Our current stretch of weather with daily scattered thunderstorms continued on Tuesday. These storms were a bit unique with a storm motion to the northwest. The featured chart displays a histogram of RADAR derived storm motion from the Des Moines NEXRAD. RADAR algorithms attempt to track storm cells and derive a storm motion (direction and speed). The top panel displays frequencies for period of record data archived by the IEM. The bottom panel displays this information just for storms on the 4th. So yesterday's storm motion was somewhat rare, but not as rare as a pure east to west motion.

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