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Model discussion thread


ORH_wxman

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Obviously, no one should take individual ensemble members at days 5-10 as verbatim solutions.

But, the 12z OP said, this is how you do cold and dry. The 12z GEFS said yeah good luck with that.

The op is the new GFS now and I have not been impressed with it in the long range. The operational runs are bad enough after day 10, but I've noticed several runs over the past week where it was way too progressive with the EPAC ridging and flooding the conus with pacific air. That's probably not going to happen.
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Euro grazes the Cape with the clipper, but a nice event at the end of the run. You can see the timing of features is all over the place on the models, but I think the takeaway is that they are showing some storms.

 

The OP model worshippers will remove the nooses for a run.

 

The clipper did look a bit healthier this run, though it still has some work to do.

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The OP model worshippers will remove the nooses for a run.

 

The clipper did look a bit healthier this run, though it still has some work to do.

I'm not following any threat until it reaches 72 hours.

I've had enough of it...not complaining....quite to the contrary; this MO is to ensure that I don't.

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I'm not following any threat until it reaches 72 hours.

I've had enough of it...not complaining....quite to the contrary; this MO is to ensure that I don't.

 

 

Given the lack of downstream blocking, we're not going to have a ton of stability in individual storm threats until about 72-84 hours anyway. It's a good rule of thumb.

 

Those well-blocked, slower flow patterns can be predicted a bit easier (think 1/12/11 HECS from 5 days out...almost didn't budge with that block in Greenland...or 2/6/10 HECS that we smoked cirrus in...that damn line didn't make it north of NYC for like 144 hours straight save a few bad GFS runs)....but the less blocked patterns can "wiggle" around a bit more.

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Given the lack of downstream blocking, we're not going to have a ton of stability in individual storm threats until about 72-84 hours anyway. It's a good rule of thumb.

 

Those well-blocked, slower flow patterns can be predicted a bit easier (think 1/12/11 HECS from 5 days out...almost didn't budge with that block in Greenland...or 2/6/10 HECS that we smoked cirrus in...that damn line didn't make it north of NYC for like 144 hours straight save a few bad GFS runs)....but the less blocked patterns can "wiggle" around a bit more.

 

Sandy may have been the best example of that. 

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Given the lack of downstream blocking, we're not going to have a ton of stability in individual storm threats until about 72-84 hours anyway. It's a good rule of thumb.

 

Those well-blocked, slower flow patterns can be predicted a bit easier (think 1/12/11 HECS from 5 days out...almost didn't budge with that block in Greenland...or 2/6/10 HECS that we smoked cirrus in...that damn line didn't make it north of NYC for like 144 hours straight save a few bad GFS runs)....but the less blocked patterns can "wiggle" around a bit more.

 

You just can't hammer that point home enough to some

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Euro Ensembles??  Looking Good like yesterday?  Bad?  ?  

 

Not fully out yet, out to about 288 hours...but they look good. They are bullish on a system for 1/24-25 and then show hints for 1/27. The 1/24-25 system though is a pretty strong signal...but who knows where it actually tracks. It could be a cutter, so don't say we didn't warn about that.

 

But at least the ancedent airmass is pretty cold for that, so there's a bit of wiggle room.

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The NAM likes to nuke-up coastal lows...but just because it is not west, doesn't mean the Euro can be tossed. I agree the Euro solution is an outlier...but keep in mind the NAM can be strung out too. In the Feb 2013 blizzard, it had no snow for SNE like 72 hours out...it was a whiff out to sea on an ugly strung out wave. It finally corrected west as we closed in on 2 days out.

 

I mostly just exclude the NAM beyond 60 hours at all.

 

Me too other than entertainment - 

 

Btw folks, there is multi agency support for falling NAO index values, and this may also be driven by a falling AO that makes perhaps -1 SD, and the fact that the NAO and AO share domain -- such that the AO is effecting the NAO's drop.

 

Also, this event was signaled longer than we've been talking about it. It's got Archembault written all over it -- unfortunately for the snow geese, those events don't say anything about ptype, or even storm type.  

 

Be that as it may, I mentioned this myself last week that this trough could easily become more amplified in future runs and days, with the positive PNA rise and in place.  

 

We'll see how it plays ... but negative tilt system and huge dynamics muddles things a bit, and should expect the unexpected. 

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The clipper never had a chance Jimmy. Shear city

 

The clipper is making a comeback for the very reason the coastal areas have been burned on these marginal events all winter...the underestimating of the NATL ridge...notice on the ensembles and models which now show the clipper the flow goes WSW from the Oh Valley to the Maritimes behind the MLK storm..its not potent WSW flow by any means but its enough and its a product of that ridge in the WATL...as a result...the flow is less WNW-ESE and more WSW-ENE across the Eastern US and the clipper encounters less shearing and confluence...you can even argue it encounters flow somewhat favorable for it to deepen a bit on the Op Euro and some ensembles.

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