A low pressure will be developing in the western Planes tomorrow, bring heat and humidity northward and strengthening the upper level winds, which will increase wind shear. Down in west TX, OK, and eastern NM, and SE CO a dry line will be the focal point of isolated storms tomorrow. Wind shear will be high enough so some severe storms, with tornadoes will be a threat along that dry line. Farther north, heat, humidity will be building all day, which will allow instability to also get high. Also, wind shear will be increasing in the western Planes. So, late tomorrow evening instability will be very high and things will likely explode in SE SD, eastern NB, western IA, and SW MN. Wind shear will also really be increasing tomorrow evening, so I believe that the areas mentioned above (the moderate risk zone) will see widespread storms developing by early evening tomorrow, with large hail, an enhanced damaging wind potential, and an enhanced tornado potential will exist with the storms, as wind shear will be high and instability will be very high. Late in the evening, the storms (which may be super cellular early in the evening) will likely organize into a complex of severe storms, or a Mesoscale Convective System (MCS). Once the storms organize into an MCS high winds will be the biggest threat along with flooding. The MCS will race east overnight, likely getting into Michigan by Friday morning.
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