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Alerts for: Atikokan - Upsala - Quetico


1:05 PM EDT Thursday 16 September 2021
Severe thunderstorm watch in effect for:

  • Atikokan - Shebandowan - Quetico Park
  • Upsala - Raith

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

Thunderstorms are expected to develop from late afternoon.

These storms are capable of producing strong wind gusts up to 110 km/h, hail with a diameter of 1 to 4 cm and heavy downpours with 20 to 40 mm possible in an hour.
An isolated tornado is also possible.

Large hail can damage property and cause injury. Strong wind gusts can toss loose objects, damage weak buildings, break branches off trees and overturn large vehicles. Remember, severe thunderstorms can produce tornadoes. Heavy downpours can cause flash floods and water pooling on roads. 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 or tweet reports using #ONStorm.

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