certain instances, stronger, can lead to 'weaker'. In the end we arent taking baby stapes , we r taking major steps towards an MECS today. Strong suspicion EURO will follow in step.

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I'd love for all that energy strewn about the Eastern Seaboard to consolidate into one dominant low to allay PV concerns.

 

Even at hour 36, the differences between the NAM and the GFS are noticeable with both the southern disturbance and the Pacific shortwave. I know one red tagger pointed out that the NAM should theoretically have the upper hand with smaller-scale features in the short range, so I'll run with that for now.

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this run is perfect. Less warm air intrusion. Take what you can get. doubt it gets much better than this run.

 

Exactly. There's a reason we only get 12" snowfalls every 4 years, on average, in Central Park, and only 5, ever, in March. People should be ecstatic with the trends tonight, not whining about it not being a NESIS Cat 5 storm, especially given that it could still end up mostly missing us or bringing in more warm air for sleet/rain.

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I will take my chances with that.

I agree full phase is protection against a beastly PV. But you also need the blocking, hence the conundrum. but 72 hrs out and we r trending in  the right direction. If we trend at  same % tomorrow we will all be licking our chops come this time tomorrow. Lets face it tomorrow, in all likelyhood is howdown day.

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Please be cautious, the previous storm shifted 500 miles 48hrs prior to non-arrival. 

there's more room for non suppressed idea. The pv isn't one big concentric buzzsaw. It's elongated and NE of us, with HP on the back side throwing down the cold air. 

the modeled RH fields are completely different than the previous storm.

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Hey keep in mind folks... This looks like a Sunday Night - Monday event yeah? Remember the continuous GFS runs showing widespread 12"+? That started trending AWAY at 12z that Friday beforehand... 

Obviously each storm is different... But tomorrow night if the GFS shows a similar solution as tonight I wouldnt be using references to the storm a few weeks ago that was a miss.. (Although things do obviously change... Saturday will be just as important)

Either way, in this case trend is our friend on the NCEP models.

 

Thinking 3-6"+ is definitely realistic at this point for the metro...

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Hey keep in mind folks... This looks like a Sunday Night - Monday event yeah? Remember the continuous GFS runs showing widespread 12"+? That started trending AWAY at 12z that Friday beforehand... 

Obviously each storm is different... But tomorrow night if the GFS shows a similar solution as tonight I wouldnt be using references to the storm a few weeks ago that was a miss.. (Although things do obviously change... Saturday will be just as important)

Either way, in this case trend is our friend on the NCEP models.

 

Thinking 3-6"+ is definitely realistic at this point for the metro...

Thats a fair presumption at this point, not so much because im sold on the Nam or GFS per se but because GGEM and CMC have been solid ( though 1 is discounted as outlier by UPTON earlier). But Outlier or not when a model is being consistent 1 has to ask why others are going in that direction. Also bear in mind almost ALL QPF is from over running which is a great thing and produces a climotogoical MECS. Now just imagine if the SLP drives up the coast following that ;)

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Also along with the highly bullish GGEM and NAM ( and increasingly the GFS) do NOT forget the Ensembles means of the Euro and GFS that are more bullish than the ops. I know we r  gun shy after last 2-3 events but , at this point, it IS looking good, Uptin has accordingly gotten more confident in verbage.

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Also along with the highly bullish GGEM and NAM ( and increasingly the GFS) do NOT forget the Ensembles means of the Euro and GFS that are more bullish than the ops. I know we r gun shy after last 2-3 events but , at this point, it IS looking good, Uptin has accordingly gotten more confident in verbage.

Can you link or paste Upton's latest? On my phone here

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Can you link or paste Upton's latest? On my phone here

 

Actually, nothing new from NWS-NYC since the regular ~4 pm AFD, which said...

WHILE IT WILL BE ANOTHER DAY OR TWO BEFORE THERE IS BETTER

SAMPLING OF THE UPPER LEVEL DATA ASSOCIATED WITH THIS...TODAYS

OPERATIONAL MODELS HAVE TRENDED FURTHER N...WHICH IS A STEP IN THE

RIGHT DIRECTION. POLAR VORTEX OVER SE CANADA WILL PROVIDE THE COLD

AIR FOR A SNOW EVENT...AND THERE IS A PERIOD OF OVERRUNNING BUT THE

QUESTION REMAINS HOW FAR N DOES THE CENTER OF THE LOW (AND THE

HIGHER QPF VALUES) GET. TIMING IS ALSO AN ISSUE.

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