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Dec 16-20 Snow/Mix events - Going over like a fart in church


HoarfrostHubb

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This is a big difference in 6 hrs,

The GFS is in its "what storm" range? ... the 6Z run was laughable, I hot potato-ed that b*tch all the way to Tolland (where the Rev chucked it into orbit)...

Seriously, this evolution is reminding me a bit of the model runup to Boxing Day... features are slightly different and the atmosphere is colder but I do think the stronger solutions will win the day at the end.

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2nd one is now mostly a miss so we are still looking at 5 days lead on the "big" one

Main low is offshore due to the late phase, however, due to the nature of the downstream orientation, there is definitely an inverted trough signal being depicted up on the GFS.

While its not a sub 990 bomb, its still something

This is something to watch for sure

gfs500mb-hgt_rvort_144.png?1355415329

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He means the GFS is useless with regard to surface temps for the interior in cold drainage situations.

Think ice.

It simply does not have the best grid to handle CAD...even the NAM can have issues. Models in general will struggle with these CAD situations. They don't hit the idea that a coastal front can separate temps of 40F to 28F in like 4 miles. The grid resolution will never show that too well, and it always has a bad handle on the lower 1500' temps in these situations.

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It simply does not have the best grid to handle CAD...even the NAM can have issues. Models in general will struggle with these CAD situations. They don't hit the idea that a coastal front can separate temps of 40F to 28F in like 4 miles. The grid resolution will never show that too well, and it always has a bad handle on the lower 1500' temps in these situations.

CF is prob near 495 in this...maybe N Billerica....

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Nam already is. We'll see what Euro does, but you gotta figure things can only trend a bit colder as we get closer as models sense cold high and weak low s of coast

NAM actually warms me above freezing eventually too. But even the NAM won't see the CAD better until closer in...it was pretty bad in the Dec 1st event.

At this point, we don't know that there will be icing, but we can definitely say the threat is there looking at the synoptic setup on both the NAM and GFS. High in Quebec and sfc reflection getting squashed underneath SNE is out of the Icing 101 handbook for us.

The magnitude of the cold shot preceding though is very important. We want to lay down some solid dry arctic air....then advect it southwest as well from Maine. This event could still go alternate routes. Its not that far from being a lot of snow...especially for areas like where Ray is in NE MA.

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NAM actually warms me above freezing eventually too. But even the NAM won't see the CAD better until closer in...it was pretty bad in the Dec 1st event.

At this point, we don't know that there will be icing, but we can definitely say the threat is there looking at the synoptic setup on both the NAM and GFS. High in Quebec and sfc reflection getting squashed underneath SNE is out of the Icing 101 handbook for us.

The magnitude of the cold shot preceding though is very important. We want to lay down some solid dry arctic air....then advect it southwest as well from Maine. This event could still go alternate routes. Its not that far from being a lot of snow...especially for areas like where Ray is in NE MA.

And the NAM also had major timing issues Dec 1... 20 hours off or so?

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NAM actually warms me above freezing eventually too. But even the NAM won't see the CAD better until closer in...it was pretty bad in the Dec 1st event.

At this point, we don't know that there will be icing, but we can definitely say the threat is there looking at the synoptic setup on both the NAM and GFS. High in Quebec and sfc reflection getting squashed underneath SNE is out of the Icing 101 handbook for us.

The magnitude of the cold shot preceding though is very important. We want to lay down some solid dry arctic air....then advect it southwest as well from Maine. This event could still go alternate routes. Its not that far from being a lot of snow...especially for areas like where Ray is in NE MA.

yep. you need that cold start and continued steady drain. that's why, barring this airmass dropping further south and west initially and ending up colder, i'd favor your area and points NE for ice. i could see other areas going to some light ice but not holding it very long.

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SE bias? LOL

Probably.

last night's euro showed a late blooming system and this continues that idea. if today's run is similar i'd start getting a little nervous

It's okay for some as the extension gets going in PA/NJ etc, then a lull, then we wait for the precip to back down over eastern/central New England. Not bad here for us.

post-3232-0-56576400-1355416046_thumb.gi

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