Periods of rain, at times heavy, are expected on Thursday. Some thunderstorm activity is also likely to be associated. Rainfall amounts will be variable, with average amounts in the 20 to 30 mm range. However 40 to 50 mm may be possible in some locales due to very heavy rainfall in thunderstorms. Localized flooding in low-lying areas is possible. Don’t approach washouts near rivers, creeks and culverts. Rainfall Warnings are issued when significant rainfall is expected. Environment Canada meteorologists will update alerts as required, so stay tuned to your local media or Weatheradio. Email reports of severe weather to firstname.lastname@example.org or tweet with the hashtag #ONStorm.