Every day Will Pearson bikes from his home in San Francisco's Marina district to his office in the Financial District. His morning ride along the Embarcadero is pleasant and calm, but he has noticed the wind picks up significantly on his ride home.

"I’ve always wondered why different parts of the day have such different levels of wind," said Pearson.

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Fortunately, it's not too complicated, said meteorologist Jan Null.

Here's the simple explainer from KQED cartoonist Mark Fiore.