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Possible 3/20-3/21 Coastal Storm


Zelocita Weather

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NAM is only 2-3 inches. Weak stuff.

That's a lock NAM snowfall at 84 hours :snowing:  - otherwise - remember how useful the snow maps were for the Blizzard 3 plus days out in the middle of winter - many more variables to consider that would determine total snowfall in any given location during the last half of March 

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It's at least 36 hours too early for the NAM

If you want to use the NAM for something at this range, it argues an OTS solution. The trough is still positive at the end of the run, not a good sign for a model that's usually over amped.

namconus_z500_vort_us_29.png

Nam wasnt out to sea

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It's at least 36 hours too early for the NAM

If you want to use the NAM for something at this range, it argues an OTS solution. The trough is still positive at the end of the run, not a good sign for a model that's usually over amped.

namconus_z500_vort_us_29.png

This winter it hasn't been over amped for the most part on systems late in the period. I'm not sure what the reason is but its deviated from that bias often

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Not only is the trough still positive at that hour, but the energy dropping down the backside of the trough is to slow.

Every model at some point, even the Euro has shown a somewhat sloppy evolution to this system. The Euro hasn't for the last few runs but it was for a time before that

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Every model at some point, even the Euro has shown a somewhat sloppy evolution to this system. The Euro hasn't for the last few runs but it was for a time before that

If you factor in the model with the progressive bias, then this argues for a system right on the coast, but then again, it was the furthest NW with the most recent big miss, so who knows.

 

navgem_mslp_pcpn_us_17.png

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The 06z GEFS mean also took quite a significant shift SE from the 00z run. The fact that you have the Euro OP and EPS on board along with the UKMET increases confidence, but you have the GFS/GEFS/GGEM/NAVGEM/NAM all showing either an OTS or weak solution. This threat definitely isn't a slam dunk.

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