Eli5 when it’s windy outside why does the water in toilets swish a little bit?

Question

Eli5 when it’s windy outside why does the water in toilets swish a little bit?

In: 1241

Answer 1

I grew up in the southeast and even with vents through the ceilings never experienced this until moving to the Midwest. Like I’ve been through several hurricanes up to and including Cat4 and never noticed the toilet water moving like this until 5 years ago living in the Midwest with crazy gusty winds all moving the same direction. It still creeps me out even knowing what the cause is.