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Central PA Late January thread


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PotterCounty.... we have a cabin in shinglehouse, at the large iron bridge on the oswayo, ( spelling ) just before you get into town.

Are you right in shinglehouse or outside town?

Did DT have anything new to say, i see he hasn't posted anythig today

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Ensembles seem to be in decent agreement with the operational.

essential%21MSLP%21North%20America%2196%21pop%21od%21enfo%21plot_ensm_essential%212011012212%21%21chart.gif

essential!MSLP!North%20America!72!pop!od!enfo!plot_ensm_essential!2011012212!!chart.gif

12zecmwfens850mbTSLPUS072.gif

The reason I'm asking is that there is hardly a reflection across the Gulf then all a sudden there it is off the Delmarva. I know the 24 hour plots can be a bit misleading with such a time frame in between. That's usually where the SV plots come in handy but I don't have access.

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After making fun of the mets here who thought the GFS might have a slimmer of a chance in being right, he proceeded to explain why the 12z ECM didn't shift that much. Didn't really read his reasoning.

Had to go searching on f-book, he doesn't really offer up much reasoning really anyways. One of the commenters asked about central PA, he said 12z euro could possibly be correct with how it had the gradient but models like the UKMET buried CPA.

After doing some comparing on the 12z vs 0z Euro using accupro's model animator, it really isn't all that much different trackwise. Its largely the same until the point it gets up to the latitude where it starts to matter for us.. of course..from about Norfolk northward. Overall at face value the run is slightly more progressive and thus a bit further east. But the low on the 0z took a steeper trajectory straight up the coast, running from Norfolk thru the Delmarva to just south of LI. The 12z low, which starts a bit off shore of Norfolk, instead seems to be pressured a bit from an upstream shortwave near the Lakes and thus pressed out taking a much flatter track toward the benchmark. Its not a huge track difference but it makes a big difference wrt precip extent, especially since the 12z run was not as robust on the nw precip. Strength of the storm is very similar to 0z.

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Had to go searching on f-book, he doesn't really offer up much reasoning really anyways. One of the commenters asked about central PA, he said 12z euro could possibly be correct with how it had the gradient but models like the UKMET buried CPA.

After doing some comparing on the 12z vs 0z Euro using accupro's model animator, it really isn't all that much different trackwise. Its largely the same until the point it gets up to the latitude where it starts to matter for us.. of course..from about Norfolk northward. Overall at face value the run is slightly more progressive and thus a bit further east. But the low on the 0z took a steeper trajectory straight up the coast, running from Norfolk thru the Delmarva to just south of LI. The 12z low, which starts a bit off shore of Norfolk, instead seems to be pressured a bit from an upstream shortwave near the Lakes and thus pressed out taking a much flatter track toward the benchmark. Its not a huge track difference but it makes a big difference wrt precip extent, especially since the 12z run was not as robust on the nw precip. Strength of the storm is very similar to 0z.

Very interesting. Thanks for that observation. Assuming this is true, then the massive jump can very easily jump back since a minor change in the trajectory depicts a massive change with precip shield?

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Very interesting. Thanks for that observation. Assuming this is true, then the massive jump can very easily jump back since a minor change in the trajectory depicts a massive change with precip shield?

Well, its the combination of both those two things (track/extent) that I think makes the big change in precip. The 12z Euro wasn't as robust with precip extent as it had been (tighter gradient too), and since that has played out consistently with our coastals this season it might be something we have to deal with again. The euro could go back to more of the track it had at 0z and we could still see the tighter gradients. The Friday 0z run started destroying all of pa in 1-2+, last nights 0z run sported the tight gradient between JST and PIT with a similar track. It's going to be interesting to see how the models evolve the next couple days. it's still pretty early, don't be surprised if the Canadian say tonight backs towards the 12z Euro or worse while the GFS does its usual business again. It'd be nice if the models could spare the suspense and just lock in but you know thats not going to happen. :popcorn:

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