Sarnia, Ontario, Canada Severe Weather Alertstar_ratehome

Conditions are favourable for the development of squalls with wind gusts up to 45 knots, frequent lightning, hail and poor to very poor visibility in thunderstorms heavy at times.

An area of thunderstorms approaching from Michigan near midnight will cross the regions and track eastward. Damaging hail is possible.

###

Poor to very poor visibility may contribute to voyage delays and make marine navigation hazardous.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

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

Hazards:
Up to 90 km/h wind gusts.
Up to ping pong sized hail possible.
Risk of a tornado.
Torrential downpours.

Timing:
Overnight.

Additional Information:
Strong thunderstorms are expected to push eastward into the region overnight. The risk for a tornado will primarily be for areas near the Michigan border.

Torrential downpours are expected. Please see the special weather statement in effect for more details.

###

Local utility outages are possible.

Strong wind gusts can damage trees, buildings and overturn vehicles. Severe thunderstorm watches are issued when conditions are favourable for the development of thunderstorms capable of producing damaging hail, wind or rain.

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

For more information: https://www.ontario.ca/page/be-prepared-emergency.

Rain, heavy at times, is expected tonight. 

What:
Total rainfall amounts of 30 to 50 mm. Locally higher amounts are possible in thunderstorms.

When:
Beginning tonight and ending Wednesday morning.

Additional information:
Another wave of heavy rain is expected to push into southern Ontario tonight. There remains some uncertainty regarding the total potential rainfall amounts. This next round of rain is associated with a compact low pressure system pushing into southwestern Ontario. A slight deviation in the track of this low pressure system will significantly impact where the heaviest rain sets up.

Rainfall warnings may be required for some locations tonight.

Water will likely pool on roads and in low-lying areas. Don't drive 
through flooded roadways. Avoid low-lying areas.

For information concerning flooding, please consult your local 
Conservation Authority or Ontario Ministry of Natural Resources 
office. Visit https://www.ontario.ca/page/floods for the latest 
details.

###

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