North Bay, ON EF0 Tornado of July 15, 2014

North Bay - West Nipissing

The EF0 tornado caused no damage as it briefly passed near the North Bay airport at approximately 8:15 pm. It was witnessed by several area residents, appearing as a whispy white tube beneath a large fluffy wall cloud. Witnesses captured photos and video of the tornado, which exhibited slow but clear rotation.

Video of the tornado forming in North Bay this evening around 8pm

Posted by Jennifer Fonteine-Bowman on Tuesday, July 15, 2014

Initially there was some question as to whether the the rotation could be considered violent, which is a necessary criteria to be classified as a tornado. However, video and radar analysis by Environment Canada officials ultimately led them to conclude that this was indeed an extremely weak tornado.

This was one of two tornadoes to touch down on July 15, 2014. The other:

  • Lake Nipissing (EF0)
Figure 1. Surface analysis at 00Z on July 16, 2014 showing mean sea-level pressure (MSLP) contours, surface observations, fronts and pressure centres (WPC, 2017)

Figure 1 depicts the surface observations at 8:00 pm EDT, which shows an occluding low pressure system near the Ontario/Quebec border and a trough of low pressure near North Bay in central Ontario. A thunderstorm, marked as a red ‘R’, is observed in North Bay at this time. This thunderstorm was responsible for this brief tornado.


NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 00Z Wed Jul 16 2014. Retrieved from: