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January Storm Term Threat Discussions (Day 3 - Day 7)


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8 minutes ago, psuhoffman said:

This is the main difference I see with gfs. That feature is much weaker and not affecting the flow as much on the gfs 

0C62714A-C4B2-46EC-9E1D-9A5CE8B45A1A.thumb.jpeg.969b5b7d53626f22322e833b4839d182.jpeg

ETA: that feature washes out in future frames and isn’t much of an impact down the line. 

That is the ULL from the first storm and it did not treat our high kindly.

 

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image.thumb.png.b2377e449085aaeae5f0a6b020bc1d36.pngIt is pretty good step towards the GFS.  Below is a comparison of 00Z 500h and the 12Z.  Note how much more ridging takes place ahead of the vort and associated trof and what has happened over Maine.  The latter has relaxed allowing more room for our approaching trough.  If it relaxes a tad more we might get development a little farther west and more precipitation.  There is that pesky impulse ahead of the trof,  if it were to minor out quicker that would also help. 

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Just now, usedtobe said:

image.thumb.png.b2377e449085aaeae5f0a6b020bc1d36.pngIt is pretty good step towards the GFS.  Below is a comparison of 00Z 500h and the 12Z.  Note how much more ridging takes place ahead of the vort and associated trof and what has happened over Maine.  The latter has relaxed allowing more room for our approaching trough.  If it relaxes a tad more we might get development a little farther west and more precipitation.  There is that pesky impulse ahead of the trof,  if it were to minor out quicker that would also help. 

This is the post i was waiting for.   It’s gonna snow y’all. 

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1 hour ago, Weather Will said:

WB Can snow maps 12Z v 0z, again going wrong direction.

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If this adjust back south I wouldn't be surprised, but if it also did its usual NW jog inside 72 that wouldn't surprise me either. I think this whole setup is mainly predicated off of what strength and timing of confluence we'll have as the SW digs. Too much confluence and track is south but temp layers are better. Too little and we get ptype issues. Very tedious setup

43 minutes ago, MN Transplant said:

I know I’m late to this as we wait in the euro, but  that precip shield, that wind direction, that low location, the date, and then you drop that it is 37/36 at DCA.  Unreal.

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I was thinking the same exact thing today. I guess its a combo of warming background state and the main driver this season (Nina) leading to PAC air intrusion to our cold source. That's my simpleton guess I suppose

11 minutes ago, psuhoffman said:

The h5 track is perfect. And i would say it got half way to what we need wrt amplitude to get a nice snow event from this.  The h5 dives from Chicago through Ohio and across VA it just doesn’t close off in time for us. 
ACC5FBBA-5047-44B1-93A1-2EFD420D4912.gif.054851e011ec4246b71ef9606e877b66.gif

Doesn't that H5 track seem a little flat to you? I would think we'd want the base of that trough rounding a little quicker and titling negative a little earlier to allow for dynamics to take over given our moderate airmass. I know its a tight rope -- if it tilts negative too quickly we have track issues. But I feel like we need excellent dynamics to deal with our ptype issues. I fear if this is not geared up we all fail, vs. rain to dynamic rates with good back side ccb.

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3 minutes ago, PivotPoint said:

 

 

If this adjust back south I wouldn't be surprised, but if it also did its usual NW jog inside 72 that wouldn't surprise me either. I think this whole setup is mainly predicated off of what strength and timing of confluence we'll have as the SW digs. Too much confluence and track is south but temp layers are better. Too little and we get ptype issues. Very tedious setup

I was thinking the same exact thing today. I guess its a combo of warming background state and the main driver this season (Nina) leading to PAC air intrusion to our cold source. That's my simpleton guess I suppose

Doesn't that H5 track seem a little flat to you? I would think we'd want the base of that trough rounding a little quicker and titling negative a little earlier to allow for dynamics to take over given our moderate airmass. I know its a tight rope -- if it tilts negative too quickly we have track issues. But I feel like we need excellent dynamics to deal with our ptype issues. I fear if this is not geared up we all fail, vs. rain to dynamic rates with good back side ccb.

Yes but compare it to previous runs it was getting there. I don’t think there is much chance it goes negative given the flow in the Atlantic but we need it to close off sooner. It happens a little too late this run but way way closer. 

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3 minutes ago, psuhoffman said:

Yes but compare it to previous runs it was getting there. I don’t think there is much chance it goes negative given the flow in the Atlantic but we need it to close off sooner. It happens a little too late this run but way way closer. 

Hard not to be happy with that run. Way better than 00Z and trending the right way.

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