THUNDER BAY – WEATHER – Alert Ended.
Previously…
A Severe Thunderstorm Watch is now in effect for Thunder Bay, adding urgency to today’s earlier storm forecast.
Environment Canada warns that conditions are ripe for dangerous thunderstorms this morning that may deliver damaging wind gusts, large hail, and heavy rainfall. This is in addition to already elevated heat and humidity levels expected throughout the day.
Weather Alert Summary
⚡ What to Expect
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Hazards:
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Wind gusts up to 90 km/h
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Toonie-sized hail (approx. 2.5 cm diameter)
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Heavy rain leading to localized flooding
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Timing:
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Late morning through early afternoon – watch for sudden weather changes and deteriorating visibility
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Emergency Preparedness
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Secure outdoor furniture, umbrellas, and loose items
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Move indoors immediately when thunder is heard – lightning can strike from 10 km away
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Avoid water activities and seek shelter in a sturdy building
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Be ready for flash flooding, especially in low-lying and urban areas
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Stay tuned to local weather alerts and warnings
Updated Weather Overview
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Morning: Mostly cloudy and humid, conditions deteriorating rapidly
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High: 28 °C | Humidex: 37
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Wind: Becoming southwest 20 km/h gusting to 40, possibly stronger in storms
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UV Index: 6 (High)
Severe thunderstorms are unpredictable. Even if skies appear only partly cloudy, conditions can escalate quickly. Do not wait until it starts to rain—lightning, wind, or hail can strike with little warning.
Weather Trivia
Thunder Bay’s last significant hail event was in June 2021, when quarter-sized hail damaged cars and gardens across parts of the city. Today’s toonie-sized hail risk means roof and vehicle damage is possible—stay under solid shelter.
