Carp, ON F2 Tornado of August 4, 1994

City of Ottawa

This tornado touched down at around 3:30 pm near Carp, causing extensive damage at area farms. At one that was particularly hard hit, a farmhouse was left pockmarked by flying debris and had windows smashed and large sections of its roof torn off. A neighbouring barn also had portions of its roof ripped off before the structure collapsed entirely. A number of cattle were killed before the tornado reached the Ottawa River. Damage totalled over 2M.

This was one of two tornadoes to touch down in Eastern Ontario on August 4; the other was an F1 at Alexandria. A third tornado also touched down just east of there at Aylmer, Quebec. This more powerful twister was an F3 that damaged and destroyed hundreds of homes through the town.

Figure 1 shows the surface observations at 2:00 pm EDT, which depicts a low pressure on the shores of Georgian Bay with an associated cold front entering eastern Ontario and southern Quebec. This cold front became the focus for intense thunderstorms, which led to several damaging tornadoes across both provinces.

Figure 1. Surface analysis at 18Z on August 4, 1994 showing mean sea-level pressure (MSLP) contours, surface observations, fronts and pressure centres (WPC, 2017).

According to Environment and Climate Change Canada (2018), an F2 tornado touched down at 3:30 pm EDT near Carp, ON. The track and width of the tornado was not documented by ECCC. The tornado caused no fatalities or injuries, but caused $2 million dollars in property damage.


NWS Weather Prediction Center Surface Analysis Archive. (2017). Surface analysis 18Z Thu Aug 4 1994. Retrieved from:

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