Where does a shelf cloud form?

At the leading edge of a storm's outflow

What pushes under the warm air?

Cool air flowing out of the storm

What happens to the warm air ahead?

It is lifted and condenses into cloud

How is a shelf cloud connected to the storm?

It stays attached to the cloud base

Shelf Cloud Quiz: Storm Fronts and Arcus Clouds

This shelf cloud quiz watches a dramatic wall of cloud roll in ahead of a thunderstorm. Play 10 interactive questions on arcus clouds, the gust front where cool outflow pushes under warm air, a shelf attached to the storm above, sudden gusts and temperature drops, how roll clouds differ, Australia's Morning Glory and what the cloud tells storm watchers.

Start Shelf Cloud Quiz

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Type
Which cloud family does a shelf cloud belong to?
Where
Where does a shelf cloud form?
Outflow
What pushes under the warm air?
Lift
What happens to the warm air ahead?
Attach
How is a shelf cloud connected to the storm?
Wind
What often arrives with a shelf cloud?
Roll
How does a roll cloud differ?
Glory
Where does the Morning Glory roll cloud appear?
Tornado
Is a shelf cloud the same as a tornado?
Look
What does a shelf cloud often look like?

Explanations: answer key for all 10 questions

Q1: Which cloud family does a shelf cloud belong to?
Answer: Arcus clouds
They are low and horizontal.
Q2: Where does a shelf cloud form?
Answer: At the leading edge of a storm's outflow
It marks the gust front.
Q3: What pushes under the warm air?
Answer: Cool air flowing out of the storm
It acts like a wedge.
Q4: What happens to the warm air ahead?
Answer: It is lifted and condenses into cloud
Rising air cools.
Q5: How is a shelf cloud connected to the storm?
Answer: It stays attached to the cloud base
Roll clouds are detached.
Q6: What often arrives with a shelf cloud?
Answer: Sudden strong gusts
Temperatures can drop quickly.
Q7: How does a roll cloud differ?
Answer: It is a detached tube of cloud
It seems to roll along.
Q8: Where does the Morning Glory roll cloud appear?
Answer: Northern Australia
Glider pilots ride it.
Q9: Is a shelf cloud the same as a tornado?
Answer: No
It looks scary but is different.
Q10: What does a shelf cloud often look like?
Answer: A low, wedge-shaped wall
Layers can look like steps.

A Wall of Cloud Before the Storm

A shelf cloud is a type of arcus cloud, a low, horizontal cloud at the leading edge of a thunderstorm's outflow. Cool air rushing out of the storm spreads along the ground and pushes under warmer air like a wedge, forming the gust front.

The warm air is lifted, cools and condenses into a wedge-shaped wall of cloud, often with layers like steps. A shelf cloud stays attached to the storm's cloud base. Sudden strong gusts and a quick temperature drop often arrive as it passes, and rain may follow.

A roll cloud is different, a detached tube of cloud that seems to roll along. Northern Australia's Morning Glory is a famous roll cloud ridden by glider pilots. Shelf clouds look dramatic but are not tornadoes, though they warn storm watchers that strong winds are arriving.

What This Quiz Teaches

Weather fans will enjoy these questions.

What a shelf cloud is
How it forms
What weather it brings
How roll clouds differ
What it means for safety

Did You Know?

Photographers chase them across plains.
They can stretch for many kilometers.
Dust may blow under them.
Boats should seek shelter.
Radar shows the gust front as a thin line.