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Feb 9: Iggles flying, weenies high-fivin’: the kickoff to a great stretch


mahk_webstah
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Don’t be intimidated by our terrible luck lately.  Dont be discouraged by endless model teasing.  It’s coming.

you can be like Saquon, sprinting through the snow and slapping your head.

both the 6th and the 9th have been on the models for a long time and the progression seems clear. The 6th has some issues with warm air, but the 9th is decidedly colder. And these arent clippers. We are getting into actual storms. Here’s a little clip from the WPC:

Meanwhile farther east, precipitation is likely in association
with a low pressure system located over the Great Lakes by early
Thursday. Rain is forecast across the Tennessee Valley to
southern/central Appalachians, but rain totals are forecast to
decrease by Thursday (compared to Wednesday) and likely stay below
thresholds for any excessive rainfall area on Day 4. Will continue
to monitor though as instability may still be in place for some
locally heavy rain rates. Farther north, cold air in place will
bring the potential for wintry weather to the Northeast.
Probabilities for plowable snow/sleet are increasing across the
Adirondacks into northern New England, while south of the greatest
snow amounts, a transition zone of sleet and/or freezing rain is
likely perhaps around the northern Mid-Atlantic to southern New
York/New England. By Friday-Saturday some light to moderate snow is
forecast for the northern tier, but as a low pressure system
organizes over the weekend, increasing precipitation will spread to
the east-central and eastern U.S. again. The current forecast has
the greatest probabilities for impactful snow across much of
Pennsylvania and New York into New England during the weekend. 
 

and their pretty map:

image.gif.cad895ba03f056752382ca3e84862769.gif

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  • mahk_webstah changed the title to Feb 9: Iggles flying, weenies high-fivin’: the kickoff to a great stretch

This event - to me - looks like it has the same circumstance of uncertainty at this range, that plagued ( and still does...) this D6 system in the foreground.  It's evolving along a compressed/very fast flow.  Excessive needle threading requires precision that's going to be hard to come by at a D5 or 6 lead...  

For now, the tracks seem to be N of the triple point lat/lon nexus we see for the 6th.  All guidance I've seen from 00z have a low up NW of ALB, But like the 6th, the speed of the approaching wave/storm mechanics is so fast it outpaces the lower tropospheric ability to modulate/"scour out" the cold.  This leads to the IB pulse snows that then go to pellets S and perhaps staying S N - circumstantially, this latter obviously favoring central and NNE if the track stays - not sure we can count on that, however.  

There seems to be a bit of hint to more secondary in the EPS and GEFs..which may be an indicator for a future correction but that's purely supposition for now.

 

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7 minutes ago, Typhoon Tip said:

This event - to me - looks like it has the same circumstance of uncertainty at this range, that plagued ( and still does...) this D6 system in the foreground.  It's evolving along a compressed/very fast flow.  Excessive needle threading requires precision that's going to be hard to come by at a D5 or 6 lead...  

For now, the tracks seem to be N of the triple point lat/lon nexus we see for the 6th.  All guidance I've seen from 00z have a low up NW of ALB, But like the 6th, the speed of the approaching wave/storm mechanics is so fast it outpaces the lower tropospheric ability to modulate/"scour out" the cold.  This leads to the IB pulse snows that then go to pellets S and perhaps staying S N - circumstantially, this latter obviously favoring central and NNE if the track stays - not sure we can count on that, however.  

There seems to be a bit of hint to more secondary in the EPS and GEFs..which may be an indicator for a future correction but that's purely supposition for now.

 

The correction vectors seem to be pointing in the right direction on this one. That’s why I’m so optimistic. In the end, I suspect this gets most of southern New England with at least a few inches and a crust. You have to assume there’s gonna be an all-encompassing storm for the whole region and probably other regions. But not this one. The intangibles are leaning our way this time around.

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2 minutes ago, Damage In Tolland said:

Which is 96% HREF based 

Only 96% off if you want to be literal, but there are things that go into the HREF that are part of their super ensemble.

For reference, inside 3 days you get the Euro op and 25 ensemble members, the GFS op, GEFS mean, and 10 GEFS members, 10 GEPS members, a SREF mean, and then some combination of the HRRR, NAM, FV3, NMMB, ARW as available.

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18 minutes ago, OceanStWx said:

Only 96% off if you want to be literal, but there are things that go into the HREF that are part of their super ensemble.

For reference, inside 3 days you get the Euro op and 25 ensemble members, the GFS op, GEFS mean, and 10 GEFS members, 10 GEPS members, a SREF mean, and then some combination of the HRRR, NAM, FV3, NMMB, ARW as available.

Preachin n teachin

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The Euro's 12z, 120 hour layout is right out of a mid March winter storm set up... 

HUGE  thickness dipole across the eastward extension of the polar boundary - March's and even latter February's this gets to be interesting.  Here we are signaling why storms at that time of year can once in a while, massively over-achieve.

image.png.88a0ba581fdb97eb77da4c1e118be061.png

The only limitation to this one is likely to be the attending S/W is probably being attenuated for moving through a very compressed field, otherwise, in principle, that could be a very dangerous set up.  As is, it probably means that it would likely over produce where ever it is precipitating as the storm formulates through that gradient pathway -

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Euro has been waffling back and forth a bit on this threat. 12z run made the primary more zonked again so not much snow at all for CT/RI…and maybe only a couple of inches this solution for the pike region. But if you back off just slightly on that primary intrusion, then you could easily go 4-8” too. Details to be ironed out. 

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