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The satellite view—courtesy of Environment and Climate Change Canada—clearly shows where the forest fire smoke is and where the conditions are much better.
Saskatoon was on the wrong side of that line early in the afternoon, but the advisory was lifted at 3:45pm. However, advisories remain in effect for areas in west-central, southwest and south-central Saskatchewan.
Environment Canada meteorologist Terri Lang provides this explanation.
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Lang says it is not easy to forecast forest fire smoke movement because there are many variables.
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