A deep (open) longwave trough was present with the upper level jet axis positioned across the Mid Mississippi Valley region during the early morning hours of the 1st. At 500 millibars, the 1200 UTC analysis showed a near 100 knot jet axis stretching across the Tennessee Valley region with additional jet energy in the base of the trough across the Central Plains. Meanwhile, the 850 millibar analysis at 1200 UTC (on the 1st) showed very strong thermal and moisture advection with dewpoints in excess of +12 Celsius feeding from the Gulf of America northward well across the Deep South and Tennessee Valley. This resulted in a broken line of quasi-discrete storms that moved across the region from the late morning hours into the mid afternoon ahead of a slow moving cold front. Several storms exhibited supercellular characteristics with notable mid level rotation. These storms produced several instances of large hail across the TN Valley, along with damaging straight-line winds in a few locations.
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