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March 12 Rain to…more rain? Maybe some snow


HoarfrostHubb
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17 minutes ago, ineedsnow said:

Lol sharpest cut off ever moderate event here 5 to 10 miles away almost nothing

sn10_acc.us_ne-12.png

That's a pivotal issue with ptype and how they label the previous 3hr QPF as either rain or snow. That's why it's jagged contours right up through here and into Maine.

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3 minutes ago, dendrite said:

That's a pivotal issue with ptype and how they label the previous 3hr QPF as either rain or snow. That's why it's jagged contours right up through here and into Maine.

That's odd because GFS is available in 1 hour increments

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3 minutes ago, ineedsnow said:

Some of the sharpest cut offs I've  seen. Look at number 17.   5 minute drive from nothing to a snowstorm lol

 

 

GEFSNE_prec_snens_048.png

COD does this too. So if you're transitioning from RA to SN it'll overdo it on the snow on the NW edge of the time steps. If the model is tagging the ptype at 18hr to be snow, Pivotal is calling the QPF in that previous 3hr or 6hr interval to be snow when the truth is somewhere in that period it flipper from RA to SN.

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40 minutes ago, JC-CT said:

That's odd because GFS is available in 1 hour increments

Yeah...they should incorporate them into the algorithms even if they don't produce all of the maps at 1hr intervals. The depth is computed by the model so the positive depth change will be more smooth than the vendor clowns. You'll see here the precip is just starting to mix in central MA under those purple reflectivities. Pivotal is throwing 3-4" of snow there along the CT river. The positive depth change only indicates about 0.5".

edit…the first two maps in central Maine are an even better example.

prateptype_cat.us_ne.png

sn10_006h.us_ne.png

snodpc_acc.us_ne.png

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19 minutes ago, dendrite said:

Yeah...they should incorporate them into the algorithms even if they don't produce all of the maps at 1hr intervals. The depth is computed by the model so the positive depth change will be more smooth than the vendor clowns. You'll see here the precip is just starting to mix in central MA under those purple reflectivities. Pivotal is throwing 3-4" of snow there along the CT river. The positive depth change only indicates about 0.5".

prateptype_cat.us_ne.png

sn10_006h.us_ne.png

snodpc_acc.us_ne.png

One thing I learned from messing around with the raw files is that a lot of these contour maps are providing an auto-gradient between data points that actually implies level of precision that doesn't actually exist when you look at them using a block grid plot. Except for the hires like HRRR and 3km, of course, those models are extremely detailed. Really actually makes you appreciate that no, you aren't supposed use the 48hr HRRR for questioning the GFS's synoptics lol, but it absolutely provides a look at a resolution of detail that simply isn't possible with a 0.25 degree grid.

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3 minutes ago, joey2002 said:

Backed off a bit from the crazy 18z run, but still looks better than 12z for CT/MA marginal areas.

765877A3-52B6-49A5-86FF-4D2921B9250D.thumb.jpeg.57d890a8cc5ba39800f6406be6ef3075.jpeg

meh maybe a inch less but snows in the same areas looks like a nice advisory event   weathermodels is a tad higher then that map either way nice little storm

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5 minutes ago, CoastalWx said:

3K NAM looks reasonable to me. Kind of meh for many, but I think it highlights the areas to watch. Maybe a little too aggressive in some those spots for snow, but gives you the idea.

It’s real tenuous though so beware.

If it were to snow. What timeframe are we looking at? Like midday?

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