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


TriPol
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Just now, Winterweatherlover said:

still very bullish 

I have noticed that they tend to air on the side of caution and lean towards the worst case. Better to prepare people for the worst and bust high than the other way around.

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39 minutes ago, donsutherland1 said:

For reference, here's the map though 1/26 0z. Typically, if one reduces the amounts by a category at this lead time, it's estimate is pretty good. As snow will continue to fall in parts of the Hudson Valley after 0z, it's current listing of 12"-15" there is reasonable. I think there will be some 18" amounts there.

image.thumb.png.f2f1f323401602906bb43b807a732471.png

That has me in the 12-15 range along with north shore of Long Island. 

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I'll be watching obs from VA late tonight with interest. The NAM/RRFS bring sleet rapidly through S and C VA overnight while the colder models (RGEM/HRRR/RAP) keep it snow. That should give us a good heads up regarding how quickly we are likely to mix or change over on Sunday.

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12 minutes ago, North and West said:

Checking in at halftime of my older son’s game; what is the storm actually doing at this moment versus what the models have shown? Thanks.

I’ll hang up and listen.


.

serad25.jpg

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1 minute ago, nycsnow said:

Euro AI is more snow than 6z

Well-it either scores a coup here or falls flat on its face. It’s supposed to build better results with experience-not sure how much it has with setups like these. It did pretty well with the Dec storms. 

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2 minutes ago, jm1220 said:

Well-it either scores a coup here or falls flat on its face. It’s supposed to build better results with experience-not sure how much it has with setups like these. It did pretty well with the Dec storms. 

It’s in the camp of the hi res (minus nam) and Ukie for sure 

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1 minute ago, donsutherland1 said:

So, it wasn't that storm. I am not sure what storm was involved.

I am not even sure what you guys were discussing since there are so many people posting all at once

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20 minutes ago, North and West said:

Checking in at halftime of my older son’s game; what is the storm actually doing at this moment versus what the models have shown? Thanks.

I’ll hang up and listen.


.

people have posted that THE NAM had Little Rock getting nada when in reality they already have 6 inches,,,,,,now back to the game

image.png

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1 minute ago, wthrmn654 said:

Should use the more accurate version of there forecast then pinpoint amounts.  This looks like a good snow forecast map. 

image.thumb.png.ea4ba78bbe7953ad33d5f513d05c5532.png

Still means they are going for 12 in CPK, but yeah for surrounding areas.

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1 minute ago, jm1220 said:

Well-it either scores a coup here or falls flat on its face. It’s supposed to build better results with experience-not sure how much it has with setups like these. It did pretty well with the Dec storms. 

so question from a lurker.  What is the difference between how the AI models adapt over time versus established? is it more pattern recognition versus manual calibration??

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21 minutes ago, North and West said:

Checking in at halftime of my older son’s game; what is the storm actually doing at this moment versus what the models have shown? Thanks.

I’ll hang up and listen.


.

I will try this again,,,,,,people posting that THE NAM had Little Rock getting nothing a=nd right now Little Rock has 6 inches,,,,now back to the kids game

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Just now, EastonSN+ said:

I don't get why they put the highest amounts on their pinpoint 

Range versus pinpoint #s i like because it gives a better idea if the variables in the forecast where mix leads to lower end but more snow means higher end.  I believe that's the expected # for select locations. 

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Just now, NYER72 said:

so question from a lurker.  What is the difference between how the AI models adapt over time versus established? is it more pattern recognition versus manual calibration??

I’m not sure of the exact algorithm but it’s supposed to print out predictions based on analysis of similar storms in the past and gain experience and therefore better predictions in the future based on verifications. I’m sure it would evaluate similar patterns at 500mb, analogs etc to come up with the predictions. I’m not sure how it directly evaluates current atmospheric conditions to come up with the predictions but it seems to match up pretty well with the operational EC. 

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