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3/1-2/2015 SWFE/Wave Discussion


SR Airglow

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There's actually like a 500mb band that could get powderfreak, lol...exactly the type of storm where he'll post "models only had 2-3" of snow here but its nuking at the mountain and we already have 6"!!"...but on the ML fronto charts it looked like Rt 2 in MA up into S VT/NH could see a little bit of enhancement....it's not overwhelming or anything..but some of the models there were spitting out like 2" of snow and I wouldn't be surprised if it was like 4-5 there.

 

There is like a mid-level deformation zone up here or something...definitely a lingering mid-level area of weak lift with some orographics occurring under it tomorrow morning. 

 

I think we may have a shot at some semi-blocked SW flow in the lower levels during the first half, which may help squeeze out any available moisture. 

 

That SW flow upslope is what turned the last event from 2-3" into 8-9". 

 

feb_21_wow_zpssrxieopd.gif

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looks like RGEM now. Everything looks good and on track . But there's always gonna be worriers

 

 

GFS didn't look like the RGEM. IT was about a tenth to 0.15 more paltry on QPF...probably because it didn't have quite as good lift.

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We all know the caveats, but I would let it ride for now as far as the forecasts. They'll probably be some surprises and I don't see a reason to rule out perhaps a weenie band near and north of the pike into SNH like Will mentioned. You guys are going to have radar haluccinations for the next 3-5 hrs because the real good stuff isn't probably until after 6 or so.

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For learning purposes only...

How are people predicting best areas of mid-level frontogenesis?

 

I assume this isn't deformation because it's a pretty weak system, so I'm looking for confluent winds at 500 or 700 or 850 but not seeing anything very robust...  Looks like maybe at 03z there is some converging of 850 winds over northeast MA, but not obvious to me... maybe the maps I have don't have the resolution for this.

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For learning purposes only...

How are people predicting best areas of mid-level frontogenesis?

 

I assume this isn't deformation because it's a pretty weak system, so I'm looking for confluent winds at 500 or 700 or 850 but not seeing anything very robust...  Looks like maybe at 03z there is some converging of 850 winds over northeast MA, but not obvious to me... maybe the maps I have don't have the resolution for this.

 

This isn't your classic system at all. The 850 winds you touched on, are a start. Basically anywhere where you try and pack the isotherms together are a sign of frontogenesis. There is a weaker signal at 700 off to the north, but IMHO, it's more the 850-700 zone in this one. 

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ALY thinking NAM will redevelop,somewhat. ..I still am sticking with 6" IMBY...depending on see ondary formation

..WITH THE NAM SHOWING SOMEWHAT HIGHER AMOUNTS AS

IT IS INDICATING SECONDARY CYCLOGENESIS SOUTH OF LONG ISLAND. AS A

RESULT...THE NAM IS ALSO SHOWING GOOD POTENTIAL FOR SNOW GROWTH

ACROSS THE SOUTHEAST PORTION OF OUR AREA

WE ARE THINKING THE BEST

POTENTIAL FOR THE HIGHER END SNOW ACCUMULATIONS NEAR 6 INCHES WILL

BE OVER SOUTHERN PORTIONS OF ULSTER AND DUTCHESS COUNTIES IN

NY...AND SOUTHERN BERKSHIRE AND LITCHFIELD COUNTIES IN WESTERN NEW

ENGLAND. WILL CONTINUE TO USE A 13 TO 1 SNOW TO LIQUID

RATIO...ALTHOUGH THIS COULD VARY ACROSS THE AREA.

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This isn't your classic system at all. The 850 winds you touched on, are a start. Basically anywhere where you try and pack the isotherms together are a sign of frontogenesis. There is a weaker signal at 700 off to the north, but IMHO, it's more the 850-700 zone in this one. 

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This isn't your classic system at all. The 850 winds you touched on, are a start. Basically anywhere where you try and pack the isotherms together are a sign of frontogenesis. There is a weaker signal at 700 off to the north, but IMHO, it's more the 850-700 zone in this one. 

 

Thanks man.

Yeah was poring over thermal packing and winds at 850/700/500, definitely not the strongest signal. We shall see.

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This isn't your classic system at all. The 850 winds you touched on, are a start. Basically anywhere where you try and pack the isotherms together are a sign of frontogenesis. There is a weaker signal at 700 off to the north, but IMHO, it's more the 850-700 zone in this one. 

 

 

Thanks Ginx, without access to that predictive mapping, those are the areas I had guessed for frontogenesis just looking at 850 winds... southern MA with maybe some into northeast MA. Really subtle.

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2-4 will probably do it for you and I. 

 

Agree, though RGEM argues for the higher end of that, + good ratios maybe we can push 4. 

 

Yesterday I was thinking 3-5 for Boston metro, but trends are going drier so I'm less sure.

Lift is not the best up near the pike, and add to that Logan 29/9... that's alotta moistening that needs to happen.

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Agree, though RGEM argues for the higher end of that, + good ratios maybe we can push 4. 

 

Yesterday I was thinking 3-5 for Boston metro, but trends are going drier so I'm less sure.

Lift is not the best up near the pike, and add to that Logan 29/9... that's alotta moistening that needs to happen.

 

Yeah I would not rule out 4-5 either..just my higher confidence range. Probably could narrow it to 3-4.

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More weak sauce up this way. The nice thing about this part of the season onward is that with my south-facing property I don't need to bother doing much clearing after these meh events; it gets vaporized on its own pretty quickly, even without a torch.

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I went 2-5" up here..mostly 2-4" tho....mentioned to cover for weenie band. 3-6" inside 128, and 4-7" for Bristol and PYM counties down to cc canal.

These nickel and dimes should be enough for BOS but you are going to need at least that and a strong warning snowfall right?

Also Ray, back in the first Blizzard. I recall you were asleep and the currier and Ives snow kept reforming (ne mass) and even pushing back to just past your area for hours and hours. I am certain your area saw a minimum of 1" additional after the 28.5" you recorded. Probably more like 1.5". I was watching the radar very closely that night and it just kept reforming

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