I had been "way out" on this event, but the 12z NAM3 is making me reconsider, with some impressive signatures much further north than in previous runs along with greater instability and a shear profile that is lacking in low-level shear but would have decent deep-layer shear with a modest increase in sfc winds. This solution is an outlier for now, but I'll be curious to see whether the HRRR trends in its direction.