40mph winds are effectively the same as driving a car along at 40mph and sticking your hand out of the window. It's strong, but not "hurricane" territory. Anything that's not sensibly stored and tucked away might get blown about.

But it's also worth noting that when they say "47mph wind" they don't (necessarily) mean a constant wind at that strength. Wind usually comes and goes in gusts, and that will be the predicted speed of the gusts at their strongest point. So it might gust up and knock a wheelie bin over, but then ease off again rather than carrying it down the street Wizard of Oz style.