A pesky upper level low pressure system has been causing interesting weather these past few days. On Thursday, NWS Des Moines issued a number of Tornado Warnings for storms that were moving toward the northwest. Storms that move in that direction rarely get Tornado Warnings over Iowa. The featured chart displays a scatter plot and kernel density estimate for NWS Des Moines issued Tornado Warnings that include an analyzed storm motion. The red dots are from Wednesday's event and there is very little company for storms that have some westward moving component. The setup for storms moving in that direction to produce tornadoes is very rare in this part of the country. The chart shows the dominate storm motion of about 30 MPH from the WSW.

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Tags:   time...mot...loc   warnings   nws