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Mid FEB through March Threats/Snow Storms


mitchnick

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It's ok but if the low is going to take that track I would like to see a bigger surge of waa precip out in front. The weaker vort wasn't a great thing to see.

yeah could be.. not sold a strong low will be a good thing with no high but who knows. im tempted to already assume we'll get screwed. ;) 

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As long as euro is still bullseying raleigh..we're good

Ensemble mean track is very similar to the gfs. I see a raleigh bullseye one of the least likely scenarios. There's nothing to keep the low from going west except from well timed confluence from the low departing the martimes. There's no high pressure in a classic spot either.

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The best guess if we get an event next week is that it will go west and we will need to get front-ended.

 

Positives - 

 

-Air mass will be semi-stale but it is a monster air mass and high pressure will be in place within a day or less of the storm

-We're still in a good climo period when we don't need everything to be right to snow.

-we will have some semblance of a 50-50 low and we have a southeast trough.

- we have an epic EPO ridge and a +PNA

 

Negatives - 

 

- Awful +NAO

- Departing high with low pressure to our north and west

- Positively tilted progressive trough

 - Not a cohesive consolidated 500mb or surface reflection

 

I think the most likely top end scenario is a thump that mostly ends before we warm.  We can get 4"+ out of that scenario.  Downside is we shear or warm ahead of the precip or the frontrunning complex is wimpy.

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Well said Matt. My thoughts exactly. The whole time this threat has been on radar there has never been good hp to the north. That one fact alone is a good reason to not expect all snow if we get snow.

 

we just need to thump..this is a big SD air mass...chances are we'll be cold enough to be frozen at the beginning no matter what the scenario as long as we get precip in here in advance..we will need that.,..especially if it redevelops and we get dryslotted...

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The best guess if we get an event next week is that it will go west and we will need to get front-ended.

 

Positives - 

 

-Air mass will be semi-stale but it is a monster air mass and high pressure will be in place within a day or less of the storm

-We're still in a good climo period when we don't need everything to be right to snow.

-we will have some semblance of a 50-50 low and we have a southeast trough.

- we have an epic EPO ridge and a +PNA

 

Negatives - 

 

- Awful +NAO

- Departing high with low pressure to our north and west

- Positively tilted progressive trough

 - Not a cohesive consolidated 500mb or surface reflection

 

I think the most likely top end scenario is a thump that mostly ends before we warm.  We can get 4"+ out of that scenario.  Downside is we shear or warm ahead of the precip or the frontrunning complex is wimpy.

I agree, the ridge retrogrades enough the the low is likely to go to our north but the air mass is the coldest of the season so we could get front ended.  We need trough not to get too amped or the front end will end up in PA.  That's always a worry with these kinds of systems.  I think I'd rather we shear that really amp up.

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It is a fairly common way we get snow when we get snow.   Just not this year.   :(

Some snow maybe.. a lot of snow.. I dunno. I can't recall a lot of storms that were good front end thump then drizzle. A few. 

 

I still would be cautious about wanting a big storm.. it's way out there. It could be all rain still. 

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Some snow maybe.. a lot of snow.. I dunno. I can't recall a lot of storms that were good front end thump then drizzle. A few. 

 

I still would be cautious about wanting a big storm.. it's way out there. It could be all rain still. 

 

I am not seeing a big storm.  I think a reasonable top end scenario is front end, 4"+.  But that would be top end.  I think complete failure or something minor is just as or more likely.

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I am not seeing a big storm. I think a reasonable top end scenario is front end, 4"+. But that would be top end. I think complete failure or something minor is just as or more likely.

Right well big maybe wrong word. More along lines of Wes comment. We've chased a heftier thump via a stronger low before (recently) and ended up not having it work well but just shifting everything north. I'd probably root for the weak/south for now too just given our history of late and such. Then again we've been burned so much from this range it might not ecen look like what we see. We just can't know. ;)
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As you have said often, there is no "we" in this subforum. Front end thumps usually suck for east of I-95. Once in a while it works. N&W its a different story.

Exactly, that is why i never comment when Ian and Matt say that. With some of these storms its like we live in different worlds even though we are only 60 miles apart.
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It's going to take another 10" of snow to really change my opinion of this winter to neutral and 20" before I start liking it. Any car-topper to rain events will just make it worse. The fact that I even track them makes me wonder if this is an addiction rather than a hobby.

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I'm worried about everything on this one

Why though? You said it yourself there is nothing to keep this from cutting and we already went from pretty good on 12z to almost game over on 18z. Weaker and strung out we lose front end dump. Strong cuts west. Departing high and gl low. Hard to see a win scenario but lesser degrees of losing I guess. What kind of set up does the best ensemble member show I wonder.

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I'm worried about everything on this one

as long as the cold that is advertised shows up, I believe we have a decent shot at a mod. event (4" +/-)

I think the first warning sign of potential failure will be if the cold that is currently modeled  is noticeably weaker, but we won't know that until Sunday

if the cold is weaker, then it will almost certainly travel to our north and without deep cold, we'll be lucky to see an hour of snow on the front end

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as long as the cold that is advertised shows up, I believe we have a decent shot at a mod. event (4" +/-)

I think the first warning sign of potential failure will be if the cold that is currently modeled  is noticeably weaker, but we won't know that until Sunday

if the cold is weaker, then it will almost certainly travel to our north and without deep cold, we'll be lucky to see an hour of snow on the front end

Just a quick glance at some of the ensemble members gives one pause. The scenario of a west track is very real and the seasonal trend with the models is that the modeled cold air 7 days in advance is too deep. So figure on some temperature moderation and a west track and things don't look too good for the 4+ inches scenario. One would think a more wound up low would produce more QPF on the front end, but that also means more west which usually equals more warm air. Not feeling too good on this at the moment. There are scenarios where this could work, but has been mentioned many times, it's 7 days away. It WILL change. Fingers crossed for the better.

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