What is a Squall Line? Squall lines are common during the spring and summer months. But what is a squall line? This video explains the core concepts behind this weather phenomenon. Weather Glossary Severe Weather 1 month ago/ 1 views You may also like 1:00 What is a Microburst? 1 views Weather Glossary 0:40 Scattered vs. Isolated Thunderstorms 6 views Weather Glossary 1:00 What is a Severe Thunderstorm Watch? 2 views Weather Warnings 1:00 What is a Tornado Watch? 1 views Weather Warnings