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Feb 1/2 Obs


nj2va

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I know some mets/knowledgeable people were talking about a transient block in the last few days. I'm guessing that's trending weaker? Just wondering what's causing this from a met. perspective.

It's a combination of hp nosing down and also into se canada being weaker and the clipper that bombs out moves out a little faster than the good runs. We lose confluence a little earlier and causes heights to be a little higher as the storm approaches. Less confluence + less hp + transient 50/50 moving a little faster = north track.

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6z from today on top and 12z yesterday on the bottom. Little things mean a lot. There was no reason to believe that things would go awry @ 12z yesterday because most guidance looked the same and the majority of ensembles agreed with the track. The nw track was never off the table though....obviously..lolgfs_mslpa_nhem_13.png

 

gfs_mslpa_nhem_16.png

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The GFS increased lows by 18 degrees at DCA between the 18z and 6z runs.

 

To be fair, record lows should have been an early indicator that the low tracking south was unlikely to stick around.  Moderate the temps to a reasonable level (low teens), and the preceding low has to come north, too.

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Through 6 hours the High moving toward the coast looks quite strong and the moisture is west across the desert. Not a good start.

On the ncep site, it looks like it initialized with yesterday's 12z data? Am I just not reading it right?

 

 

(time sensitive)

gfs_namer_000_850_temp_mslp_precip.gif

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To be fair, record lows should have been an early indicator that the low tracking south was unlikely to stick around.  Moderate the temps to a reasonable level (low teens), and the preceding low has to come north, too.

It was at least somewhat snow enhanced and probably a model error of some sort. We know the Euro has a cold surface bias in those types of situations and the GFS was even colder. The air mass is pretty legit otherwise if it is well placed. 

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