Despite extreme instability, a strong capping inversion will limit thunderstorm development for most, if not all, of the day in northwest ND, eastern SK, and western MB.  However, if storms can initiate, they will likely be severe, producing very large hail and strong straight-line winds.  The region with the conditional severe wx threat today is shown in the red shaded area in the selected model forecasts shown here.  As seen below, the low-level jet is forecast to be relatively weak, with only around 20-25 knots at best along the instability axis at 850 mb.  This weakness should limit the tornado threat, if storms can break through the capping inversion.

As shown in the 12 hr accumulated precipitation forecast by the WRF model for 7:00 pm this evening, the storm coverage is predicted to be rather sparse, due to the strong capping inversion.  Still though, the WRF predicts storms will initiate in northwest North Dakota and southeast Saskatchewan by early evening.  I would not be surprised to see storms initiate further north between Saskatoon and the Manitoba Border as well, where slightly better wind shear exists.  Given the extreme instability, and ample deep-layer shear, these storms will likely be supercells, but with a rather limited tornado threat as mentioned.  Stay tuned for updates!