Why Can a River Be High on a Sunny Day?

What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. Why can a river be high on a sunny day?

The Big Idea

A river can be high on a sunny day because the rain fell far away! A storm in the mountains sends water downstream, and it takes time to travel. So the sky can be blue where you are while the river is still rising.

Rain Upstream

Step one: the rain falls upstream. Upstream means higher up the river, closer to where it starts. A storm over faraway mountains fills the streams that feed the river.

A Slow Journey

Step two: the water travels. River water does not teleport. It flows downhill at a walking or jogging pace. A storm in the mountains may reach a town hours or even days later.

Still Rising

Step three: the river keeps rising. A river can keep rising even after the rain has stopped and the clouds are gone. River watchers check conditions upstream, and kids should stay away from rivers after storms.

A Closer Look

Let's take a closer look! First, a storm drops rain far upstream. The water flows along a long river. Together it makes a flood wave that slowly moves. Later it reaches the town below, even under a sunny sky.

Quick Facts

Quick facts! A flood wave can take days to travel down a long river. Big rivers drain huge areas, so rain from far away adds up. That is why weather where you stand can be fooling you. Stay back from high water, and stay with a grown-up.

Think Like a Scientist

Now, think like a scientist! Pour a cup of water at one end of a long tray. Time how long it takes to reach the other end. Imagine that trip taking days on a real river. Then share your time with a grown-up!

Outro

Rain upstream can raise a river downstream. Science is amazing! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!