The warm side of the storm system on Tuesday prompted the issuance of a Tornado Watch that just clipped far eastern Iowa. The issued Tornado Warnings stayed just outside the state over Illinois. Iowa has not seen a Tornado Warning since late July as shown by the featured chart. Note that tornado warning counts do not equate to observed tornado counts as a number of tornadoes were reported during the 10 August Derecho. The left most plot displays the yearly accumulated number of warnings over the state based on unofficial IEM archives. Only one other year (1992) since 1986 is shown without a warning after 1 August. Of course, the year of 2020 is not over yet and the way things have gone, we'll see a tornado outbreak during December!

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Tags:   nws   tornado