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Central PA and the fringes - Feb. 2014 Part IV


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Something to note. Ec run is huge but what really makes it for our area vs the other globals is the ec fires up the deform band right over the 81 corridor then slides it east. It had a two parts kinda feel as the initial wave of waa precip weakens as it gets into pa but then we get a good .5-.75 thump from the back end. That is missing from the other models. If that is an error then it actually is not that out of line with the uk or cmc. They fire up the deform much further northeast too late for us. That's the key for us.

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Full on model war. 

 

Its definitely not going to make CTP's forecast decisions easy at all, thats for sure. GFS is supported by the GEFS having essentially a minor event for even the Sus Valley. The NAM has decent QPF but its confined to the LSV and southeast PA. And then we have the Euro with a full blown shield of precip covering 2/3s of PA.. which I expect will continue to be supported by it's ensembles as it has for a while now. The UKMET had a good shield over PA as well but it didn't seem impressive to me QPF wise. RGEM is running closer (just offshore) than the GGEM did tonight. 

 

I'll be interested to see the 03z SREFs and it they continue to at least look like the 21z run, which did ramp up with many more members showing precip back into the central compared to the 15z. 

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Something to note. Ec run is huge but what really makes it for our area vs the other globals is the ec fires up the deform band right over the 81 corridor then slides it east. It had a two parts kinda feel as the initial wave of waa precip weakens as it gets into pa but then we get a good .5-.75 thump from the back end. That is missing from the other models. If that is an error then it actually is not that out of line with the uk or cmc. They fire up the deform much further northeast too late for us. That's the key for us.

Could that be due to the Euro closing off the 500mb sooner then others due to how it handles the kicker differently?

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Mag you being a met, what do u think of the euro go with it since it has not moved run to run, also what about it qpf. I agree with a lot of people how do u have a low that strong with no precipitation. Thanks

 

There's been discussion in other threads about potential convective feedback issues with the models (specifically NAM/GFS) or possibly actual convective development that would inhibit the conveyor belt processes that set up the CCB. There's also the possible upstream influence of the Great Lakes low. I feel that the GL low has less of an influence than what may happen with the models convection wise out in the Atlantic , whether it ends up being real or imagined (model convective feedback). 

 

I will say that I personally think that the Euro just straight up has the most realistic looking precip shield given the features in play, with the ultimate track of the low up the coast dictating the positioning of it. You look at the GFS's positioning of the negatively tilted and closed off 500mb as well as the strength and positioning of its 850 low and you would think there'd be a significant swath of deform precip. 

 

I just can't wait to have this thing in striking distance and in RAP/HRRR range haha. 

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Serf took a tick east but still west of gfs/nam. Seems they are a compromise between the euro and anerican guidance. My guess is a mix of euro like runs and nam like ones. Not necessarily helpful to trying to pick sides. Also not helping is the fact that a compromise is unlikely. Either the low will ride the coastal front all the way up like the euro or it will follow the height falls caused by the convection to its east. Probably no in between. Ctp has a rough choice to make.

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Just went on a Sheetz run. -7ºF here and at the Bellwood Sheetz. Dipped down as low as -8ºF near my house. Gonna end up being the coldest night of the year I'm thinkin. 

dry air could take a long time to moisten the column. I am not liking that when it comes to the models and them not taking into the account virga.

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http://mag.ncep.noaa.gov/ImageFourPanel.php?model=nam&area=namer&cycle=06&fhr=030&param=500_vort_ht|1000_500_thick|700_rh_ht|850_temp_ht&size=medium

 

dry air? I am really concerned about this for PA. Rel Humidity and Precip fields don't add up on the NAM. Hopefully the column moisten ups or we see a whole lot of vigra before we get any to fall to the ground.

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http://mag.ncep.noaa.gov/ImageFourPanel.php?model=nam&area=namer&cycle=06&fhr=030&param=500_vort_ht|1000_500_thick|700_rh_ht|850_temp_ht&size=medium

dry air? I am really concerned about this for PA. Rel Humidity and Precip fields don't add up on the NAM. Hopefully the column moisten ups or we see a whole lot of vigra before we get any to fall to the ground.

This is an stj system loaded with moisture and the flow is backing plenty ahead of it. The atmosphere in 24 hours will be nothing like it is now. I wouldn't worry too much.
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