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January 3 CAPE Storm


WxUSAF
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4 hours ago, Maestrobjwa said:

Oof! Sharp cut off. Gonna bet Baltimore just misses warning level accumulation again...lol (unless we get another bump)

Yes. The cutoff is brutal. Especially for my area (Winchester). Literally 10 miles could be 4 inches or nothing. I would expect the precip shield to actually be a bit larger. Weenie logic only. 

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2 minutes ago, snowfan said:

Both NAMs picking up on todays souther trend.

What south trend? There is no south trend. The NAMs went a bit south. No other guidance is doing that. Other guidance continues to shift north. Could it change? Sure. But I'm confused how there is a south trend right now.

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2 minutes ago, jaydreb said:

What is FV3?  The NAM’s replacement?

FV3 has been chosen as the dynamical core for the Next Generation Global Prediction System project (NGGPS), designed to upgrade the current operational Global Forecast System (GFS) to run as a unified, fully-coupled system in NOAA’s Environmental Modeling System infrastructure. FV3 was successfully implemented within the GFS, and the FV3-based GFSv15 became operational on 12 June 2019. Other applications, such as regional high-resolution forecasting and coupled atmosphere-ocean modeling for seasonal prediction, are planned for later implementation at NCEP.

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One would have to think though that this couldn't trend N/W all the way to gametime. Models like HRRR at its latest run have pushed back S/E a bit. What I've been keying on all along for trend watching is the h5 presentation. A lot better than it was, but even on the 6z GFS you could see a little more press & influence from the presence of the N/S. If that area were to separate further and stay flat to the north, this would continue to press and allow negative tilt on our S/S wave. 

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1 hour ago, Bob Chill said:

Now that h5 is closed and/or aggressive on all models, time to have fun with pin the tail on the almost certain frontogen band on the NW periphery. Models right now have it SE of the fall line. Does that ever happen with h5 passes like this? Climo has been showing up in the model trends....

Eta: another perspective is parrs/climo favored areas are still dancing  in the subsidence zone... how often does that verify?

It can happen. I only got 2.5” from the Jan 2019 storm. There was a storm in Jan 1987 that gave DC a foot and fringed up here. Jan 2010 also was like that. The orographic banding and super high ratios you described is why there will typically be that “deathband” up here. The added terrain lift along with colder temps typically causes better snow growth conditions here. I often have 20-1 ratios. But those factors won’t happen if we’re in the subsidence zone and that can happen if the storm track is far enough south. Right now the track is iffy if there will be enough mid level moisture transport into this area. One more tick north like last night and we probably would see the typical orographic effects up here but there needs to be good enough moisture to take advantage of that.   

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