I’d have to look up the specific examples but the April storms we got like 2003 and 2018 were southern sliders that went underneath our area, not big closed upper lows where we’re waiting for the primary to die off. That primary kills whatever marginal airmass we have anyway to start with, and also a huge dry slot. We need the whole upper low etc setup to depart well south of us, I’d say no further north than Ocean City MD/Cape May maybe. The CCB will set up north and eventually west of the upper low as it matures, that’s why maybe we’d get table scraps snow/white rain around the matured upper low. That’s what happened to us in the 4/1/97 storm-most of us got screwed because the upper low was too far north and it buried I-90.