Tree about to bloom

Wednesday Cathy and I walked around Lake Tomahawk. It had been at least a week, and my lungs had only been coughing for a lot of that week. Let's just say it was a good workout for me.

That's my friends Jeff and Diane's house in the background. But I'm mainly interested in identifying the tree. 

There was no wind during our walk, which I appreciated. That evening some rain storms were due to hit us.

It's about to burst into bloom. But Cathy and I had no clue what it is.

Do you know what that tree is?