At 8:56 p.m. Eastern Daylight Time Tuesday, Environment Canada has issued a tornado warning for Eastern Ontario. Extra care and attention should be exercised in and around the following localities: Renfrew, Arnprior, Calabogie, Smiths Falls, Perth and Eastern Lanark County. Environment Canada meteorologists are tracking a severe thunderstorm that is possibly producing a tornado. Damaging winds, large hail and locally intense rainfall are also possible.