On Thursday, April 23, 2015 the Milwaukee Brewers, Today’s TMJ4, and Discovery World are once again transforming Miller Park into the largest science classroom in Wisconsin.
At Weather Day you can:
- Meet your favorite Storm Team 4 meteorologists.
- Play team weather trivia.
- Have fun exploring weather science.
- Watch your Milwaukee Brewers take on the Cincinnati Reds.
This year you can also make your own Tornado Hat and learn about the Fujita Scale with Justin Doll from the Kohl’s Design It! Lab. Aisha Rickli-Rahman from Discovery World will demonstrate how wind turbines work. And there will be hands-on demonstrations and activities from the Milwaukee Public Museum, the Mitchell Park Domes, and Ready Wisconsin.
Discovery World’s own Paul Mech will step onto the field at Miller Park with a spectacular, live science demonstration. Paul’s going to make a cloud. A real cloud. A really big cloud. We asked him about it.
Hello, Paul Mech. First off, how do clouds form?
Clouds need three conditions to form in the atmosphere. There has to be enough water vapor because clouds are made of water. There have to be particulates in the air that the water vapor can “grab on to”. The third thing clouds need is a difference in temperature and/or pressure.
I remember a cloud-making thing we did in science class in 5th grade. It went kind of okay. How are you going to make a cloud big enough to be seen by thousands of kids at Miller Park on Weather Day?
I don’t have to bring my own particulates because dust, pollen, and pollution are always floating in the air. Water is easy. I can’t do much about pressure, so I’ll have to create a difference in temperature. That’s the fun part.
And how are you going to do that?
I’m going to pour boiling water into a large bucket of liquid nitrogen.
That sounds hilariously dangerous.
It’s all very safe, mostly.
Wait! Water boils at 212° F. Liquid nitrogen boils at -320°F. That’s a temperature difference of over 500°.
Exactly! And what happens next is awesome. The boiling water cools incredibly quickly. The nitrogen boils and expands rapidly, and it launches all that water and water vapor into the air. The water vapor grabs onto the particulates in the air, and a cloud forms.
A big cloud?
A huge cloud. We’re using a ridiculous amount of liquid nitrogen.
Fantastic. Are you excited for Weather Day?
It’s Wisconsin’s largest science classroom filled with learning and fun. I’m incredibly excited.
Here is Paul Mech making a much smaller cloud on Today’s TMJ4.
To see the largest cloud ever made by a human being (probably), you’ll have to go to Weather Day. You should go anyway. It’s awesome.
Weather Day is sponsored by the Milwaukee Brewers, Today’s TMJ4, Discovery World, the Mitchell Park Domes, the Milwaukee Public Museum, and Ready Wisconsin.