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February 7th Storm Threat Discussion/Obs


mappy
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Just now, high risk said:

    Yeah, this morning's AFD from LWX is NOT aging well.....

This afternoon's mentioned the move north... and not much else really

.SHORT TERM /FRIDAY NIGHT THROUGH SATURDAY NIGHT/...
High pressure builds back in on Friday night on northwest flow,
allowing temps to drop back below freezing. Otherwise, mostly
dry, though a weak wave passing to the north could bring snow
showers to the Allegheny Front overnight into early Saturday.
Otherwise, high pressure will briefly dominate, with seasonable
temps. This no longer appears to last, as a sudden shift
northward with virtually all guidance now brings low pressure
northward Saturday night into Sunday, with increasing clouds and
increasing chance of precipition as we head towards morning.
Marginal boundary layer suggests a wet snow is most likely for
much of the area where precipitation begins by late Saturday
night, though given the model disparity, keep pops chance thru
the night. Lows mostly near freezing.

&&

.LONG TERM /SUNDAY THROUGH THURSDAY/...
There remains a lot of uncertainty for the forecast on Sunday.
Over the past few days, the weather models have been trending
south with a potential coastal low which had lead to a dry
forecast for Sunday. Over the past few runs, all models have
started to trend back further north. Generally, models are
forecasting a multiple low event with one low originating out in
the lower plains while a low forms down in the gulf and moves
toward the east coast. Previous solutions had these lows split
our region with one moving to the northwest and one to the
south. Recent trends have the lows phasing over the southern
Mid-Atlantic and parts of the Carolinas late Saturday into
Sunday. A general trend north and westward is slowly bringing
increasing chances for precipitation and snow on Sunday. The
lack of good high pressure placement to the north along with
warm temperatures leading up to the event may prevent a good low
level cold layer which would limit snow accumulations. Trends
over the next 24 hours will be critical especially since the
originating upper level wave is located over Alaska.

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It not only trended more amped but colder too!  So long as it doesn’t shift north more amped is good in a marginal temp setup. Of course it’s a tightrope because more amped can pump ridging in front and shift the boundary north. However, there is a window of opportunity here for both more amped but not north which the NAM just highlighted. That’s to get the wave to start to amp far enough east that it can’t pump too much ridging in front. It’s a thread the needle timing wise but it’s possible. 

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Just now, The Ole Bucket said:

This will definitely move even further north and result in rain/snow mix to all rain for CHO.

Bank it.

That's why you gotta savor the digital dopamine now. I agree that this becoming a NW storm is the most likely frustration here. That band of heavies is rather narrow. Kuchera below.

1612731600-L5VvWZ1JSWY.png

1612731600-WVkqox1KUgY.png

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I know this is stating the obvious, but I wouldn't completely mind a run (maybe 0z tonight) where things get shifted south, with subsequent runs correcting back northwards until gametime.

In any case, I love the "recovery" by the last few suites. None of the mood swings as with long-term tracking, and sll of the simple pleasure of having things pop in the shorter term.

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5 minutes ago, NorthArlington101 said:

I was kind of expecting the 3k to laugh in our faces but it looks like it's going towards a similar (probably slightly less extreme) result as the 12k.

Not sure about that, check out the 1hr snowfall rates lol. Also the 3k pushes the 850 boundary even farther north, honestly was looking like it was gonna get close to mixing, but not sure we could complain after 1-2"/hr rates for 3+ hours and then thumping sleet lol. 

 

PSU mentioned this in the 3-7 day chat but this feels similar to Feb 17 2018.. marginal temps surrounding the event and it looked super good for us at the day 3-4 range (but it jogged on North and we got lucky with good rates for a bit). Although all guidance considered we're probably in a good spot, still some misses to balance out the NW solutions

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1 minute ago, NorthArlington101 said:

I was kind of expecting the 3k to laugh in our faces but it looks like it's going towards a similar (probably slightly less extreme) result as the 12k.

1612677600-G0EjkTmOAa8.png

1612677600-Sjfp6VPFXa8.png

I would take a colder but slightly less juicy solution over playing the knife-edge game... which we always lose.

Although actually.. there was one win I can recall. December 9-10 2018. That was a tremendous storm for CHO.

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