The St. Patricks Day 2016 Sun Prarie Tornado was a Rare Anticyclonic EF2 tornado that caused unexpectedly impacted Sun Prarie, Wisconsin on March 17th, 2016.
it had been a quiet start to the Week for Meteorologists, barely any storms were active across the US, and those that were active, only a few barely became severe in Oregon and Washington States, but no tornadoes were reported from them.
Until About 11:45 AM on St. Patricks Day, When Local Meteorologists began to monitor a new area of Weak Severe Storms moving North-West from Chicago, Illinois.
And about half an hour or so after the storm complex formed, a weak Funnel was Reported on the Beaches of Lake Michigan. The First reported one in Three Days.
Afterwards, some of the storms weakened, with some storms staying the same and one particular cell slowly organizing and strengthening.
At 3:00 PM, whilst most of the storms in the Complex had either Weakened or Dissipated, One continued North-West, barely maintaining strength and structural integrity.
And this cell briefly produced a Weak EF0 Tornado East-Southeast of Madison, Wisconsin at about 3:11 PM.
The Storm briefly weakened before Re-strengthening as it began to Enter Sun Prairie, Wisconsin at 4:00 PM, and Spotters began to report an area of Anticyclonic Rotation on the Storm.
And for the next Twenty Minutes to half hour, the storm produced intermittent funnels, before they stopped again.
Finally at just before 5:00 PM, spotters witnessed the Formation of an Anticyclonic Tornado. The was the first time since 2015 that an Anticylonic tornado had formed anywhere in the US.
The Tornado tore through small neighborhoods, causing some damage as it did, and Killing One when it caused destruction in a trailer park.