Geraldton, ON F0 Tornado of July 23, 1999

Geraldton - Manitouwadge

This tornado touched down at 8:15 pm, shearing the tops off of trees. Witnesses described a funnel cloud, fully condensed to the ground.

Figure 1 depicts the surface observations at 8:00 pm, which shows a low pressure system over northern Manitoba with a low pressure through extending into northwestern Ontario. This trough became the focus for thunderstorms later in the evening hours of July 23rd, which led to this F0 tornado.

Figure 1. Surface analysis at 00Z on July 24, 1999 showing mean sea-level pressure (MSLP) contours, surface observations, fronts and pressure centres (WPC, 2017)

According to Environment and Climate Change Canada (2018), an F0 tornado touched down at 8:15 pm EDT near Geraldton, ON. The path and width of the tornado was not documented by ECCC. The tornado caused no fatalities, injuries or property damage.


NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 00Z Sat Jul 24 1999. Retrieved from:

Environment and Climate Change Canada Data. (2018). Canadian National Tornado Database: Verified Events (1980-2009) – Public. Retrieved from: