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Severe thunderstorm watch in effect (update: upgraded to warning)

Thunderstorms tracking through southwestern Ontario could produce damaging winds and torrential downpours
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WEATHER ALERT
ENVIRONMENT CANADA
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Severe thunderstorm warning issued for:

  • St. Catharines - Grimsby - Northern Niagara Region, Ont. (046710)
  • Niagara Falls - Welland - Southern Niagara Region, Ont. (046720)

Current details:
At 8:02 p.m. EDT, Environment Canada meteorologists are tracking a cluster of severe thunderstorms capable of producing strong wind gusts, pea to dime size hail and heavy rain.

This cluster is producing torrential downpours. 50 mm of rainfall in an hour or less is possible along with wind gusts to 90 km/h.

These thunderstorms are moving east at about 50 km/h.

Heavy downpours can cause flash floods and water pooling on roads. Strong wind gusts can toss loose objects, damage weak buildings, break branches off trees and overturn large vehicles.

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.

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.

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Original alert

Severe thunderstorm watch in effect for:

  • Niagara Falls - Welland - Southern Niagara Region
  • St. Catharines - Grimsby - Northern Niagara Region

Thunderstorms tracking through southwestern Ontario this evening may be capable of producing damaging wind gusts and torrential downpours totaling 50 mm in an hour or less.

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.

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.

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