Severe thunderstorm warning

At 10:19 p.m. EDT, Environment Canada meteorologists are tracking a severe thunderstorm capable of producing very strong wind gusts, nickel to ping pong ball size hail and heavy rain.

This line of severe thunderstorms is located from 8 kilometres northeast of Campbells Beach to 70 kilometres southwest of Pelee Island, moving southeast at 70 km/h.

Hazard: 100 km/h wind gusts and nickel size hail.

Locations impacted include:
London, Kitchener, Hamilton, Toronto, Oshawa, St. Thomas, Stratford, Woodstock, Waterloo, Cambridge, Brantford, Guelph, Orangeville, Milton, Burlington, Brampton, Oakville, Mississauga, Vaughan, Newmarket, Richmond Hill and Peterborough.

Power outages are possible.

Take cover immediately, if threatening weather approaches. Heavy downpours can cause flash floods and water pooling on roads. If visibility is reduced while driving, turn on your lights and maintain a safe following distance. Strong wind gusts can toss loose objects, damage weak buildings, break branches off trees and overturn large vehicles. Intense lightning is likely with any thunderstorm that develops. Remember, severe thunderstorms can produce tornadoes.

Severe thunderstorm warnings are issued when imminent or occurring thunderstorms are likely to produce or are producing one or more of the following: large hail, damaging winds, torrential rainfall.

The Office of the Fire Marshal and Emergency Management recommends that you take cover immediately if threatening weather approaches.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@canada.ca or tweet reports using #ONStorm.

For more information: http://www.emergencymanagementontario.ca/english/beprepared/beprepared.html.

Severe thunderstorm warning

At 9:29 p.m. EDT, Environment Canada meteorologists are tracking a severe thunderstorm capable of producing very strong wind gusts, nickel to ping pong ball size hail and heavy rain.

This line of severe thunderstorms is located from Beaverdale to 35 kilometres southwest of Colchester, moving southeast at 70 km/h.

Hazard: 100 km/h wind gusts and nickel size hail.

Locations impacted include:
London, Kitchener, Leamington, Chatham, St. Thomas, Stratford, Woodstock, Mount Forest, Waterloo, Guelph, Orangeville, Petrolia, Parkhill, Rodney, Strathroy, Exeter, Lucan, Mitchell, St. Marys and Listowel.

Power outages are possible.

Take cover immediately, if threatening weather approaches. Heavy downpours can cause flash floods and water pooling on roads. If visibility is reduced while driving, turn on your lights and maintain a safe following distance. Strong wind gusts can toss loose objects, damage weak buildings, break branches off trees and overturn large vehicles. Intense lightning is likely with any thunderstorm that develops. Remember, severe thunderstorms can produce tornadoes.

Severe thunderstorm warnings are issued when imminent or occurring thunderstorms are likely to produce or are producing one or more of the following: large hail, damaging winds, torrential rainfall.

The Office of the Fire Marshal and Emergency Management recommends that you take cover immediately if threatening weather approaches.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@canada.ca or tweet reports using #ONStorm.

For more information: http://www.emergencymanagementontario.ca/english/beprepared/beprepared.html.

Severe thunderstorm watch issued in Chatham-Kent at 2:13 p.m.

Conditions are favourable for the development of dangerous thunderstorms that may be capable of producing damaging wind gusts, damaging hail and heavy rain.

Hazards:
Wind gusts up to 110 km/h
Large hail up to ping pong ball size
Heavy downpours
A tornado is possible

Timing: Late this afternoon and this evening.

Discussion: A line of severe thunderstorms is expected to move eastward across the regions late this afternoon and this evening.

Very large hail can damage property, break windows, dent vehicles and cause serious injury. Very strong wind gusts can damage buildings, down trees and blow large vehicles off the road. Remember, severe thunderstorms can produce tornadoes. Lightning kills and injures Canadians every year. Remember, when thunder roars, go indoors!

Severe thunderstorm watches are issued when atmospheric conditions are favourable for the development of thunderstorms that could produce one or more of the following: large hail, damaging winds, torrential rainfall.

The Office of the Fire Marshal and Emergency Management recommends that you take cover immediately if threatening weather approaches.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@canada.ca or tweet reports using #ONStorm.

For more information: http://www.emergencymanagementontario.ca/english/beprepared/beprepared.html.

• This story will be updated.