This is on a day with only modest mid-upper winds:
850 mb winds however, were around 30 knots:
This is a good case study of the importance of low level shear in tornado formation. A sounding was taken today at Lamont, OK at 17Z (noon CDT) today, which happens to be in Grant County. While there is little shear from 900 mb to 200 mb, the shear from the surface to 900 mb is significant, leading to an SRH value of over 300:
SPC mesoanalysis indicates less than 40 knots of 0-6 and 0-8 km shear, but well over 20 knots of 0-1 km shear:
When the thunderstorm cell moved into this area of increased low level shear, the tornado warning was issued. Helicity was also enhanced in this area:
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