How to teach weather fronts

Why this matters

A student can label a cold front on a diagram and still believe the rain comes from the cold air because cold air feels wetter. A forecast built on that idea has a claim but no real evidence or reasoning behind it. On a worksheet the right label hides the wrong idea, and the teacher has to wait for quiz day to find out.

Jayden's chat: will Saturday's game get rained out?

Jayden is a middle schooler who plays travel baseball, and a game of his got rained out last week. He can point to a cold front on a weather map. He thinks cold air brings rain because it holds more water.

The whole class gets the same activity: the same greeting, the same front simulator and the same question about where the rain came from. Each student's chat is their own. Sparky sets the forecast around the student's own plans, and its next message depends on what the student just wrote.

Sparky uses the student's interestSparky sends the student back to a run he already didA right answer gets a harder question

J

Jayden

Interest: Travel baseballStarting point: Thinks cold air brings the rain

Sparky

Hi! I'm Sparky. Today you'll make a forecast: will the weather wreck your plans this weekend? First, what's something you do outside, like a sport, a practice or a trip? And has rain ever cancelled it?

Jayden

I play travel baseball. We got rained out last week and I was so mad

Sparky

Getting rained out is the worst, especially travel ball. Let's figure out why it happens so you can see it coming next time. Run the simulator twice: once with the warm air humidity low, then Reset and push again with it high. Where did the rain form, and which air mass did the water come from?

Jayden

the rain came from the cold air. when the cold front hits it rains because cold air is wetter

Sparky

Good observation on where the rain formed: right above the front. Now look at which air was wetter. Go back to your low humidity run. Did any rain fall? Then keep the warm air humid and drag the cold air humidity all the way down. What happens?

Jayden

it still rained with the cold air at 0%. but when the warm air was dry there was no rain. so the water came from the warm air. it got pushed up and cooled off and made clouds

Sparky

That's it: the warm, humid air got pushed up along the front, cooled as it rose, and its water vapor made clouds and rain. Now use it. The front sweeps in Friday night, and your game is Saturday morning. Will your game get rained out? Answer in three parts: claim, evidence from your simulator runs and this map, and reasoning.

Jayden

Claim: yes the game probably gets rained out. Evidence: in my simulator it only rained when the warm air was humid, and the map says the air where my game is is warm and humid and the cold front is coming. Reasoning: the cold front pushes the warm humid air up, it cools and makes clouds and rain right when the front gets to my field

Understanding check

Claim, evidence and reasoning all line up. One more: what if the warm air ahead of the front were dry? Would your game get rained out then? Same three parts.

Jayden

Claim: no rain, the game is on. Evidence: when I set the warm air to dry in the simulator, the air still went up but no clouds or rain. Reasoning: dry warm air doesnt have enough water to make clouds when it cools, so the front would just make it colder

Sparky

You just worked out why last week's game got rained out. Before the next one, check whether the warm air ahead of the cold front is humid.

Found where the rain came from, then forecast his own game

Jayden thought the rain came from the cold air because that's where the front was when the rain started. Sparky didn't tell him he was wrong. It sent him back to the dry run he had already pushed, where no rain fell, and gave him one more run to try. He found the answer in his own runs, and the same runs became the evidence in his forecast.

Jayden is an example student, and Sparky's replies are shortened.

What Flint did for Jayden

• Sparky built a front simulator before asking anything, so Jayden saw rain form only when the warm air was humid.
• When Jayden said cold air is wetter, Sparky sent him back to his dry-air run instead of giving him the answer.
• Once Jayden explained the rain himself, Sparky drew a forecast map with a cold front reaching his Saturday game.
• After his forecast held up, Sparky asked what would change if the warm air were dry.

A teacher can't do this by hand for 30 students, and Sparky does it in every student's chat.

Who still thinks the cold air brings the rain

When a student gives three wrong answers, Sparky flags them for the teacher under Needs attention while the class is still working. When students finish, Sparky reads every chat and sums up the class on the activity page: what most students understood, which idea came up most, and what to practice next.

Set up the activity for free

The weather fronts activity is in Flint's public library, with Sparky's guidelines, greeting and greeting suggestions already written. Open it, select Use activity to copy it into a free Flint account, and move it to a class. In the activity's Preview tab, select Try session myself to test it as a student before you assign it.

For more science activities, see Flint for science.