Summary Rain, heavy at times, will begin this evening and end midday Monday. Total rainfall amounts of 25 to 50 mm are expected. There is also a risk of an isolated thunderstorm this evening or overnight over Southwestern Ontario. Rainfall warnings are issued when 25 mm or more of rain are expected within 24 hours when the ground is frozen or
A cluster of thunderstorms is moving eastwards across southern lower Michigan and is expected to reach Southwestern Ontario around 4 or 5 pm EDT. A few of these thunderstorms may be capable of producing very strong wind gusts, as well as potentially large hail of 2 cm or more. This round of thunderstorms should move past by early evening but more thunderstorms are possible later this evening into the overnight hours. These may be severe as well.
Locally heavy rain is also possible. Intense lightning is likely with any storm that develops. Remember, severe thunderstorms can produce tornadoes. Be prepared for severe weather. Take cover immediately, if threatening weather approaches.
The Office of the Fire Marshal and Emergency Management recommends that you take cover immediately, if threatening weather approaches.
Environment Canada meteorologists will update alerts as required. Please monitor local media or Weatheradio.
Conditions are favourable for the development of dangerous thunderstorms that may be capable of producing torrential rain. Thunderstorms over lower Michigan will track into southwestern Ontario late this afternoon. With a very moist air mass in place over southwestern Ontario, these thunderstorms may be capable of producing torrential rain.
Thunderstorms with heavy downpours possible tonight.
Showers at times heavy with embedded thunderstorms will affect portions of Southwestern Ontario tonight as a strong disturbance approaches from the us Midwest.
Current indications suggest that some areas may see rainfall amounts of 20 to 40 mm by Monday morning with local amounts of near 50 mm quite possible for locales that receive two or three thunderstorms in a row.