Why does the water in my toilet move when it is very windy

[stephenb]

I went for a pee last night during the severe storm we were having at the time and the water in my loo was moving around quite a bit, any body know why?

 

[h4rri]

I would guess it's either something to do with the barometric pressure moving the body of water or simply the wind whistling around in the drainage system.

 

[hepburn]

Localised storm?

 

[mattyh]

because the wind blows down the pipe outside (I hope it's outside anyway, otherwise you might have a problem ), as there's a vent in the top, which moves the water

 

[Forbiddenbiker]

I agree... High speed wind over drain cover equals low pressure. Which will lower the pressure under drain cover which will cause the pipes to suck.

 

[stephenb]

Blimey that was quick, thanks for the replies guys.

 

[inaneredstripe]

wind? toilet? beans? sorry.
the outside drain does ahve a stack pipe that vents to the air. yup. wind blowing round it creates a slight pressure down the pipe which pushes on the water in the u bend.
hence moviing water du toilet