IEM Daily Feature
Tuesday, 20 September 2016

Not late for Tornado Watch

Posted: 20 Sep 2016 05:41 AM

A Tornado Watch was issued yesterday for portions of eastern Iowa. Thankfully the tornado threat never materialized and the severe storms were isolated. How often do we see a tornado watch issued in September or later? The featured chart displays the period between the first and last tornado watch issued by NWS Des Moines each year. The anomalous drought year of 2012 skews the numbers a bit, but a majority of years plotted have had watches this late in the season, We are in an active pattern this week, so more severe weather is possible.

Good = 9
Bad = 0
Abstain = 1