Aurora in Thunder bay on August 4, 2025

August 4, 2025

Thunder bay change region

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Probability of aurora in Thunder bay

Probability of aurora as of end of day, August 4, 2025, Thunder bay time

3 % Thunder bay

Aurora intensity index

Auroral intensity index and estimated minimum latitude of auroral observations at zenith as of the end of August 4, 2025, Thunder bay time

Aurora over North America

Changes in the auroral oval on August 4, 2025 in Canada from the beginning to the end of the day, Coordinated Universal Time (UTC)

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Aurora in the northern hemisphere

Changes in the auroral oval on August 4, 2025 in the northern hemisphere from the beginning to the end of the day, Coordinated Universal Time (UTC)

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Probability of aurora in cities of Canada

Estimated probabilities of aurora observations at zenith for cities in Canada as of end of day August 4, 2025.

1 % Ottawa

0 % Toronto

1 % Montreal

0 % Vancouver

2 % Calgary

5 % Edmonton

0 % Hamilton (Canada)

1 % Quebec

4 % Winnipeg

0 % Kitchener

4 % Saskatoon

3 % Red deer

17 % Salluit

20 % Arviat

17 % Yellowknife

5 % Whitehorse

17 % Thompson

2 % Prince george

16 % Rankin Inlet

12 % Iqaluit

14 % Inuvik

5 % Cambridge Bay

Aurora intensity over 2 days

Changes in the auroral intensity index from August 3 to 4, 2025 in the northern hemisphere, Thunder bay time

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