After damaging tornadoes, the National Weather Service conducts damage surveys to document the tornado track and produce EF-scale ratings based on damage indicators found during the survey. On Wednesday, NWS Des Moines released a preliminary survey track for the tornado that tracked from near Grimes to Zearing. The featured map combines this track along with its estimated start/end times and underlays the two tornado warnings covering this event. The track is discretized into one minute interval points with each point evaluated for lead time with the associated first overlapping warning. The map is attempting to illustrate the varying lead time somebody along this track may have experienced. There are many caveats to a map like this as somebody just outside of the first warning would still have likely experienced a heads up with a greater lead time that is shown by the plot. This tornado is currently rated as a EF-2. Additional damage surveys will come up over the coming days, including the most significant tornado directly hitting Greenfield. Here are links to NWS Des Moines, NWS Davenport, and NWS La Crosse event summary pages.

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