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Central PA Fall Thread II


JamieOber

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LATEST MDL SOUNDINGS SUGGEST THE LIKELIHOOD OF A CHANGEOVER TO SNOW ACROSS THE N MTNS WED AFTN WITH A LIGHT ACCUM QUITE POSSIBLE. FURTHER SOUTH...LOOKS LIKE THE PCPN WILL MOVE OUT BEFORE THE COLD AIR MOVES IN LATE THU.

Hmm. CTP doesn't seem too optimistic. I was never keen on the snow potential for this Thursday afternoon either, but the trends today have been in a great direction. I'm not convinced just yet, but it's not out the question that we could get the grass covered Thursday afternoon/night, even here in State College.

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00z GFS is a big step in the right direction for storm number 2 (and for storm number one, interestingly enough). However, we still need another couple major shifts like that to put us in the Euro's sweet spot.

Euro's been inching flatter and East.

Usually we see them meet in the middle...which would cancel the heavy qpf output for CPA.

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Hmm. CTP doesn't seem too optimistic. I was never keen on the snow potential for this Thursday afternoon either, but the trends today have been in a great direction. I'm not convinced just yet, but it's not out the question that we could get the grass covered Thursday afternoon/night, even here in State College.

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Yea these are some great probs on the SREFs and would signifiy quite a nice snowfall (perhaps a 2-4 max in the north) considering the time of the year. Might have to concoct some kind of a snowmap tomorrow for this.

As for the second storm, I said yesterday the jury is likely to remain out on this model-wise for a few more days. As such, I remain noncommittal on whether this happens or not. With that said, the setup presents a rare oppurtunity for this early with this possible coastal low following right in the heels of this first event putting enough cold air (albeit marginal) in place for things to get white if this storm goes down. The Euro apparently did have some support today in the form of the 12z JMA which came on board with an eastern seaboard slamming coastal low...for what thats worth. New 0z GFS coming in is actually a bit closer, but wide right still for us. I'd be a little more shy on this storm potential if I hadn't already seen it snow at the beginning of October . But this year has liked to do stupid crazy things, so I wouldn't write this off yet even if the Euro dropped it later tonight.

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After putting off some homework and looking at the storm situation most of the day, it looks like the fate of our weekend potential lies in the interaction between the southern shortwave and the northern branch wave which is west of the long(er) wave trough currently in the west.

In order for a storm to effect people in this region, the southern storm must remain separate from this large trough and remain its own entity. This will allow it to interact with the northern wave and phase. If the northern branch is strong enough and the southern branch stays its own entity, a solution similar to the EURO's past runs seems in the realm of possibility. I think the reason that the EURO was showing the only snowy solution is its known SW bias which left the southern feature further west than all the other models.

I have seen that both the NAM and GFS have been separating the Southern feature more each run. Keep watching that today.

06z GFS today (disregard my time stamp, I realized I mixed them up):

post-1406-0-04430100-1319640395.jpg

12z GFS yesterday:

post-1406-0-08124700-1319640363.jpg

Hopefully this is informative (and correct)! I'm not a forecaster. More on the climate research side of things :whistle:

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Looking at the Wunderground plots, Euro was actually significantly further West.

Kind of nice that the deamplification trend stopped so soon.

The SREFs are starting to pick up on the coastal storm some now that it's starting to get solidly in their range. There were a few members in the 15z with some feisty coastal lows and there were some minimal 1+ snow probs that popped up. Only one member hit us solidly, so thats obviously still a work in progress. Does seem that models overall are starting to consolidate on a coastal low forming relatively close to the coast. The Euro gave the southeastern quarter of PA some light-moderate precip, the JMA is close to what it had yesterday keeping central PA involved. Part of me still wonders if Rina or whatever ends up being left of it has an influence on the development/track of this system.

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The SREFs are starting to pick up on the coastal storm some now that it's starting to get solidly in their range. There were a few members in the 15z with some feisty coastal lows and there were some minimal 1+ snow probs that popped up. Only one member hit us solidly, so thats obviously still a work in progress. Does seem that models overall are starting to consolidate on a coastal low forming relatively close to the coast. The Euro gave the southeastern quarter of PA some light-moderate precip, the JMA is close to what it had yesterday keeping central PA involved. Part of me still wonders if Rina or whatever ends up being left of it has an influence on the development/track of this system.

I see a lot of people pondering this.

If tropical systems are at the mercy of the flow around them, I don't see how they can have an influence on the development of the a mid latitude system...unless the mid latitude system is developing off the circulation of the tropical cyclone?

Or am I thinking wrong?

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I see a lot of people pondering this.

If tropical systems are at the mercy of the flow around them, I don't see how they can have an influence on the development of the a mid latitude system...unless the mid latitude system is developing off the circulation of the tropical cyclone?

Or am I thinking wrong?

Tropical systems can sometimes merge with mid latitude cyclones and they can also influence them without necessarily merging. A tropical system that gets drawn up north is bringing alot of heat and moisture with it. And that can build up ridging and make for a more amplified pattern. This sort of setup occurred in late October 2005 with Hurricane Wilma and aided a major east coast storm and early snow event for central PA, especially in the higher elevations. Rina doesn't appear that it is going to be pulled up out of the southern Gulf but instead eventually sheared apart and mainly left behind lingering in that area..with some of the computer models even turning whats left of it back south. Some models like the GFS had been off and on playing with the idea of bringing Rina over Florida which could provide at least an additional moisture source for any coastal development. Right now though it appears RIna should stay mainly separated from whatever ends up happening with the coastal.

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Any met want to throw a map together for snowfall for the first wave? I think some places can see 1-3" still.

Not being altogether too familiar with the area I'm not really ready to throw a map up yet, but the 00z NAM agrees with some of the more recent GFS/NAM runs in keeping plenty of moisture around after the 0C 850mb line moves through, so I would think 1-3" above 2,000' seems pretty reasonable. Maybe up to an inch here in State College, and possibly even a dusting as far south and as low as Harrisburg.

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