From K-QED.

Every day, Will Pearson gets on his bicycle in San Francisco's marina neighborhood

and heads into the financial district for work.

In the mornings it's very calm and pleasant.

Biking along the Embarcadero, such a delightful way to wake up.

But on its way home in the afternoon, things are quite different.

It's very windy. It's not like winds that I'm used to in the Midwest unless it's like a tornado

or something.

He's got to work much harder to pedal his bike through those strong winds.

And I've always wondered why different parts of the day have such different levels of wind.

I'm Olivia Alan Price. This week on Bay Curious, we're answering four of your weather questions, starting with this one from Will. Why is it so windy in the afternoon?

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To find the answer to Will's question, reporter Kelly O'Mara met an ace weatherman.

His name is Jan Null.

Jan Null, certified consulting meteorologist, adjunct professor at San Jose State University.

He says it's not Will's imagination. It is windier in the

afternoons, especially during the late spring and summer.

Air always flows from high pressure to low pressure. And high pressure is most often associated with

cooler air and low pressure is with warmer air because it rises and it becomes lighter,

less dense.

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