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Friday, January 21st Storm Discussion II


Baroclinic Zone

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All the changes thus far have been a product of the northern stream digging more, which allows the surface low to start deepening further southwest and is thus stronger at our latitude. Problem is, without a clean phase, we get diffuse differential vorticity advection, uniformly lowering pressures across a wide area, and the surface low is therefore not getting any more intense with each model run (i.e. the low level vorticity is remaining about the same). In addition, this is why we aren't getting a low closing off at 700mb -- heights are being more dependent on temperature advection rather than DVA.

So really a simply NW trend (and nothing else) continuing today wouldn't yield much more QPF than is advertised currently, and would just result in some mixing issues.

Obviously excellent movements thus far in the model runs, that were to some extent anticipated (kudos Will and Kev).. Just saying what we might like to see to make things even more interesting.

I think you are right in that a trend nw won't help aid in qpf. The trend will be to see of we can get a stronger vortmax to help kick off cyclogenesis on the coast of NJ. If that happens, then all the feedback processes will help with qpf. That said, even with an open wave at 700mb...soundings try to show an area of moist adiabatic ascent that could easily support heavier bands due to enhanced lift. 850mb tries to close off over se mass too.

post-33-0-51080600-1295540773.png

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I think you are right in that a trend nw won't help aid in qpf. The trend will be to see of we can get a stronger vortmax to help kick off cyclogenesis on the coast of NJ. If that happens, then all the feedback processes will help with qpf. That said, even with an open wave at 700mb...soundings try to show an area of moist adiabatic ascent that could easily support heavier bands due to enhanced lift. 850mb tries to close off over se mass too.

post-33-0-51080600-1295540773.png

Good post, Scooter. Right now we need to see mid levels start to jumpstart a bit faster to help organize thing a bit better.

I'd say 4"-8" looks good for most of us... probably a bit more up near Ray.

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All the changes thus far have been a product of the northern stream digging more, which allows the surface low to start deepening further southwest and is thus stronger at our latitude. Problem is, without a clean phase, we get diffuse differential vorticity advection, uniformly lowering pressures across a wide area, and the surface low is therefore not getting any more intense with each model run (i.e. the low level vorticity is remaining about the same). In addition, this is why we aren't getting a low closing off at 700mb -- heights are being more dependent on temperature advection rather than DVA.

So really a simply NW trend (and nothing else) continuing today wouldn't yield much more QPF than is advertised currently, and would just result in some mixing issues.

Obviously excellent movements thus far in the model runs, that were to some extent anticipated (kudos Will and Kev).. Just saying what we might like to see to make things even more interesting.

Agreed 100% as usual.

looking at the Bufkit for KPVD had preety low ratios with some freezing rain. whats the deal with that ratios under 10:1 majority of the time. :thumbsdown:

It's a little early for the MM5 based on earlier storms but it keeps the frozen line to about the canal and then crashes it SE. It's really nailed highlighting potential mix issues the last few systems particularly inside of 12-18 hours (tonight). It drops the most QPF right on the other side of the changeover line. Are we riding meso scale this time or sticking with the NAM

pcp3.27.0000.gif

pcp3.30.0000.gif

boci.27.0000.gif

If I were to lock in all solutions @ 48 hours out this year, My area would be approaching 60"+.

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Not more than 2 hrs ago you posted 2-4 for most of us lol...Flip flop

lol i hadn't really looked at anything this morning... but 12z models definitely more impressive.

It's one of those winters where everything overperforms. This is your kind of winter to get forecasts right!

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Not more than 2 hrs ago you posted 2-4 for most of us lol...Flip flop

It was a tough forecast yesterday. No way would I have gone 6-12 for BOS..or even 5-10". Even if you have the seasonal trend in mind..you can hedge a little heavier, but it becomes borderline irresponsible if I went 6-12 for KBOS..given the data I had. We can talk about it all we want on the boards, but you just caused everything to go code red if you forecast 6-12".

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