I was excited for a big threat mid Feb as well, and while it was a respectable storm (ended up with 7-8 inches) it didn’t quite pan out the way I originally thought with the big late Jan type phase. This setup is significantly better than that one.
What the late Feb threat has going for it that the mid month didnt is a significantly more poleward western ridge. The pattern was just a bit too progressive for a big phase mid month, but even so we saw that northern energy trend more aggressive like the pattern argued it would. With this threat similar to the last one, the ridge axis is over Idaho, which is slightly west of ideal but very good. It argues that a storm would have plenty of room to trend NW. The main difference is for this threat, we have the ridge out west extending to the north pole, where as the mid month threat only had it extending to NW Canada. This would support a more amplified pattern, giving the northern energy more room to strengthen and dig more SW, likely enough to tap gulf moisture. If this idea is correct, the northern stream would be able to do it on its own. There would be plenty of room for the trough to go negative early enough to bring the storm up the coast (Miller B cyclogenesis). With a northern vort digging that far SW and then strengthening rapidly as it taps gulf moisture, as the trough goes negative there is a decent chance we could see the upper low close off. In my opinion, this threat has a good chance at working out because are less at the mercy of timing since we wouldn’t really need a full phase with a strong piece of southern energy. If we get that it would up the ante even more, but it wouldn’t be necessary. I like this threat even more than I like the Friday storm. Friday is a legitimate threat and I like what I saw from the models tonight. However, it is more thread the needle for a bigger solution and even if everything goes right, the upside is capped somewhat compared to what the ceiling is with the Feb 28 threat.