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March 11-12 Storm - Model Discussion STORM MODE


stormtracker

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1 minute ago, psuhoffman said:

The NS is diving in right on top of it. Pressing it down so the upper low gets too far south then swings out before any capture can happen. We would need that NS to be diving in way west of where it is or better get it the hell out of there all together. 

The GFS won’t show this solution I am confident.  

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2 minutes ago, psuhoffman said:

Which?  Pretty sure it's gonna continue it's trend towards a suppressed system for us that hooks in to clip New England. 

Neither. It will be something different. I just have a feeling.  I always look at at both and usually they are somewhat similar.  These are so different so close. Makes me think we still don’t have the final solution

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rgem misses, but it's a little better than 18z i think.  coastal is a little further west too.  i think the nam 3k is basically keeping that ull from drying out as it cross the apps.  the rgem does that and i'm assuming so are the others.  it's something to watch at least.

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Good trend on RGEM is lost at the final 12h interval when upper low goes too far south, but this kind of error can resolve in your favor in two different ways:

(a) the digging trend can intensify and pull in the northern stream, or

(b) the digging trend can continue to slow down and give time for coastal development to move north

No reason to toss yet. 

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Meanwhile LWX has increased their 10% chance totals to 7-9" for much of the metro. 

The 4"+ map shows 30% chance.

 

DISCO: 

SHORT TERM /SUNDAY NIGHT THROUGH MONDAY NIGHT/...
Low pressure over the Tennessee Valley will move northeastward
Sunday night. As it closes in on the Great Smokey Mountains
Sunday evening, it will send some energy to the East Coast that
will eventually and quickly intensify into a coastal low
pressure system on Monday. During the same time frame Sunday
evening, thickening clouds and some light rain and snow mix
will develop in our southwestern zones during the evening. As
the rain and snow mix transitions to all snow in the central
Shenandoah Valley and western Virginia Piedmont a few hours
before midnight, the light snow should spread a little farther
north into parts of the Northern Shenandoah Valley and northeast
Virginia. Snow accumulations are expected to be light further
north, while a few inches may be occurring to our south and
southwest. There is currently a Winter Storm Watch in effect for
Highland, Augusta, and Nelson Counties in Virginia starting at
11pm Sunday.

As the rain and snow mix or light snow slides or develops east
into eastern Virginia and toward southern Maryland late
Sunday night and Monday morning, the coastal low pressure will
begin its intensification. Some light snow accumulations may
occur as far north as central Maryland and the Mason-Dixon
region but given the potential storm track and model consensus,
snow amounts will be light...perhaps a few tenths of an inch on
average. Locations along and south of I-66 and U.S. 50 in
Virginia and over to southern Maryland would be the areas more
prone to encounter accumulating snowfall.

Overall, through Monday, computer models are not in good
agreement as to the track of the low pressure system, snow
accumulations and timing of precipitation arrival and ending.
Most snow accumulations across Maryland, eastern West Virginia
and northern Virginia should occur on grassy surfaces, while
snow accumulations in the Central Shenandoah Valley and western
Virginia Piedmont could be enough to covered roads and make them
slippery. Precipitation will end from west to east Monday
afternoon into Monday evening.

As the coastal low pressure system churns up the Eastern
Seaboard Monday night, high pressure will inch its way into the
region from the west and bring another round of chilly air
eastward. Some upslope snow showers expected in the Appalachians
Monday night.
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9 minutes ago, Interstate said:

It is all about the GL energy. We need it diving west... not east 

yea, and looking at the rgem IR you can see how that GL energy lags a little more on the 0z run vs 18z.  that might help to slow the ull and allow a better pass, which in turn could affect where the coastal sets up.  i'm generalizing, but it does seem like an important piece.

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