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Extreme Cold, Snow & Sleet: SECS 1/24 - 1/26


TriPol
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The NAM is not infallible when it comes to being the most aggressive with warm noses but agree that it could verify. 

I do wonder why in this instance it is the most aggressive - is it because it tracks the primary further north vs the other models? Does it show a stronger primary?
 

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23 minutes ago, MJO812 said:

What a mess it will be outside if we get 6 plus inches of snow and some sleet.

Oh yeah. Sleet has more bang for its buck-doesn't pile up like snow obviously but will thicken up the snowpack and be a huge pain to move. After 3/14/17 the snow/ice piles were crazy. I remember the Feb 2007 storm in central PA with 10-11" of thick snow/sleet that hardened up into cement. A week from now even though we shave a few snow inches off for sleet I doubt people will be complaining if they like snowpack staying around like me. 

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2 minutes ago, jm1220 said:

Oh yeah. Sleet has more bang for its buck-doesn't pile up like snow obviously but will thicken up the snowpack and be a huge pain to move. After 3/14/17 the snow/ice piles were crazy. I remember the Feb 2007 storm in central PA with 10-11" of thick snow/sleet that hardened up into cement. A week from now even though we shave a few snow inches off for sleet I doubt people will be complaining if they like snowpack staying around like me. 

We might set some modern snow pack longevity records with no warm ups in sight after the storm. That glacier will last a very long time 

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2 minutes ago, jm1220 said:

Oh yeah. Sleet has more bang for its buck-doesn't pile up like snow obviously but will thicken up the snowpack and be a huge pain to move. After 3/14/17 the snow/ice piles were crazy. I remember the Feb 2007 storm in central PA with 10-11" of thick snow/sleet that hardened up into cement. A week from now even though we shave a few snow inches off for sleet I doubt people will be complaining if they like snowpack staying around like me. 

The piles of black and yellow snow in Brooklyn are going to look great next week.

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2 minutes ago, BoulderWX said:

NAM should give pause. I hate the model but I think it’s very good at detecting warm noses. 

It can overdo it. We're flipping regardless but hopefully can get a bigger front end thump like the other models have. Problem is we still have 48 hours to go

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2 minutes ago, SnoSki14 said:

We might set some modern snow pack longevity records with no warm ups in sight after the storm. That glacier will last a very long time 

Yep, it will be hard as granite. The snowpack will contain the same water as anywhere else since we aren't transitioning to rain or going above freezing-it will just be denser near the coast. 

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I'm pretty confident it will taint, but I think the somewhat weak consensus in this thread is overestimating the magnitude of it. 

I looked at model soundings last night that showed the warmest part of the column at about -2C at my location aligned with a p-type map where we were deep into the purple.  Gives me more confidence in the NWS sticking to their guns.  The 3rd party p-type maps are often bizarre.

I'm eager to see NAM soundings once most of the storm gets within 60 hours.

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17 minutes ago, Stormlover74 said:

This is starting to remind me of that storm in Dec 2013 where we went from teens and snow over to sleet. It was a smaller storm but I remember the crazy temperature differential with like 13 in Sussex and 44 and rain in AC

That storm was one of the NAM’s shining moments (there aren’t very many). I remember everyone discounted it because, well it’s the NAM. But it nailed the midlevel warm nose perfectly and early. Even the other mesos didn’t pick up on it until it was almost happening and the globals completely missed it. These types of setups are the only reason why, IMO, the NWS shouldn’t totally retire the NAM. It’s literally the only thing it’s good at

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Sleet at least adds up and makes the snowpack last, we want to avoid rain though (NAM shows a bit at the tail end for southern parts of the city). 

 

Just need the NAM 30-40 miles south and I honestly don't care if we flip to sleet a bit earlier than modeled. 

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1 hour ago, snowman19 said:

There is still a big front end thump of snow before the mix to sleet, that’s locked in. Getting back to the NAM, Binghamton NWS is expecting a possible turn to sleet all the way up into Northeast PA in their new disco this morning: 

Models continue their jog northward for our winter storm Sunday into Monday. No major changes at this time, with still a significant snowstorm expected for the area with a widespread 10"+ with locally higher amounts possibly over 20". The finer scale models will be coming into play over the next 24 hours. It should be noted that the NAM and CMCreg are showing strong SE flow at H850. The NAM is notorious for doing very well forecasting the warm layers aloft and this will be something to monitor as we get closer. This warm layer aloft may not cause mixing per say, but it may significantly change snow ratios Sunday night across NEPA and possibly into the Southern Tier and this would produce lower snow totals in these areas if it comes to fruition. Also, mixing is not noted in our forecast at this time, however, a future change could be warranted if this trend north continues any further and this would also hinder snowfall totals across the southern forecast area some.”

You are right. However in the last storm it showed sleet to CT and we never turned to sleep. Its great but not always perfect.

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7 minutes ago, NorthShoreWx said:

I'm pretty confident it will taint, but I think the somewhat weak consensus in this thread is overestimating the magnitude of it. 

I looked at model soundings last night that showed the warmest part of the column at about -2C at my location aligned with a p-type map where we were deep into the purple.  Gives me more confidence in the NWS sticking to their guns.  The 3rd party p-type maps are often bizarre.

I'm eager to see NAM soundings once most of the storm gets within 60 hours.

If we have heavy rates we can overcome shallow layers a bit above freezing-we might get rimed flakes etc but it's when the rates are reduced and we get dry holes in the precip that the warm air can become more established. And sometimes there are sneaky warm layers that aren't captured well in the soundings. Seems like the warm layer that can flip us over would be around 750mb from what I've seen. In any case it will still snow a lot and hopefully by the time the sleet gets here we're about to shut it off anyway. That's a potent high pressure dome all that Gulf moisture is slamming into and it will take a while to warm it up. The dryslot will also be a consideration if we have a strong 700mb low tracking into Lake Erie. Dry air will pivot around the SE side of it. 

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53 minutes ago, BoulderWX said:

The NWS actually added an inch to my WSW - 12-17. Not sure what they’re looking at. 

They're going to adjust that downwards almost certainly I'd think, they've already started the process of lowering totals with the new update. I can't see a widespread 12+ outside of the NW burbs

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3 hours ago, wishcast_hater said:

URGENT WEATHER STATEMENT
NATIONAL WEATHER SERVICE – WINTER DISAPPOINTMENT DESK

ISSUED: Immediately, because hope is fragile

SUMMARY:
A significant winter storm is expected to impact the region. Forecast confidence remains high for heavy snow potential, followed by a dangerous transition to sleet, freezing rain, or the ultimate betrayal: plain rain.



HAZARDS:
• Initial excitement from model runs showing 18–30 inches
• Rapid emotional destabilization as warm nose appears
• Keyboard smashing, doom posting, and refresh-induced psychosis
• Statements such as “this storm is dead” at T-72 hours



SUICIDE WATCH (METEOROLOGICAL): IN EFFECT
A Snowlover Emotional Crisis Watch is in effect for the duration of the event.

Residents are advised:
• Do not do anything rash based on one model run
• Step away from social media during the sleet phase
• Remember: one band can still save the storm
• Refrain from declaring winter “over” before March



TIMING:
• Snow: Hope Phase
• Sleet/Freezing Rain: Anger Phase
• Rain: Acceptance (or complete meltdown)
• Post-storm: “Next system looks promising” Phase



PRECAUTIONARY/PREPAREDNESS ACTIONS:
• Touch grass (or snow, if available)
• Hydrate
• Do not fight family members over 850 mb temps
• Seek professional help if you start trusting the GFS blindly



FORECAST CONFIDENCE:
Low on precipitation type
High on emotional damage


.

agreed - makes one nauseous reading some of these Doom and Gloom - Debbie Downer posts about a little sleet mixing in cutting the double digit accumulation down a couple inches...I am not going to get involved in that nonsense . THINK POSITIVE !

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