It has been confirmed: The storm that moved through Rochester on Tuesday included at least one tornado.

Ken Jones, Rochester’s director of the emergency management, said in an email to media that National Weather Service survey teams confirmed that an EF 1 tornado, with 86- to 110-mph winds, moved across Southwest Rochester in the storm. A tornado was not noted by weather radar at the time.

To determine a tornado, NWS sends out its meteorologists to survey the damage. They note the amount and type of damage, whether a tree is snapped off, or blown over, the direction trees fell. If they all fell in one direction, that indicates straight-line winds.

Trees toppled in many directions signal a tornado.

In this case, NWS determined it was a tornado after a visual survey of the area.

As for the coming week, Jones’ six-day outlook includes a low possibility for severe weather.

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