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November 2025 general discussions and probable topic derailings ...


Typhoon Tip
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1 hour ago, CoastalWx said:

6z euro AI is sort of what I was hoping to see for any wintry chance in SNE. Temps are borderline, but that’s how you would do it. Day 9-10 so you know the rules….but just pointing out the setup. 

Just need to see the same model output in the 2-4 day range

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Yeah maybe.  It's a tweener system.   It's in between teleconnectors, wedged in that timing between more major or obvious signals.  If it is even real, confidence will come down to handling the daily noise.   I mean, when it is resulting/connected to larger mass field change, confidence in actually having 'something' on the charts can be assessed at longer leads... But that thing's pretty invisible to the indices. 

Tweeners are real though.  They can sting.  "Little critters that bite" are tweeners. Or like the 1997 Dec 23 snow bomb storm was a tweener.  I saw 16" from that one.

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2 minutes ago, Typhoon Tip said:

Yeah maybe.  It's a tweener system.   It's in between teleconnectors, wedged in that timing between more major or obvious signals.  If it is even real, confidence will come down to handling the daily noise.   I mean, when it is resulting from larger mass field change, confidence in actually having 'something' on the charts can be assessed at longer leads... but that thing pretty invisible to the indices.  Tweeners are real though.  They can sting. 

Yeah, by no means am I suggesting it will happen, it was one of those things that I was envisioning that maybe we can sneak in with the block helping him provide some cold air, especially for the interior.

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59 minutes ago, CoastalWx said:

Yeah, by no means am I suggesting it will happen, it was one of those things that I was envisioning that maybe we can sneak in with the block helping him provide some cold air, especially for the interior.

yeah I added a couple examples of in-betweeners.    Feb 2002 10" in 3.5 hours along the Pike E of ORH and throughout Boston proper, from a flat vort max rippling through. It was so flat that there was but a west wind while it was happening. Forced NWS to go from a partly sunny with flurries forecast to a Winter Storm warning cut-in now-cast adjustment in a scrambling media effort.  That's definitively showing that timing crucial variables can generate fun stuff and not be well modeled. 

Then there was Dec 23 1997 ...one of my favorites.  

It's close to my heart because I was interning with Harvey Leonard that semester, and I remember telling him the day before that I was suspicious about the setup. The ( then ) ETA FOUS grid, ( a dead art form) had a vertical profile over Logan something like +2|+1|-3   ... which corresponds to 34.5 F at 980 mb, 33 F at 900 mb, at 27 at 800.   The VV column was like +22 ...  whaa  Uh, that's a pig ton of implied upward motion. Underneath which it was dropping over a half inch of QPF.  All rain didn't add up in my mind.  Should have no problem having fall rates of snow over come that gossamer lower warmth.  Yet, NWS was forecasting cold rain inside of 128, with 1-3" of wet glop in the Worcester Hills.  At a larger synopsis, there was a small but important +PP sitting over N Maine while this event was approaching in the guidance - this was showing up as damming in the surface pressure contours.  I told him more snow. 

So Acton Ma, and I awoke around 7:30 or 8 am to slate gray blue tinted light and flurries at 19 F...  umm.  What happened was it remained like James Webb Telescope clear until about 5:15. Then, just before dawn, the cirrostratus leaf edge abruptly advanced over and cold capped.   800 mb ( mind you ) was already less than 0C -   there was no way to switch the column.  I set my coffee, most down curious what the radar must be showing, but just then my primitive Captain Kirk flip phone captured my attention, "You have 14 new messages".  It was this guy I knew that worked at Aldin Electronics( long defunct ) - he was in the EPERB department, which was a weather monitoring tech for marine.  First and foremost, he and I were in a dead heat for weather dweebiest contest and the mother fucker beat me to it.  At his urgency I opened the radar and it was 60 dbz returns over an area twice the size of fuckum Rhode Island over eastern CT up to the Pike. That globular region was surrounded by 30 to 50s. Yellows and fiery oranges you'd see in plains super cells.  The deep green leading edge was just then arriving overhead.  "OH shit!" I leaped to my feet and rush to the window; the flurries abruptly had indeed become steady snow. Tiny little uniform aggregates reducing the visibility abruptly.   "That's isn't just bright banding or sleet. Oh my god"

An hour later, visibility was   0    not 1000 feet where ASOS might only say so.  It was 0    Could not see the tree in the front yard.  So okay ...maybe visibility was technically 20 feet.  I saw 7" fall in a single hour in that as the thunderstorm colored rad blog moved over head.  And snow texture never deviated. The temperature never wen above 27.  16.5" most of which fell in 4 hours.   Straight down.  No wind.  So dense that there was no sound except the gritty crumbling of tiny aggregates shattering down your shoulders, in 0 visibility.  

I'd never seen anything like that. It was unique.  I've seen 0 or close to 0 visibility on several occasions.  Wind was usually a part of those. This had nothing but a single expression: choke snow fall rates.

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